Bioaerosol

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Bioaerosols (short for biological aerosols) are a subcategory of particles released from terrestrial and marine ecosystems into the atmosphere. They consist of both living and non-living components, such as fungi, pollen, bacteria and viruses. [1] Common sources of bioaerosols include soil, water, and sewage.

Contents

Bioaerosols are typically introduced into the air via wind turbulence over a surface. Once in the atmosphere, they can be transported locally or globally: common wind patterns/strengths are responsible for local dispersal, while tropical storms and dust plumes can move bioaerosols between continents. [2] Over ocean surfaces, bioaerosols are generated via sea spray and bubbles.

Bioaerosols can transmit microbial pathogens, endotoxins, and allergens to which humans are sensitive. A well-known case was the meningococcal meningitis outbreak in sub-Saharan Africa, which was linked to dust storms during dry seasons. Other outbreaks linked to dust events including Mycoplasma pneumonia and tuberculosis. [2]

Another instance was an increase in human respiratory problems in the Caribbean that may have been caused by traces of heavy metals, microorganism bioaerosols, and pesticides transported via dust clouds passing over the Atlantic Ocean.

Common bioaerosol isolated from indoor environments Common Bioaerosol Isolated From Indoor Environments.JPG
Common bioaerosol isolated from indoor environments

Background

Charles Darwin was the first to observe the transport of dust particles [3] but Louis Pasteur was the first to research microbes and their activity within the air. Prior to Pasteur’s work, laboratory cultures were used to grow and isolate different bioaerosols.

Since not all microbes can be cultured, many were undetected before the development of DNA-based tools. Pasteur also developed experimental procedures for sampling bioaerosols and showed that more microbial activity occurred at lower altitudes and decreased at higher altitudes. [2]

Types of bioaerosols

Bioaerosols include fungi, bacteria, viruses, and pollen. Their concentrations are greatest in the planetary boundary layer (PBL) and decrease with altitude. Survival rate of bioaerosols depends on a number of biotic and abiotic factors which include climatic conditions, ultraviolet (UV) light, temperature and humidity, as well as resources present within dust or clouds. [4]

Bioaerosols found over marine environments primarily consist of bacteria, while those found over terrestrial environments are rich in bacteria, fungi and pollen. [5] The dominance of particular bacteria and their nutrient sources are subject to change according to time and location. [2]

Bioaerosols can range in size from 10 nanometer virus particles to 100 micrometers pollen grains. [6] Pollen grains are the largest bioaerosols and are less likely to remain suspended in the air over a long period of time due to their weight. [1]

Consequently, pollen particle concentration decreases more rapidly with height than smaller bioaerosols such as bacteria, fungi and possibly viruses, which may be able to survive in the upper troposphere. At present, there is little research on the specific altitude tolerance of different bioaerosols. However, scientists believe that atmospheric turbulence impacts where different bioaerosols may be found. [5]

Fungi

Fungal cells usually die when they travel through the atmosphere due to the desiccating effects of higher altitudes. However, some particularly resilient fungal bioaerosols have been shown to survive in atmospheric transport despite exposure to severe UV light conditions. [7] Although bioaerosol levels of fungal spores increase in higher humidity conditions, they can also be active in low humidity conditions and in most temperature ranges. Certain fungal bioaerosols even increase at relatively low levels of humidity.[ citation needed ]

Bacteria

Unlike other bioaerosols, bacteria are able to complete full reproductive cycles within the days or weeks that they survive in the atmosphere, making them a major component of the air biota ecosystem. These reproductive cycles support a currently unproven theory that bacteria bioaerosols form communities in an atmospheric ecosystem. [2] The survival of bacteria depends on water droplets from fog and clouds that provide bacteria with nutrients and protection from UV light. [5] The four known bacterial groupings that are abundant in aeromicrobial environments around the world include Bacillota, Actinomycetota, Pseudomonadota, and Bacteroidota. [8]

Viruses

The air transports viruses and other pathogens. Since viruses are smaller than other bioaerosols, they have the potential to travel further distances. In one simulation, a virus and a fungal spore were simultaneously released from the top of a building; the spore traveled only 150 meters while the virus traveled almost 200,000 horizontal kilometers. [5]

In one study, aerosols (<5 μm) containing SARS-CoV-1 and SARS-CoV-2 were generated by an atomizer and fed into a Goldberg drum to create an aerosolized environment. The inoculum yielded cycle thresholds between 20 and 22, similar to those observed in human upper and lower respiratory tract samples. SARS-CoV-2 remained viable in aerosols for 3 hours, with a decrease in infection titre similar to SARS-CoV-1. The half-life of both viruses in aerosols was 1.1 to 1.2 hours on average. The results suggest that the transmission of both viruses by aerosols is plausible, as they can remain viable and infectious in suspended aerosols for hours and on surfaces for up to days. [9]

Pollen

Despite being larger and heavier than other bioaerosols, some studies show that pollen can be transported thousands of kilometers. [5] They are a major source of wind-dispersed allergens, coming particularly from seasonal releases from grasses and trees. [1] Tracking distance, transport, resources, and deposition of pollen to terrestrial and marine environments are useful for interpreting pollen records. [1]

Collection

The main tools used to collect bioaerosols are collection plates, electrostatic collectors, mass spectrometers, and impactors, other methods are used but are more experimental in nature. [8] Polycarbonate (PC) filters have had the most accurate bacterial sampling success when compared to other PC filter options. [10]

Single-stage impactors

To collect bioaerosols falling within a specific size range, impactors can be stacked to capture the variation of particulate matter (PM). For example, a PM10 filter lets smaller sizes pass through. This is similar to the size of a human hair. Particulates are deposited onto the slides, agar plates, or tape at the base of the impactor. The Hirst spore trap samples at 10 liters/minute (LPM) and has a wind vane to always sample in the direction of wind flow. Collected particles are impacted onto a vertical glass slide greased with petroleum.

Variations such as the 7-day recording volumetric spore trap have been designed for continuous sampling using a slowly rotating drum that deposits impacted material onto a coated plastic tape. [11] The airborne bacteria sampler can sample at rates up to 700 LPM, allowing for large samples to be collected in a short sampling time. Biological material is impacted and deposited onto an agar lined Petri dish, allowing cultures to develop. [12]

Cascade impactors

Similar to single-stage impactors in collection methods, cascade impactors have multiple size cuts (PM10, PM2.5), allowing for bioaerosols to separate according to size. Separating biological material by aerodynamic diameter is useful due to size ranges being dominated by specific types of organisms (bacteria exist range from 1–20 micrometers and pollen from 10–100 micrometers). The Andersen line of cascade impactors are most widely used to test air particles. [13]

Cyclones

A cyclone sampler consists of a circular chamber with the aerosol stream entering through one or more tangential nozzles. Like an impactor, a cyclone sampler depends upon the inertia of the particle to cause it to deposit on the sampler wall as the air stream curves around inside the chamber. Also like an impactor, the collection efficiency depends upon the flow rate. Cyclones are less prone to particle bounce than impactors and can collect larger quantities of material. They also may provide a more gentle collection than impactors, which can improve the recovery of viable microorganisms. However, cyclones tend to have collection efficiency curves that are less sharp than impactors, and it is simpler to design a compact cascade impactor compared to a cascade of cyclone samplers. [14]

Impingers

Instead of collecting onto a greased substrate or agar plate, impingers have been developed to impact bioaerosols into liquids, such as deionized water or phosphate buffer solution. Collection efficiencies of impingers are shown by Ehrlich et al. (1966) to be generally higher than similar single stage impactor designs. Commercially available impingers include the AGI-30 (Ace Glass Inc.) and Biosampler (SKC, Inc).

Electrostatic precipitators

Electrostatic precipitators, ESPs, have recently gained renewed interest [15] for bioaerosol sampling due to their highly efficient particle removal efficiencies and gentler sampling method as compared with impinging. ESPs charge and remove incoming aerosol particles from an air stream by employing a non-uniform electrostatic field between two electrodes, and a high field strength. This creates a region of high density ions, a corona discharge, which charges incoming aerosol droplets, and the electric field deposits the charges particles onto a collection surface.

Since biological particles are typically analysed using liquid-based assays (PCR, immunoassays, viability assay) it is preferable to sample directly into a liquid volume for downstream analysis. For example, Pardon et al. [16] show sampling of aerosols down to a microfluidic air-liquid interface, and Ladhani et al., [17] show sampling of airborne Influenza down to a small liquid droplet. The use of low-volume liquids is ideal for minimising sample dilution, and has the potential to be couple to lab-on-chip technologies for rapid point-of-care analysis.

Filters

Filters are often used to collect bioaerosols because of their simplicity and low cost. Filter collection is especially useful for personal bioaerosol sampling since they are light and unobtrusive. Filters can be preceded by a size-selective inlet, such as a cyclone or impactor, to remove larger particles and provide size-classification of the bioaerosol particles. [14] Aerosol filters are often described using the term "pore size" or "equivalent pore diameter". Note that the filter pore size does NOT indicate the minimum particle size that will be collected by the filter; in fact, aerosol filters generally will collect particles much smaller than the nominal pore size. [18]

Transport mechanisms

Ejection of bioaerosols into the atmosphere

Bioaerosols are typically introduced into the air via wind turbulence over a surface. Once airborne they typically remain in the planetary boundary layer (PBL), but in some cases reach the upper troposphere and stratosphere. [19] Once in the atmosphere, they can be transported locally or globally: common wind patterns/strengths are responsible for local dispersal, while tropical storms and dust plumes can move bioaerosols between continents. [2] Over ocean surfaces, bioaerosols are generated via sea spray and bubbles. [5]

Small scale transport via clouds

Knowledge of bioaerosols has shaped our understanding of microorganisms and the differentiation between microbes, including airborne pathogens. In the 1970s, a breakthrough occurred in atmospheric physics and microbiology when ice nucleating bacteria were identified. [20]

The highest concentration of bioaerosols is near the Earth’s surface in the PBL. Here wind turbulence causes vertical mixing, bringing particles from the ground into the atmosphere. Bioaerosols introduced to the atmosphere can form clouds, which are then blown to other geographic locations and precipitate out as rain, hail, or snow. [2] Increased levels of bioaerosols have been observed in rain forests during and after rain events. Bacteria and phytoplankton from marine environments have been linked to cloud formation. [1]

However, for this same reason, bioaerosols cannot be transported long distances in the PBL since the clouds will eventually precipitate them out. Furthermore, it would take additional turbulence or convection at the upper limits of the PBL to inject bioaerosols into the troposphere where they may transported larger distances as part of tropospheric flow. This limits the concentration of bioaerosols at these altitudes. [1]

Cloud droplets, ice crystals, and precipitation use bioaerosols as a nucleus where water or crystals can form or hold onto their surface. These interactions show that air particles can change the hydrological cycle, weather conditions, and weathering around the world. Those changes can lead to effects such as desertification which is magnified by climate shifts. Bioaerosols also intermix when pristine air and smog meet, changing visibility and/or air quality.

Large scale transport via dust plumes

Satellite images show that storms over Australian, African, and Asian deserts create dust plumes which can carry dust to altitudes of over 5 kilometers above the Earth's surface. This mechanism transports the material thousands of kilometers away, even moving it between continents. Multiple studies have supported the theory that bioaerosols can be carried along with dust. [21] [22] One study concluded that a type of airborne bacteria present in a particular desert dust was found at a site 1,000 kilometers downwind. [2]

Possible global scale highways for bioaerosols in dust include:

Community dispersal

Bioaerosol transport and distribution is not consistent around the globe. While bioaerosols may travel thousands of kilometers before deposition, their ultimate distance of travel and direction is dependent on meteorological, physical, and chemical factors. The branch of biology that studies the dispersal of these particles is called Aerobiology. One study generated an airborne bacteria/fungi map of the United States from observational measurements, resulting community profiles of these bioaerosols were connected to soil pH, mean annual precipitation, net primary productivity, and mean annual temperature, among other factors. [23]

Biogeochemical impacts

Bioaerosols impact a variety of biogeochemical systems on earth including, but not limited to atmospheric, terrestrial, and marine ecosystems. As long-standing as these relationships are, the topic of bioaerosols is not very well-known. [24] [25] Bioaerosols can affect organisms in a multitude of ways including influencing the health of living organisms through allergies, disorders, and disease. Additionally, the distribution of pollen and spore bioaerosols contribute to the genetic diversity of organisms across multiple habitats. [1]

Cloud formation

A variety of bioaerosols may contribute to cloud condensation nuclei or cloud ice nuclei, possible bioaerosol components are living or dead cells, cell fragments, hyphae, pollen, or spores. [1] Cloud formation and precipitation are key features of many hydrologic cycles to which ecosystems are tied. In addition, global cloud cover is a significant factor in the overall radiation budget and therefore, temperature of the Earth.

Bioaerosols make up a small fraction of the total cloud condensation nuclei in the atmosphere (between 0.001% and 0.01%) so their global impact (i.e. radiation budget) is questionable. However, there are specific cases where bioaerosols may form a significant fraction of the clouds in an area. These include:

The collection of bioaerosol particles on a surface is called deposition. The removal of these particles from the atmosphere affects human health in regard to air quality and respiratory systems. [1]

Alpine lakes in Spain

Alpine lakes located in the Central Pyrenees region of northeast Spain are unaffected by anthropogenic factors making these oligotrophic lakes ideal indicators for sediment input and environmental change. Dissolved organic matter and nutrients from dust transport can aid bacteria with growth and production in low nutrient waters. Within the collected samples of one study, a high diversity of airborne microorganisms were detected and had strong similarities to Mauritian soils despite Saharan dust storms occurring at the time of detection. [26]

Affected ocean species

The types and sizes of bioaerosols vary in marine environments and occur largely because of wet-discharges caused by changes in osmotic pressure or surface tension. Some types of marine originated bioaerosols excrete dry-discharges of fungal spores that are transported by the wind. [1]

One instance of impact on marine species was the 1983 die off of Caribbean sea fans and sea urchins that correlated with dust storms originating in Africa. This correlation was determined by the work of microbiologists and a Total Ozone Mapping Spectrometer, which identified bacteria, viral, and fungal bioaerosols in the dust clouds that were tracked over the Atlantic Ocean. [27] Another instance in of this occurred in 1997 when El Niño possibly impacted seasonal trade wind patterns from Africa to Barbados, resulting in similar die offs. Modeling instances like these can contribute to more accurate predictions of future events. [28]

Spread of diseases

The aerosolization of bacteria in dust contributes heavily to the transport of bacterial pathogens. A well-known case of disease outbreak by bioaerosol was the meningococcal meningitis outbreak in sub-Saharan Africa, which was linked to dust storms during dry seasons.

Other outbreaks have been reportedly linked to dust events including Mycoplasma pneumonia and tuberculosis. [2] Another instance of bioaerosol-spread health issues was an increase in human respiratory problems for Caribbean-region residents that may have been caused by traces of heavy metals, microorganism bioaerosols, and pesticides transported via dust clouds passing over the Atlantic Ocean. [27] [29]

Common sources of bioaerosols include soil, water, and sewage. Bioaerosols can transmit microbial pathogens, endotoxins, and allergens [30] and can excrete both endotoxins and exotoxins. Exotoxins can be particularly dangerous when transported through the air and distribute pathogens to which humans are sensitive. Cyanobacteria are particularly prolific in their pathogen distribution and are abundant in both terrestrial and aquatic environments. [1]

Future research

The potential role of bioaerosols in climate change offers an abundance of research opportunities. Specific areas of study include monitoring bioaerosol impacts on different ecosystems and using meteorological data to forecast ecosystem changes. [5] Determining global interactions is possible through methods like collecting air samples, DNA extraction from bioaerosols, and PCR amplification. [21]

Developing more efficient modelling systems will reduce the spread of human disease and benefit economic and ecologic factors. [2] An atmospheric modeling tool called the Atmospheric Dispersion Modelling System (ADMS 3) is currently in use for this purpose. The ADMS 3 uses computational fluid dynamics (CFD) to locate potential problem areas, minimizing the spread of harmful bioaerosol pathogens include tracking occurrences. [2]

Agroecosystems have an array of potential future research avenues within bioaerosols. Identification of deteriorated soils may identify sources of plant or animal pathogens.

See also

Related Research Articles

<span class="mw-page-title-main">Plankton</span> Organisms living in water or air that are drifters on the current or wind

Plankton are the diverse collection of organisms that drift in water but are unable to actively propel themselves against currents. The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish, and baleen whales.

<span class="mw-page-title-main">Aerosol</span> Suspension of fine solid particles or liquid droplets in a gas

An aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. Aerosols can be generated from natural or human causes. The term aerosol commonly refers to the mixture of particulates in air, and not to the particulate matter alone. Examples of natural aerosols are fog, mist or dust. Examples of human caused aerosols include particulate air pollutants, mist from the discharge at hydroelectric dams, irrigation mist, perfume from atomizers, smoke, dust, sprayed pesticides, and medical treatments for respiratory illnesses.

<span class="mw-page-title-main">Dust storm</span> Meteorological phenomenon common in arid and semi-arid regions

A dust storm, also called a sandstorm, is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Fine particles are transported by saltation and suspension, a process that moves soil from one place and deposits it in another.

<span class="mw-page-title-main">Aerobiology</span> Study of airborne organisms

Aerobiology is a branch of biology that studies the passive transport of organic particles, such as bacteria, fungal spores, very small insects, pollen grains and viruses. Aerobiologists have traditionally been involved in the measurement and reporting of airborne pollen and fungal spores as a service to those with allergies. However, aerobiology is a varied field, relating to environmental science, plant science, meteorology, phenology, and climate change.

<span class="mw-page-title-main">Dust</span> Small particles in the air and settling onto surfaces

Dust is made of fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind, volcanic eruptions, and pollution.

<span class="mw-page-title-main">HEPA</span> Efficiency standard of air filters

HEPA filter, also known as a high-efficiency particulate arresting filter, is an efficiency standard of air filters.

<span class="mw-page-title-main">Aeroplankton</span> Tiny lifeforms floating and drifting in the air, carried by the wind

Aeroplankton are tiny lifeforms that float and drift in the air, carried by wind. Most of the living things that make up aeroplankton are very small to microscopic in size, and many can be difficult to identify because of their tiny size. Scientists collect them for study in traps and sweep nets from aircraft, kites or balloons. The study of the dispersion of these particles is called aerobiology.

<span class="mw-page-title-main">Sea spray</span> Sea water particles that are formed directly from the ocean

Sea spray consists of aerosol particles formed from the ocean, primarily by ejection into Earth's atmosphere through bursting bubbles at the air-sea interface Sea spray contains both organic matter and inorganic salts that form sea salt aerosol (SSA). SSA has the ability to form cloud condensation nuclei (CCN) and remove anthropogenic aerosol pollutants from the atmosphere. Coarse sea spray has also been found to inhibit the development of lightning in storm clouds.

<span class="mw-page-title-main">Sea surface microlayer</span> Boundary layer where all exchange occurs between the atmosphere and the ocean

The sea surface microlayer (SML) is the boundary interface between the atmosphere and ocean, covering about 70% of Earth's surface. With an operationally defined thickness between 1 and 1,000 μm (1.0 mm), the SML has physicochemical and biological properties that are measurably distinct from underlying waters. Recent studies now indicate that the SML covers the ocean to a significant extent, and evidence shows that it is an aggregate-enriched biofilm environment with distinct microbial communities. Because of its unique position at the air-sea interface, the SML is central to a range of global marine biogeochemical and climate-related processes.

Aerobiological engineering is the science of designing buildings and systems to control airborne pathogens and allergens in indoor environments. The most-common environments include commercial buildings, residences and hospitals. This field of study is important because controlled indoor climates generally tend to favor the survival and transmission of contagious human pathogens as well as certain kinds of fungi and bacteria.

<span class="mw-page-title-main">Airborne transmission</span> Disease transmission by airborne particles

Airborne transmission or aerosol transmission is transmission of an infectious disease through small particles suspended in the air. Infectious diseases capable of airborne transmission include many of considerable importance both in human and veterinary medicine. The relevant infectious agent may be viruses, bacteria, or fungi, and they may be spread through breathing, talking, coughing, sneezing, raising of dust, spraying of liquids, flushing toilets, or any activities which generate aerosol particles or droplets.

Indoor bioaerosol is bioaerosol in an indoor environment. Bioaerosols are natural or artificial particles of biological origin suspended in the air. These particles are also referred to as organic dust. Bioaerosols may consist of bacteria, fungi, viruses, microbial toxins, pollen, plant fibers, etc. Size of bioaerosol particles varies from below 1 μm to 100 μm in aerodynamic diameter; viable bioaerosol particles can be suspended in air as single cells or aggregates of microorganism as small as 1–10 μm in size. Since bioaerosols are potentially related to various human health effects and the indoor environment provides a unique exposure situation, concerns about indoor bioaerosols have increased over the last decade.

<span class="mw-page-title-main">Aerosol mass spectrometry</span> Application of mass spectrometry to aerosol particles

Aerosol mass spectrometry is the application of mass spectrometry to the analysis of the composition of aerosol particles. Aerosol particles are defined as solid and liquid particles suspended in a gas (air), with size range of 3 nm to 100 μm in diameter and are produced from natural and anthropogenic sources, through a variety of different processes that include wind-blown suspension and combustion of fossil fuels and biomass. Analysis of these particles is important owing to their major impacts on global climate change, visibility, regional air pollution and human health. Aerosols are very complex in structure, can contain thousands of different chemical compounds within a single particle, and need to be analysed for both size and chemical composition, in real-time or off-line applications.

<span class="mw-page-title-main">Respiratory droplet</span> Type of particle formed by breathing

A respiratory droplet is a small aqueous droplet produced by exhalation, consisting of saliva or mucus and other matter derived from respiratory tract surfaces. Respiratory droplets are produced naturally as a result of breathing, speaking, sneezing, coughing, or vomiting, so they are always present in our breath, but speaking and coughing increase their number.

A toilet plume is the cloud like dispersal of microscopic sewage particles & water vapor as a result of flushing a toilet. Day to day use of a toilet by healthy individuals is considered to be of a lower health risk. However this dynamic rapidly changes if an individual is fighting an illness and currently shedding out large quantities of an infectious virulent pathogen in their urine, feces or vomitus. There is evidence that specific pathogens such as norovirus or SARS coronavirus could potentially be spread by toilet aerosols, but as of 2015 no direct experimental studies had refuted actual disease transmission from toilet aerosols. It has been hypothesized that dispersal of pathogens may be reduced by closing the toilet lid before flushing, and by using toilets with lower flush energy. 2024 Science empirically built on to this theory, by illustrating that the viruses that toilet plume contains still spreads out the gaps in the seat onto the walls and concentrating on the surrounding floors.

Kimberly A. Prather is an American atmospheric chemist. She is a distinguished chair in atmospheric chemistry and a distinguished professor at the Scripps Institution of Oceanography and department of chemistry and biochemistry at UC San Diego. Her work focuses on how humans are influencing the atmosphere and climate. In 2019, she was elected a member of the National Academy of Engineering for technologies that transformed understanding of aerosols and their impacts on air quality, climate, and human health. In 2020, she was elected as a member of the National Academy of Sciences. She is also an elected Fellow of the American Philosophical Society, American Geophysical Union, the American Association for the Advancement of Science, American Philosophical Society, and the American Academy of Arts and Sciences.

<span class="mw-page-title-main">North Atlantic Aerosols and Marine Ecosystems Study</span>

The North Atlantic Aerosols and Marine Ecosystems Study (NAAMES) was a five-year scientific research program that investigated aspects of phytoplankton dynamics in ocean ecosystems, and how such dynamics influence atmospheric aerosols, clouds, and climate. The study focused on the sub-arctic region of the North Atlantic Ocean, which is the site of one of Earth's largest recurring phytoplankton blooms. The long history of research in this location, as well as relative ease of accessibility, made the North Atlantic an ideal location to test prevailing scientific hypotheses in an effort to better understand the role of phytoplankton aerosol emissions on Earth's energy budget.

<span class="mw-page-title-main">Saharan dust</span> Wind-borne mineral dust from the Sahara

Saharan dust is an aeolian mineral dust from the Sahara, the largest hot desert in the world. The desert spans just over 9 million square kilometers, from the Atlantic Ocean to the Red Sea, from the Mediterranean Sea to the Niger River valley and the Sudan region in the south.

Particulate pollution is pollution of an environment that consists of particles suspended in some medium. There are three primary forms: atmospheric particulate matter, marine debris, and space debris. Some particles are released directly from a specific source, while others form in chemical reactions in the atmosphere. Particulate pollution can be derived from either natural sources or anthropogenic processes.

<span class="mw-page-title-main">Andersen sampler</span> A type of cascade impactor that measures viable bioaerosols

An Andersen sampler or Andersen impactor is a cascade impactor used to determine the amount of viable pathogens in a given area, in particular bacteria and fungi. Unlike real-time electronic particle counters, the Andersen sampler imparts pathogens on petri dishes, which require incubation. Thus, calculation of the contaminated air requires working backwards from the resulting pathogen growth in each dish.

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  17. ↑ Ladhani, Laila; Pardon, Gaspard; Meeuws, Hanne; Wesenbeeck, Liesbeth van; Schmidt, Kristiane; Stuyver, Lieven; Wijngaart, Wouter van der (2017-03-28). "Sampling and detection of airborne influenza virus towards point-of-care applications". PLOS ONE. 12 (3): e0174314. Bibcode:2017PLoSO..1274314L. doi: 10.1371/journal.pone.0174314 . ISSN   1932-6203. PMC   5369763 . PMID   28350811.
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  20. ↑ Christner, Brent C. (2012). "Cloudy with a Chance of Microbes: Terrestrial microbes swept into clouds can catalyze the freezing of water and may influence precipitation on a global scale". Microbe Magazine. 7 (2): 70–75. doi:10.1128/MICROBE.7.70.1.
  21. 1 2 Smith, David J.; Timonen, Hilkka J.; Jaffe, Daniel A.; Griffin, Dale W; Birmele, Michele N.; Perry, Kevin D; Ward, Peter D.; Roberts, Michael S. (2013). "Intercontinental Dispersal of Bacteria and Archaea by Transpacific Winds". Applied and Environmental Microbiology. 79 (4): 1134–1139. Bibcode:2013ApEnM..79.1134S. doi:10.1128/aem.03029-12. PMC   3568602 . PMID   23220959.
  22. 1 2 Kellogg, Christina A.; Griffin, Dale W. (2006). "Aerobiology and the global transport of desert dust". Trends in Ecology & Evolution. 21 (11): 638–644. Bibcode:2006TEcoE..21..638K. doi:10.1016/j.tree.2006.07.004. PMID   16843565.
  23. ↑ Barberán, Albert; Ladau, Joshua; Leff, Jonathan W.; Pollard, Katherine S.; Menninger, Holly L.; Dunn, Robert R.; Fierer, Noah (2015-05-05). "Continental-scale distributions of dust-associated bacteria and fungi". Proceedings of the National Academy of Sciences of the United States of America. 112 (18): 5756–5761. Bibcode:2015PNAS..112.5756B. doi: 10.1073/pnas.1420815112 . ISSN   1091-6490. PMC   4426398 . PMID   25902536.
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  27. 1 2 J., Schmidt, Laurie (2001-05-18). "When the Dust Settles : Feature Articles". earthobservatory.nasa.gov.{{cite web}}: CS1 maint: multiple names: authors list (link)
  28. ↑ Prospero, Joseph M.; Blades, Edmund; Mathison, George; Naidu, Raana (2005). "Interhemispheric transport of viable fungi and bacteria from Africa to the Caribbean with soil dust" (PDF). Aerobiologia. 21 (1): 1–19. Bibcode:2005Aerob..21....1P. doi:10.1007/s10453-004-5872-7. S2CID   16644704.
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