Helena Joyce
Suspended matter pollution, or suspended particulate matter, is a type of air pollution that refers to a mixture of solid particles and liquid droplets floating in the air or suspended in a liquid medium. These particles are often released into the atmosphere through combustion processes, industrial activities, or natural sources. They can be emitted directly from sources such as construction sites, unpaved roads, fields, smokestacks, or fires, or formed when gases react in the air. Suspended particulate matter can include pollutants such as soot, dust, dirt, and smoke, as well as toxic pollutants and metals. It poses risks to human health, particularly respiratory health, and can also have negative impacts on the environment, such as coral reef ecosystems.
| Characteristics | Values |
|---|---|
| Definition | Particulate matter (PM) refers to a mixture of solid particles and liquid droplets found in the air. |
| Other Names | Particle pollution, suspended particulate matter (SPM), dust, atmospheric aerosol. |
| Composition | Lithogenic material (quartz, feldspars, hydrous aluminium silicate muds), iron and manganese oxides, colloidal materials (inorganic oxides of aluminium, iron, manganese, and silicon; humic substances; polysaccharides, carbonates, muds, and organisms), soot, smoke, dirt, dust, microplastics, plastic rubber waste, organic matter, lead, and other pollutants. |
| Size | Particles can range from larger than 0.45 μm to 10 μm or larger in diameter. Particles smaller than 2.5 μm in diameter (PM2.5) are considered fine particles and pose the greatest risk to health. |
| Sources | Construction sites, unpaved roads, fields, smokestacks, forest fires, industrial activities, combustion processes, vehicle use, and other natural sources. |
| Effects | Suspended matter pollution can cause serious health problems, including respiratory diseases, acute respiratory distress, asthma, chronic obstructive pulmonary disease, and lung cancer. It can also reduce visibility (haze) and negatively impact the environment, such as increasing turbidity in coral reefs and interfering with the feeding habits of coral polyps. |
| Regulations | The US EPA regulates inhalable particles and has developed rules to reduce emissions of pollutants that form PM, helping state and local governments meet national air quality standards. The ICPR drafted a Sediment Management Plan in 2009 to reduce the pollutant load of suspended matter in the Rhine. |
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What You'll Learn
- Particulate matter (PM) is a mix of solid and liquid particles in the air
- Sources of PM include combustion, industrial activities, and natural sources
- Suspended solids include organic matter, plastic waste, and sediments
- Health risks of PM include respiratory diseases and cardiovascular problems
- Regulations and monitoring systems are in place to reduce and manage PM pollution
Particulate matter (PM) is a mix of solid and liquid particles in the air
Particulate matter (PM) is a term used to describe a mixture of solid particles and liquid droplets found in the air. These particles are often released into the atmosphere through combustion processes, industrial activities, or natural sources.
PM is one of the six criteria air pollutants identified by the US EPA, which stands for the United States Environmental Protection Agency. The EPA has developed an Air Quality Index (AQI) to inform the public about the level of outdoor air pollution and associated health risks.
PM can be divided into two main groups based on size: large particles for inhalation and smaller particles. Large particles, or PM10, have a diameter of 2.5 to 10 microns and can be found near dusty roads and industrial plants. Smaller particles, or PM2.5, have diameters of 2.5 micrometers or less and can be emitted directly from sources such as forest fires or formed in the air when gases from power plants, industries, and automobiles react.
The health risks associated with PM pollution are significant. Particles less than 10 micrometers in diameter can penetrate deep into the lungs, and particles less than 2.5 micrometers in diameter can even enter the bloodstream. These fine particles have been linked to various respiratory diseases, including acute respiratory distress, asthma, chronic obstructive pulmonary disease, and lung cancer. They are also the main cause of reduced visibility (haze) in many parts of the world.
Suspended particulate matter specifically refers to solid particles suspended in a liquid medium, typically with sizes larger than 0.45 μm. This can include organic matter, plastic waste, and sedimentation that finds its way into ecosystems, such as reefs, and poses health threats to the organisms within them.
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Sources of PM include combustion, industrial activities, and natural sources
Particulate matter (PM) is a mix of solid and liquid particles in the air. PM is often divided into two main groups based on size: PM10 and PM2.5. PM10 refers to particles with a diameter of 2.5 to 10 microns, while PM2.5 refers to particles with diameters of 2.5 micrometres and smaller.
PM10 particles are inhalable and can be harmful to human health. Sources of PM10 include dust from construction sites, unpaved roads, fields, smokestacks, and fires. They can also come from industrial sources, wind-blown dust from open lands, pollen, and fragments of bacteria.
PM2.5 particles pose a greater risk to human health and are the main cause of reduced visibility (haze) in some regions. These particles can be emitted directly from sources such as forest fires or formed in the atmosphere through chemical reactions.
Combustion
The combustion of gasoline, oil, diesel fuel, or wood produces a significant amount of PM2.5 and PM10 pollution. Incomplete combustion of fossil fuels, biofuels, and biomass results in the emission of black carbon, a major component of PM2.5. Black carbon is also referred to as soot and is emitted from both anthropogenic and natural sources, such as wildfires.
Combustion processes in transportation (e.g., vehicles, aviation, shipping), industrial facilities, power plants, and residential heating contribute to the formation of ultrafine particles (UFP), which have diameters of less than or equal to 0.1 micrometres.
Household activities, such as cooking, heating with dirty technologies, and lighting with kerosene, also emit harmful pollutants that contribute to indoor particulate matter.
Industrial Activities
Industrial processes, including high-temperature combustion, contribute to ambient air pollution. Power-generating facilities, industries, and motor vehicle exhaust release pollutants such as nitrogen oxides (NOx) and sulfur dioxide (SO2), which then react in the atmosphere to form particulate matter.
Natural Sources
Natural sources of particulate matter include wildfires, trees, and vegetation. Wildfires emit particulate matter directly, while trees and vegetation release organic compounds that contribute to secondary particle formation.
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Suspended solids include organic matter, plastic waste, and sediments
Suspended solids are the fine particles of sediment in the water. They include organic matter, plastic waste, and sediments.
Organic suspended solids, such as decomposing matter or sewage effluent, often contain high levels of microorganisms like protozoa, bacteria, and viruses. These pathogens contribute to waterborne diseases such as cryptosporidiosis, cholera, and giardiasis. When this occurs in rivers and channels, the increased sediment loads can reduce navigability for ships and boats. In cases of excessive sedimentation, settleable solids from erosion and runoff can even halt freight passage entirely.
Pollutants can attach to suspended particles and enter the water. This is why an increase in turbidity can indicate potential pollution. Contaminants include bacteria, protozoa, nutrients (e.g. nitrates and phosphorus), pesticides, mercury, lead, and other metals. Several of these pollutants, especially heavy metals, can be detrimental and often toxic to aquatic life.
Suspended solids can have a negative impact on the biology of an aquatic system. Reduced water clarity decreases visibility for fish and diving birds. Suspended solids can clog fish gills and increase stress levels, which is often already amplified due to hypoxic conditions. They can also settle at the bottom of a river or lake, burying fish eggs, fish nursery areas, and invertebrate habitats, negatively impacting the food chain.
In addition to organic matter, suspended solids can also include plastic waste. Plastic waste can be a significant contributor to water pollution, as it can take hundreds of years to decompose. During this decomposition process, plastic can release toxic chemicals into the water, harming aquatic life and potentially entering the food chain.
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Health risks of PM include respiratory diseases and cardiovascular problems
Suspended particulate matter (SPM) refers to the mixture of tiny solid particles and liquid droplets floating in the air. These particles are released into the atmosphere through combustion processes, industrial activities, or natural sources. Wood combustion, for instance, releases toxic pollutants such as soot into the atmosphere. Construction activities contribute cement dust, which makes up a significant proportion of the total amount of pollutants globally.
Particulate matter (PM) is divided into two main groups based on size: large particles for inhalation (PM10) and smaller particles (PM2.5). PM2.5 particles are fine inhalable particles with diameters of 2.5 micrometres or smaller. These particles can be emitted directly from sources such as construction sites, unpaved roads, fields, smokestacks, or fires. They can also form in the atmosphere through complex reactions of chemicals like sulphur dioxide and nitrogen oxides.
The health risks associated with PM, particularly PM2.5, include respiratory diseases and cardiovascular problems. PM2.5 particles are small enough to be inhaled deeply into the respiratory tract, reaching the lungs. This can cause short-term health effects such as eye, nose, throat, and lung irritation, coughing, sneezing, a runny nose, and shortness of breath. Prolonged exposure to PM2.5 can also affect heart and lung function, exacerbating conditions like heart disease, asthma, and bronchitis.
Scientific studies have linked increased PM2.5 exposure with higher hospital admissions and emergency room visits for cardiovascular and respiratory diseases. In California, PM2.5 exposure contributes to approximately 2,800 hospitalisations for cardiovascular and respiratory issues annually. Long-term exposure to PM2.5 has also been associated with premature mortality, particularly in individuals with chronic heart or lung diseases. The International Agency for Research on Cancer (IARC) concluded in a 2015 review that particulate matter in outdoor air pollution causes lung cancer.
To protect public health, organisations like the Environmental Protection Agency (EPA) in the United States have established National Ambient Air Quality Standards for PM2.5. These standards aim to ensure that particulate matter concentrations in outdoor air do not reach harmful levels.
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Regulations and monitoring systems are in place to reduce and manage PM pollution
Suspended particulate matter (SPM) refers to the mixture of tiny solid particles and liquid droplets floating in the air. These particles, such as dust, dirt, soot, or smoke, can be emitted directly from sources such as construction sites, unpaved roads, fields, smokestacks, or fires. They can also form in the atmosphere through complex reactions of chemicals like sulfur dioxide and nitrogen oxides. SPM is a major contributor to air pollution and has been linked to various respiratory diseases, including acute respiratory distress, asthma, chronic obstructive pulmonary disease, and lung cancer.
The EPA has also implemented monitoring regulations and requirements, such as the National Air Quality Monitoring Requirements, to address new technologies and ensure data accuracy. The Air Quality Index (AQI) is a valuable tool that translates air quality data into accessible information for the public, helping individuals understand the air quality in their area and take necessary health precautions.
Additionally, regional and state agencies play a role in monitoring and regulating PM pollution. For example, the Minnesota Pollution Control Agency (MPCA) actively tracks pollution trends and assesses whether federal and state air quality standards are met through its Air Monitoring Network Plan. The MPCA also conducts additional monitoring to understand the specific impacts of air quality on different communities.
Internationally, organizations like the ICPR have drafted initiatives such as the Sediment Management Plan to reduce the pollutant load of suspended matter in bodies of water like the Rhine River.
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Frequently asked questions
Suspended matter pollution refers to solid particles that are suspended in a liquid medium, typically larger than 0.45 μm in size. It can also refer to a mixture of solid particles and liquid droplets found in the air, which are released from combustion processes, industrial activities, or natural sources.
Suspended matter pollution comes from both human and natural sources. Natural sources include sea salt, wildfire smoke from forest fires, pollen, and mould. Human activities responsible for suspended matter pollution include construction, vehicle use, and industrial processes.
Suspended matter pollution can cause serious health problems, especially when particles are small enough to be inhaled. These particles can reach the lungs and even the bloodstream, leading to respiratory and cardiovascular issues such as acute respiratory distress, asthma, and chronic obstructive pulmonary disease.
