Kiera Jefferson
Particulate Matter (PM) is a mixture of solid particles and liquid droplets found in the air. PM pollution, also known as particle pollution, is one of the air pollutants regulated by the National Ambient Air Quality Standards (NAAQS). PM2.5 and PM10 are the two main categories of PM pollution. PM2.5 refers to fine inhalable particles with diameters of 2.5 micrometres or less, while PM10 includes larger particles such as dust from construction and agriculture. PM pollution is caused by emissions from combustion, industrial processes, and motor vehicle exhaust, among other sources. It can have significant adverse effects on human health, particularly for vulnerable groups such as children, infants, and older adults with pre-existing heart or lung conditions. To protect public health, organisations like the US EPA monitor air quality and provide alerts when PM levels become harmful.
| Characteristics | Values |
|---|---|
| Full Form | PM stands for Particulate Matter |
| Other Names | Particle Pollution, Fine Particle Pollution |
| Composition | Solid particles and liquid droplets |
| Size | Particles smaller than 10 micrometers can enter the lungs and particles smaller than 2.5 micrometers (PM2.5) can enter the bloodstream |
| Sources | Primary particles are emitted directly from sources such as construction sites, unpaved roads, fields, smokestacks, fires, combustion of gasoline, oil, diesel fuel, wood, etc. Secondary particles are formed in the atmosphere through chemical reactions of gases such as sulfur dioxide, nitrogen oxides, and certain organic compounds. |
| Effects | PM2.5 is associated with premature mortality, increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, respiratory symptoms, and restricted activity days. PM10 has been linked to respiratory mortality. |
| Tools for Measurement | Air Quality Index (AQI), GAIA air quality monitor |
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What You'll Learn
PM2.5 and PM10
Particulate Matter (PM) is an air pollutant consisting of a mixture of solid particles and liquid droplets found in the air. PM pollution is regulated by the National Ambient Air Quality Standards (NAAQS). Reducing emissions of inhalable particles improves public health and visibility.
PM10 and PM2.5 are both types of particulate matter. PM10 refers to inhalable particles with diameters of 10 micrometres or less. These particles can be inhaled into the lungs and are known to induce adverse health effects. Sources of PM10 include dust from construction sites, landfills, agriculture, wildfires, industrial sources, wind-blown dust, pollen, and bacteria.
PM2.5, on the other hand, refers to fine inhalable particles with diameters of 2.5 micrometres or less. These particles are so small that they can get deep into the lungs and even enter the bloodstream. They pose a greater risk to health than larger particles and are the main cause of reduced visibility in certain areas. Sources of PM2.5 include emissions from the combustion of gasoline, oil, diesel fuel, or wood, as well as construction sites, unpaved roads, fields, smokestacks, and fires.
Short-term exposures to PM2.5 have been linked to premature mortality, increased hospital admissions for heart or lung issues, acute and chronic bronchitis, asthma attacks, and respiratory symptoms. Long-term exposure to PM2.5 has been associated with premature death, particularly in individuals with chronic heart or lung diseases, and reduced lung function growth in children.
While the effects of long-term exposure to PM10 are less clear, several studies suggest a link between prolonged exposure and respiratory mortality. Short-term exposures to PM10 have been associated with the worsening of respiratory diseases, including asthma and chronic obstructive pulmonary disease (COPD), often leading to hospitalisations.
To protect oneself from harmful levels of PM pollution, individuals can refer to daily Air Quality Index (AQI) reports, which provide information on outdoor air quality and associated health risks.
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Health effects
PM2.5 refers to a category of particulate pollutants that are 2.5 microns or smaller in size. These particles are so small that they can travel deeply into the respiratory tract, reaching the lungs, and causing a range of adverse health effects. Short-term exposure to PM2.5 has been associated with increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, emergency room visits, respiratory symptoms, and restricted activity days. Long-term exposure to PM2.5 has been linked to premature death, particularly in people with chronic heart or lung diseases, and reduced lung function growth in children. Scientific studies have also linked increases in daily PM2.5 exposure with higher cardiovascular and respiratory hospital admissions, emergency department visits, and deaths.
PM2.5 particles are the main cause of reduced visibility (haze) and 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 such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from power plants, industries, and automobiles. The size of the particles is directly linked to their potential for causing health problems, with smaller particles posing greater risks.
In 2019, long-term exposure to PM2.5 pollution contributed to approximately 4.14 million deaths worldwide, accounting for 62% of all air pollution-related deaths. The burden is rising fastest in Asia, with South Asia, Southeast Asia, East Asia, and Oceania experiencing steep increases in total deaths attributable to PM2.5. The health effects of PM2.5 have severely impacted the populations of various regions, with the WHO estimating that air pollution kills approximately seven million people worldwide annually.
Certain populations are more vulnerable to the health effects of PM2.5 pollution. People with heart or lung disease, the elderly, infants, and young children are more susceptible to serious health impacts. Pregnant women may also be particularly sensitive to particle pollution. The groups most likely to experience adverse health effects from exposure to PM2.5 include older adults with chronic heart or lung disease, children, and asthmatics.
To protect public health, organizations like the Environmental Protection Agency (EPA) have established National Ambient Air Quality Standards for PM2.5. These standards set maximum levels of particulate matter that can be present in outdoor air without harming human health. It is important for individuals to stay informed about air quality conditions and take appropriate measures, such as reducing outdoor activities or using air purifiers, when particle pollution levels are unhealthy.
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Outdoor and indoor sources
Particulate matter (PM) is a mixture of solid particles and liquid droplets found in the air. These particles vary in size, with some visible to the naked eye and others so small that they can only be detected using an electron microscope. PM can be found both outdoors and indoors, and both sources pose significant health risks.
Outdoor Sources
Outdoor air pollution is a major environmental health problem, causing an estimated 4.2 million premature deaths worldwide in 2019, particularly in low- and middle-income countries. Outdoor PM sources include vehicle exhaust, the combustion of gasoline, oil, diesel fuel or wood, fires, and industrial processes. Wildfires can also produce PM and spread it over long distances. Outdoor particle pollution levels tend to be higher on still days with little to no wind or air mixing.
Indoor Sources
Indoor sources of PM include tobacco smoke, cooking, broiling or frying food, burning candles or incense, fireplaces, and fuel-burning space heaters. Chemical reactions can also generate PM indoors, with chemicals in the air reacting to produce PM. For example, household cleaning products and air fresheners can react to form particles.
It is important to note that outdoor PM can also enter indoor spaces through open doors and windows, small cracks, and building leaks. Therefore, it is recommended to keep windows closed when outdoor pollutants are high and to install higher efficiency filters in ventilation systems. Portable air cleaners can also help reduce indoor particle levels.
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Air quality standards
Particulate Matter (PM) is a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small they can only be detected using an electron microscope.
PM2.5 refers to fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller. These particles come in many sizes and shapes and can be made up of hundreds of different chemicals. Some are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks, or fires. Most particles form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from combustion. PM10 includes dust from construction sites, landfills, agriculture, wildfires, brush/waste burning, industrial sources, wind-blown dust from open lands, pollen, and fragments of bacteria.
PM is one of the air pollutants regulated by the National Ambient Air Quality Standards (NAAQS). Reducing emissions of inhalable particles improves public health as well as visibility. Ambient air quality standards define the maximum amount of pollutant that can be present in outdoor air without harming human health. The Air Quality Index (AQI) tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern. The AQI translates air quality data into numbers and colors that help people understand when to take action to protect their health. For each pollutant, an AQI value of 100 generally corresponds to an ambient air concentration that equals the level of the short-term NAAQS for protection of public health. AQI values at or below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is unhealthy: at first for certain sensitive groups of people, then for everyone as AQI values get higher.
Short-term exposures (up to 24 hours) to PM2.5 have been associated with premature mortality, increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, emergency room visits, respiratory symptoms, and restricted activity days. These adverse health effects have been reported primarily in infants, children, and older adults with preexisting heart or lung diseases. Long-term (months to years) exposure to PM2.5 has been linked to premature death, particularly in people who have chronic heart or lung diseases, and reduced lung function growth in children. The effects of long-term exposure to PM10 are less clear, although several studies suggest a link between long-term PM10 exposure and respiratory mortality. Older adults with chronic heart or lung disease, children, and asthmatics are the groups most likely to experience adverse health effects with exposure to PM10 and PM2.5.
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Reducing emissions
Reducing Outdoor PM Sources
Outdoor sources of PM2.5 and PM10 include vehicle exhaust, the combustion of gasoline, oil, diesel fuel or wood, industrial processes, wildfires, and agricultural activities. To reduce emissions from these sources, governments and industries can implement the following measures:
- Transition to cleaner energy sources and promote the use of electric vehicles to reduce emissions from combustion.
- Strengthen regulations on industrial emissions and enforce stricter air quality standards for industries, power plants, and automobiles.
- Implement wildfire prevention strategies, such as controlled burns and improved forest management practices.
- Improve agricultural practices, such as reducing dust emissions from fields and construction sites.
Reducing Indoor PM Sources
Indoor sources of PM include tobacco smoke, cooking with gas or wood, burning candles or incense, and indoor air pollution from household cleaning products and air fresheners. To reduce indoor PM levels:
- Avoid smoking indoors, and if possible, avoid smoking altogether.
- Use exhaust fans or range hoods when cooking to vent pollutants outdoors.
- Reduce the use of candles, incense, and oil lamps, especially when indoor air quality is poor.
- Choose natural cleaning products and air fresheners with fewer chemical pollutants.
Personal Protective Measures
When outdoor PM levels are high, individuals can take the following measures to reduce their exposure:
- Stay indoors and limit outdoor activities, especially for sensitive groups such as children, the elderly, and people with heart or lung conditions.
- Keep windows and doors closed to prevent outdoor pollutants from entering the indoor space.
- Use air conditioning or air purifiers to filter indoor air and reduce PM levels.
- Wear well-fitting masks rated to filter out PM2.5 particles when outdoors, such as N95 or KN95 masks.
Policy and Advocacy
Individuals can advocate for policies that reduce PM emissions and protect public health:
- Support elected officials who prioritize regulating PM pollutants and strengthening air quality standards.
- Encourage the development and implementation of national and regional plans to reduce emissions of PM precursors, such as sulfur dioxide and nitrogen oxides.
- Promote the use of renewable energy sources and electric vehicles through policy incentives and subsidies.
By combining emissions reduction strategies, policy changes, and individual actions, we can effectively reduce PM pollution and improve the health and well-being of communities worldwide.
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Frequently asked questions
PM stands for particulate matter, which is a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye, while others are so small they can only be detected using an electron microscope.
PM2.5 refers to fine inhalable particles, with diameters that are generally 2.5 micrometers and smaller. These particles are more likely to travel into and deposit on the surface of the deeper parts of the lung. They pose the greatest risk to health and are the main cause of reduced visibility (haze) in parts of the US.
PM10 refers to particles with diameters greater than 2.5 but less than 10 micrometers. These particles are more likely to deposit on the surfaces of the larger airways of the upper region of the lung. While less harmful than PM2.5, PM10 has been linked to respiratory mortality, particularly in older adults with chronic heart or lung disease, children, and asthmatics.
You can use air quality alerts, such as the Air Quality Index (AQI), to stay informed about when PM levels reach harmful levels in your area. The AQI is divided into six color-coded categories, each indicating a different level of health concern. When PM levels are high, you can take precautions such as limiting outdoor physical activities and wearing a mask to reduce your exposure.
