Bronte Wells
Atmospheric pollution, also known as air pollution, is caused by a variety of solid and gaseous particles. These particles can be classified as primary or secondary pollutants. Primary pollutants are those that are directly emitted into the atmosphere, such as from vehicle emissions, industrial activities, and natural sources like wildfires. Secondary pollutants form as a result of reactions between primary pollutants in the atmosphere, such as ground-level ozone, which is a product of volatile organic compounds (VOCs) and nitrous oxides (NOx) reacting with sunlight and heat. These pollutants can have detrimental effects on human health and the environment, with particle pollution, ground-level ozone, carbon monoxide, nitrogen oxides, sulfur oxides, and lead being some of the most common and harmful types. They can irritate the eyes, nose, and throat, worsen asthma symptoms, and cause cardiovascular and respiratory issues. Additionally, temperature inversions, particularly in cities situated in basins, can trap polluted air and further deteriorate air quality.
| Characteristics | Values |
|---|---|
| Type | Primary and secondary |
| Composition | Solid matter or gaseous particles |
| Solid Particle Size | Ultrafine to coarse particles |
| Solid Particle Composition | Sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, water |
| Gaseous Particle Examples | Ground-level ozone, nitrogen dioxide, volatile organic compounds (VOCs) |
| Health Effects | Irritation of eyes, nose, throat, airway; worsening of asthma symptoms; cardiovascular issues; cerebrovascular issues; birth defects |
| Environmental Effects | Damage to monuments, statues, and cultural structures; regional environmental disruption; accelerated glacier melting |
| Sources | Traffic, transportation, industrial activities, power plants, construction sites, waste burning, fires, fields, cooking, space heating, lighting, animal fodder preparation, water heating, tobacco smoke |
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What You'll Learn
Particulate matter (PM)
PM is categorized based on the diameter of the particles. "Coarse particles" have diameters between 2.5 and 10 micrometers, while "fine particles" are 2.5 micrometers or smaller. These fine particles, known as PM2.5, pose the greatest risk to health. They are so small that they can be inhaled into the deepest parts of the lungs and may even enter the bloodstream. Long-term exposure to PM2.5 has been linked to premature death, particularly in people with pre-existing chronic heart or lung diseases, and impaired lung development in children.
The sources of PM vary. Some particles, such as dust, dirt, soot, or smoke, are large enough to be visible to the naked eye. These larger particles, often resulting from construction sites, agriculture, wildfires, and industrial activities, are categorized as PM10. PM10 can also include wind-blown dust from open lands, pollen, and fragments of bacteria. Fine particles (PM2.5), on the other hand, are often the result of combustion processes, including the burning of gasoline, oil, diesel fuel, or wood. They are also formed through chemical reactions in the atmosphere, involving pollutants such as sulfur dioxide and nitrogen oxides.
PM has significant impacts on both human health and the environment. In addition to the adverse health effects of PM2.5, short-term exposure to PM10 has been associated with the exacerbation of respiratory diseases, leading to hospitalizations. From an environmental perspective, PM can alter visibility by affecting how light is absorbed and scattered in the atmosphere. Additionally, certain constituents of PM contribute to climate warming (e.g., black carbon) or cooling (e.g., nitrate and sulfate). The deposition of PM on ecosystems can impact plant growth and water quality, and the soiling of materials.
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Ground-level ozone
Ozone is a gas composed of three oxygen atoms. While stratospheric ozone is beneficial as it protects living things from ultraviolet radiation from the sun, ground-level ozone is a harmful air pollutant. Ground-level ozone is formed when nitrogen oxides and volatile organic compounds react with each other in the presence of sunlight and hot temperatures. This reaction occurs due to pollutants emitted by vehicles, power plants, industrial boilers, refineries, chemical plants, and other sources. Ground-level ozone is the primary constituent of smog and is most likely to attain unhealthy levels on hot, sunny days in urban areas. However, it can also be transported by wind, affecting rural regions.
Washington State, for instance, has successfully reduced ozone pollution through improvements in vehicle emissions, cleaner fuels, and gas station vapour controls. However, areas like the Tri-Cities region near Kennewick still require close monitoring due to recently detected high ozone levels. To mitigate ozone pollution, the Washington State Department of Ecology recommends reducing vehicle usage, refuelling after dusk, limiting engine idling, and avoiding outdoor activities during periods of high ozone concentration.
The US Clean Air Act recognises ground-level ozone as one of the six common air pollutants, alongside particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. These pollutants have widespread impacts on human health, the environment, and property. To improve air quality in areas that do not meet the national standards, states develop implementation plans outlining measures to reduce emissions and enhance air quality. Once an area achieves compliance, it is designated as a "maintenance area" to ensure sustained improvement.
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Carbon monoxide
Additionally, carbon monoxide contributes to the formation of tropospheric ozone and interferes with methane destruction in the stratosphere. This interference with methane destruction is significant because methane is a potent greenhouse gas that contributes to global warming. By impeding its destruction, carbon monoxide indirectly influences climate change.
To ensure the safety of the public, the EPA (U.S. Environmental Protection Agency) has established standards and regulations to control carbon monoxide pollution. These standards help state, tribal, and local agencies maintain safe levels of carbon monoxide in the atmosphere.
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Nitrogen oxides
Elevated levels of nitrogen dioxide can have detrimental effects on human health. It can cause lung irritation, increase vulnerability to respiratory infections and asthma, and diminish immune responses to respiratory illnesses. Long-term exposure to high levels of nitrogen dioxide can lead to the development of chronic lung disease. Individuals with pre-existing conditions, such as asthma, young children, and the elderly, are particularly susceptible to the harmful effects of nitrogen dioxide.
In addition to direct emissions, indoor combustion sources of nitrogen dioxide also release co-pollutants, including ultrafine particles produced during cooking. Secondary reactions, such as the formation of nitrous acid, can further contribute to indoor pollutant concentrations that directly impact human health. High nitrogen dioxide concentrations are associated with the use of candles, mosquito coils, incense burning, and inadequate ventilation in enclosed spaces.
Nitrogen dioxide and other nitrogen oxides react with other chemicals in the air to form additional pollutants, including ozone, particulate matter, and acid rain. These pollutants can cause lung irritation, reduce immune responses to respiratory infections, and have adverse effects on the environment. Nitrogen oxides are one of the six common air pollutants, known as "criteria pollutants," regulated by organisations like the US EPA and monitored through techniques such as chemiluminescence and differential optical absorption spectroscopy (DOAS).
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Volatile organic compounds (VOCs)
The health effects of VOCs can be serious. VOCs can irritate the eyes, nose, and throat, cause headaches, nausea, dizziness, and difficulty breathing. Long-term exposure to VOCs can damage the liver, kidneys, and central nervous system, and some VOCs are known or suspected carcinogens. They may also worsen symptoms for people with respiratory conditions such as asthma and COPD.
To reduce exposure to VOCs, it is recommended to read product labels, avoid or limit the use of products with harmful ingredients, safely dispose of unwanted products, and increase ventilation when using products containing VOCs. Keeping buildings smoke-free and well-ventilated can also help reduce indoor VOC concentrations.
Regulatory bodies such as the U.S. Environmental Protection Agency (EPA) and the Occupational Safety and Health Administration (OSHA) have implemented measures to control VOC emissions and protect air quality. The VOC Solvents Emissions Directive in the European Union, for example, aims to reduce industrial emissions of VOCs across various solvent-using activities.
Overall, VOCs are a significant contributor to atmospheric pollution, with the potential to cause adverse health effects and environmental harm. Reducing their use and exposure is crucial for safeguarding human health and the planet.
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Frequently asked questions
Atmospheric pollution can be classified into primary and secondary pollution. Primary pollutants include solid particles and gaseous particles. Solid particles, also known as particulate matter (PM), can be further classified into PM2.5 and PM10, with the former being smaller and more dangerous as it can penetrate deep into the lungs and even enter the bloodstream. Sources of PM2.5 include the combustion of fuels in power generation facilities, industries, and vehicles. The main sources of PM10 are dust from roads, farms, dry riverbeds, construction sites, and mines. Gaseous particles include ground-level ozone, nitrogen dioxide, and volatile organic compounds (VOCs). Secondary pollutants, such as ground-level ozone, are formed due to interactions between primary pollutants in the atmosphere.
Toxic air pollutants, also known as hazardous air pollutants (HAPs), are known or suspected to cause cancer, birth defects, or adverse environmental effects. Examples of HAPs include benzene, perchloroethylene, methylene chloride, dioxins, asbestos, toluene, and metals such as cadmium, mercury, chromium, and lead compounds.
Particulate matter, especially PM2.5, can have serious health impacts. Short-term and long-term exposure to PM2.5 has been linked to cardiovascular issues, premature mortality, and respiratory problems such as aggravating asthma symptoms.
Temperature inversions, where warmer inland air traps cooler ocean air closer to the earth's surface, can prevent polluted air from dispersing. This phenomenon, known as marine inversion, often occurs during the summer and can significantly worsen ground-level exposure to pollutants.
