Kiera Jefferson
Atmospheric pollutants are substances that accumulate in the air at rates that exceed the natural capacity of the environment to dissipate and dilute or absorb them. These pollutants can be naturally occurring or byproducts of industrial processes, and they include gases, finely divided solids, and finely dispersed liquid aerosols. Common atmospheric pollutants include smoke, smog, carbon monoxide, nitrogen and sulfur oxides, and hydrocarbon fumes. The effects of these pollutants on humans, animals, and plants vary depending on factors such as the type of pollutant, its concentration in the air, and the duration of exposure. Given the serious damage caused by atmospheric pollution, control and reduction have become high priorities in many countries.
| Characteristics | Values |
|---|---|
| Definition | Atmospheric pollutants are substances that accumulate in the air to a degree that is harmful to living organisms or to materials exposed to the air. |
| Types | Gaseous pollutants, solid pollutants, liquid pollutants, smoke, smog, carbon monoxide, nitrogen and sulfur oxides, hydrocarbon fumes, ground-level ozone, lead, benzene, perchloroethylene, methylene chloride, dioxins, asbestos, toluene, cadmium, mercury, chromium, lead compounds, biological pollutants, etc. |
| Sources | Fossil fuels, coal combustion, industrial processes, human activities, vehicles, airplanes, power plants, factories, cigarette smoke, wildfires, volcanoes, windblown sand or dust, etc. |
| Effects | Eye and respiratory tract irritation, reduced lung function, asthma, heart problems, serious illness, death, environmental damage, economic effects, etc. |
| Control Measures | Air alerts, limiting industrial activities, greater energy efficiency, use of N95 respirators, air filtration systems, etc. |
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What You'll Learn
Natural vs. anthropogenic sources
Atmospheric pollutants are substances that accumulate in the air and are harmful to living organisms, the environment, and materials exposed to the air. They can be classified as physical, chemical, and biological sources, and further as natural and anthropogenic sources.
Natural Sources
Natural sources of atmospheric pollutants include wildfires, dust storms, and volcanic eruptions. Wildfires, which have become more common and severe due to climate change, release fine particles and are a major source of air pollution. Vegetation, especially in warmer climates, emits gases that contribute to ozone formation and particle pollution. Wind-blown dust, natural decomposition of organic substances, and natural fires also contribute to natural atmospheric pollution. However, these sources are not a major concern as they are part of the natural environmental equilibrium.
Anthropogenic Sources
Anthropogenic sources, or human activities, are a major concern as their sources are increasing with the rise in global population and energy demands. These sources include the combustion process in large power plants and piston engines, burning fossil fuels for electricity and transport, waste management, and industrial activities. The release of heavy metals into the atmosphere through the burning of fossil fuels and industrial effluents is a significant issue. Coal-fired power plants, for example, emit significant amounts of mercury into the atmosphere. Urban traffic is another source, with the abrasion of tires, fuel residues, and fluid leakages contributing to heavy metal pollution in cities. Residential heating systems, agricultural systems, and transportation are also major anthropogenic sources of air pollution.
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Criteria pollutants
Atmospheric pollutants are substances that accumulate in the air to a degree that is harmful to living organisms or materials exposed to the air. They can be naturally occurring or byproducts of industrial processes. In densely inhabited areas, particularly in industrialised countries, human activities are the principal sources of atmospheric pollution.
The Clean Air Act requires the US Environmental Protection Agency (EPA) to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants known as "criteria pollutants". These pollutants are found all over the United States and are common in New Hampshire, the rest of the United States, and much of the world. They are particulate matter (often referred to as particle pollution), ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. These pollutants can harm human health, harm the environment, and cause property damage.
Of the six pollutants, particle pollution and ground-level ozone are the most widespread health threats. EPA calls these six pollutants "criteria" air pollutants because it regulates them by developing limits that are based on human health and/or environmental criteria. Primary standards provide public health protection, including protecting the health of sensitive populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.
Sources of air pollutants are particularly abundant in modern, industrial population centres. Major sources include power and heating plants, industrial manufacturing plants, and transportation vehicles. An example of a city that has not adequately controlled harmful emissions is Mexico City, where many residents suffer from respiratory ailments. Another example is Los Angeles, where photochemical smog was first recognised as a serious problem in the late 1940s.
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Health effects
Atmospheric pollutants refer to the presence of harmful substances in the air, which can be detrimental to human health and the planet. These pollutants can be in the form of gases or small particles and can have both direct and indirect impacts on the human body. While the effects of air pollution depend on factors such as the type of pollutant, length and level of exposure, and individual health risks, it is estimated that air pollution is responsible for approximately seven to eight million deaths annually worldwide.
One of the significant health effects of atmospheric pollutants is the increased risk of respiratory issues. Particle pollution, for instance, involves tiny particles that can infiltrate deep into the lungs and even enter the bloodstream. These particles can irritate the airways, leading to coughing, difficulty breathing, and other respiratory symptoms. People with pre-existing lung conditions, such as asthma and chronic obstructive pulmonary disease (COPD), are particularly vulnerable to the effects of air pollution, which can exacerbate their symptoms and lead to severe consequences, including hospitalisation and, in some cases, death.
Air pollution also poses cardiovascular risks. The inhalation of fine particles and exposure to certain gases can negatively impact heart health. This is especially pertinent for individuals with existing heart conditions, who may experience premature death due to the strain air pollution places on their cardiovascular system. Additionally, air pollution contributes to climate change, leading to warmer temperatures and extreme weather events. These changes can indirectly affect human health, with heat-related deaths and the increased transmission of infectious diseases being notable consequences.
Furthermore, atmospheric pollutants have been linked to adverse effects on mental health. While research in this area is ongoing, initial findings suggest a correlation between air pollution and mental health concerns. Additionally, certain pollutants, such as heavy metals, can have specific detrimental effects. For example, lead exposure has been associated with learning disabilities in children, while exposure to certain forms of chromium and mercury can increase the risk of cancer.
The health effects of atmospheric pollutants also extend to prenatal development. Studies indicate that exposure to air pollution during pregnancy may result in low infant birth weight and increased infant mortality. Moreover, air pollution can indirectly impact health through its contribution to environmental degradation. For instance, the release of certain compounds, such as chlorofluorocarbons (CFCs), can deplete the ozone layer, leading to increased exposure to harmful UV radiation. This, in turn, raises the risk of skin ageing and skin cancer.
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Air quality monitoring
Atmospheric pollutants are substances that accumulate in the air to a degree that is harmful to living organisms or materials exposed to the air. Common air pollutants include smoke, smog, and gases such as carbon monoxide, nitrogen and sulfur oxides, and hydrocarbon fumes.
One tool for monitoring air quality is the Air Quality Index (AQI), which rates atmospheric pollution levels on a scale of 0 to 500. The AQI provides the public with a quick understanding of the severity of air pollution and whether they should take protective measures. The AQI is used by AirNow, which provides real-time and forecasted air quality information for local areas and offers interactive maps and tools to help individuals understand the implications of air quality on their health.
Low-cost air pollution monitors are another tool for assessing indoor air quality. These devices use sensors to detect, monitor, and report on specific air pollutants like particulate matter (PM), carbon dioxide, and environmental factors such as temperature and humidity. While these monitors provide valuable insights, they may not detect all pollutants, and it is important to consider other strategies such as source control, ventilation, and air filtration to improve indoor air quality.
To effectively manage air quality, it is crucial to have systems in place to ensure data quality, record, store, analyze, and present the information. The Air Quality System (AQS) is a national repository of ambient air pollution data collected by the EPA, state, local, and tribal air pollution control agencies. The AQS includes meteorological data, information about monitoring stations, and data quality assurance details. Additionally, the EPA's Ambient Monitoring Technology Information Center (AMTIC) provides technical information on monitoring programs, networks of state or local air monitoring stations, and quality assurance procedures.
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Pollution control measures
Atmospheric pollutants are substances that accumulate in the air to a degree that is harmful to living organisms or materials exposed to the air. Common air pollutants include smoke, smog, and gases such as carbon monoxide, nitrogen and sulfur oxides, and hydrocarbon fumes. Atmospheric pollutants can be naturally occurring or byproducts of industrial processes. In densely inhabited areas, particularly in industrialised countries, human activities are the principal sources of atmospheric pollution.
The best way to protect air quality is to reduce the emission of pollutants by changing to cleaner fuels and processes. Pollutants not eliminated in this way must be collected or trapped by appropriate air-cleaning devices as they are generated and before they escape into the atmosphere. Common types of equipment for collecting fine particulates include cyclones, scrubbers, electrostatic precipitators, and baghouse filters.
Greater energy efficiency in vehicles, homes, electrical power plants, and industrial plants lessens pollution from these sources. For example, switching to electric or hand-powered lawn equipment can help, as gas-powered small engines often lack pollution control devices.
Airborne particles can be removed from a polluted airstream by a variety of physical processes. To achieve the national standard for ambient air quality for ozone, the US government implemented the use of low-solvent technologies and/or add-on control equipment for surface coating operations, vapor control in gasoline marketing, and maintenance programs for proper VOCs control. Implementing strict limitations for driving heavy-duty diesel trucks in urban areas during the daytime has also proven effective in Chinese cities.
The Air Quality Index (AQI) rates atmospheric pollution levels on a scale of 0 to 500, with the higher the number, the higher the concentration of pollution in the air. The AQI divides its scale into six levels of severity to give the public a quick sense of whether they should take measures to protect themselves, such as remaining indoors, wearing N95 respirators, or making use of air filtration systems.
Another immediate control measure involves a system of air alerts announced when air pollution monitors disclose dangerously high levels of contamination. Industrial sources of pollution are forced to curtail activities until conditions return to normal.
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Frequently asked questions
Atmospheric pollutants are substances that accumulate in the air at rates that exceed the natural capacity of the environment to dissipate and dilute or absorb them. They can be naturally occurring or a byproduct of industrial processes.
Common air pollutants include smoke, smog, and gases such as carbon monoxide, nitrogen and sulfur oxides, and hydrocarbon fumes.
Atmospheric pollutants can cause undesirable health, economic, or aesthetic effects. They can harm the health of humans, animals, and plants, and even damage buildings.
