How secondary pollutants are formed?

Asked By: Vilmar Tennstedt | Last Updated: 15th May, 2020
Category: business and finance green solutions
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Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.

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Besides, what do you mean by secondary pollutant?

Secondary pollutants are pollutants which form in the atmosphere. These pollutants are not emitted directly from a source (like vehicles or power plants). Different types of secondary pollutants include: Ozone (O3) Sulfuric acid and nitric acid (component of acid rain)

One may also ask, what is the difference between primary and secondary pollution? Definition: A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.

Similarly, what are the sources of primary and secondary pollutants?

Examples of primary pollutants include sulfur dioxide (SO2), carbon monoxide (CO), nitrogen oxides (NOX), and particulate matter (PM). Examples of secondary pollutants include photochemical oxidants (ozone, nitrogen dioxide, sulfur trioxide) and secondary particulate matter.

How are primary pollutants formed?

Usually, primary pollutants are substances directly emitted from a process, such as ash from a volcanic eruption, the carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories. Rather, they form in the air when primary pollutants react or interact.

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Why are secondary pollutants bad?

Sulfur dioxide, associated SOx, and secondary pollutants can contribute to respiratory illness by making breathing more difficult, especially for children, the elderly, and those with pre-existing conditions. Longer exposures can aggravate existing heart and lung conditions, as well.

What is an example of a secondary pollutant?

Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.

Is no2 a primary pollutant?

The amount of nitrogen oxides emitted into the atmosphere as air pollution, from both man-made sources, can be quite significant. It's mainly produced by road traffic and energy production. While NO2 is a primary pollutant, it is also a contributing component for secondary pollutants formed from a chemical reaction.

Is smog a secondary pollutant?

Smog formation in general relies on both primary and secondary pollutants. Primary pollutants are emitted directly from a source, such as emissions of sulfur dioxide from coal combustion. Secondary pollutants, such as ozone, are formed when primary pollutants undergo chemical reactions in the atmosphere.

Is ozone a secondary pollutant?


Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface. It is called a "secondary" pollutant because it is produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants are nitrogen oxides (NOx) and volatile organic compounds (VOCs).

Is nitrogen dioxide a secondary pollutant?

Nitrogen dioxide, when prevalent in the air, appears as a reddish-brown haze. Nitrogen dioxide and other nitrogen oxides react with other chemicals in the air to form other pollutants, known as secondary pollutants. These secondary pollutants include ozone, particulate matter, acid rain, and other toxic chemicals.

What is acid rain and its effects?

Acid rain has many ecological effects, especially on lakes, streams, wetlands, and other aquatic environments. Acid rain makes such waters more acidic, which results in more aluminum absorption from soil, which is carried into lakes and streams.

How is pan formed?

PAN is formed by oxidation of non-methane volatile organic compounds (NMVOCs) in the presence of NOx. NMVOCs and NOx have both natural and anthropogenic sources. Fossil fuel combustion is the principal NOx source, with additional contributions from biomass burning, light- ning and soils (van der A et al., 2008).

What are the main pollutants?

The common air pollutants are:
  • Particulate matter (PM10 and PM2.
  • Ozone (O3)
  • Nitrogen dioxide (NO2)
  • Carbon monoxide (CO)
  • Sulphur dioxide (SO2)

Is Mercury a primary pollutant?


Primary pollutants come directly from sources such as industrial facilities, automobiles and forest fires. These include sulfur and nitrogen compounds, particulate matter, volatile organic compounds such as paint fumes and solvents, and toxic metals such as mercury.

What are the 5 major pollutants?

EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide.

What are the effects of air pollution?

Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs. Some scientists suspect air pollutants cause birth defects.

How can air pollution be controlled?

Reduce the number of trips you take in your car. Reduce or eliminate fireplace and wood stove use. Avoid burning leaves, trash, and other materials. Avoid using gas-powered lawn and garden equipment.

How is acid rain formed?

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

What are the main sources of air pollution?


There are four main types of air pollution sources:
  • mobile sources – such as cars, buses, planes, trucks, and trains.
  • stationary sources – such as power plants, oil refineries, industrial facilities, and factories.
  • area sources – such as agricultural areas, cities, and wood burning fireplaces.

What are the air quality standards?

Air quality standards. The Environmental Protection Agency EPA has established health-based National Ambient Air Quality Standards (NAAQS) for six pollutants: carbon monoxide, ozone, nitrogen oxide, sulfur dioxide, particulate matter, and lead. Particulate matter (PM-10, PM-2.5) is made up of dust, smoke and soot.

What pollution means?

Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.