Question: What Are Secondary Pollutants?

What are secondary pollutants examples?

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 CFC a secondary pollutant?

The pollutants have been classified into primary and secondary categories. … The major primary pollutants are Oxides of Sulphur, Oxides of Nitrogen, Oxides of Carbon, Particulate Matter, Methane, Ammonia, Chlorofluorocarbons, Toxic metals etc. The secondary pollutants are not emitted directly.

Is formaldehyde a primary or secondary pollutant?

A primary pollutant is a gas directly injected into the atmosphere. A secondary pollutant is a gaseous product of a reaction involving a primary pollutant. The EPA has set standards for formaldehyde levels in the air. Nothing is being done to control methane emissions.

What’s the difference between primary and secondary?

Primary sources are first-hand accounts of a topic while secondary sources are any account of something that is not a primary source. … Published research, newspaper articles, and other media are typical secondary sources.

What is the difference between primary and secondary pollutants quizlet?

What is the difference between primary and secondary pollutants? Primary pollutants are harmful substances emitted directly into the air. Secondary pollutants are formed when primary pollutants react with one another or with the basic components of air to form new harmful pollutants.

Is smog a secondary pollutant?

Secondary pollutants, such as ozone, are formed when primary pollutants undergo chemical reactions in the atmosphere. Photochemical smog, as found for example in Los Angeles, is a type of air pollution derived from vehicular emission from internal combustion engines and industrial fumes.

Is photochemical smog a secondary pollutant?

Photochemical smog is made up of various secondary pollutants like ozone, peroxyacyl nitrates (PANs), and nitric acid (seen in Figure 2). Different types of secondary pollutants include: Ozone (O3)

How do secondary pollutants harm the environment?

Secondary pollutants harm the environment by making acid rain and smog. Acid rain can dissolve hard materials (rocks, buildings, metals). Smog poses a human health hazard. Greenhouse gases can result in global warming, which can change many areas around the world.

Is Pan a secondary pollutant?

PANs are secondary pollutants, which means they are not directly emitted as exhaust from power plants or internal combustion engines, but they are formed from other pollutants by chemical reactions in the atmosphere.

Are secondary pollutants more harmful than primary?

Ans- They emit carbon monoxide which is one of the biggest contributors (by weight) to air pollution. Though these statistics are horrifying, secondary pollutants can be more harmful and severe to human health than primary pollutants. Smog is an example of a secondary pollutant.

Why 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).

Which one of the following is not a secondary pollutant?

Primary pollutants are directly emitted from the sources. Examples of primary pollutants are carbon monoxide, carbon dioxide, sulphur dioxide and benzene etc. Secondary pollutants are not emitted directly. They are formed from the combination of primary pollutants with some other compound.

How are primary and secondary pollutants harmful for humans and environment?

Primary pollutants are directly generated from human activities like from car, from ships, from construction work etc. … Secondary pollutants form due to mixing of primary pollutants and natural resources such as water, air etc. They are harmful like mixing of sulphuric acid susoended in air with rain to form acid rain .

What is the difference between primary and secondary air pollutants What are some examples of each?

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.

What are examples of primary and secondary pollutants?

Primary pollutants include ammonia, sulfur dioxide, nitrogen dioxide and carbon monoxide. Secondary pollutants include ground-level ozone, acid rain and nutrient enrichment compounds.

What is a secondary air pollution?

Secondary air pollution is pollution caused by reactions in air already polluted by primary emissions (from factories, automobiles and so forth). An example of secondary air pollution is photochemical smog.

Is no2 a secondary pollutant?

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.

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.