Primary pollutants and secondary pollutants

What is the difference between primary and secondary pollutants? What are two examples of 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. In contrast, secondary pollutants are produced by the reactions between primary pollutants and other molecules.

Primary pollutants are released due to human activities or naturally. However, secondary pollutants are often, made naturally. Other secondary pollutants include: smog , nitrogen dioxide , peroxyacyl nitrates , and sulfuric acid. Secondary Pollutants : 1. They are generally oxidizing. 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. The secondary pollutants are not emitted directly. Like CO, CO as these gaseous are directly emitted form burning of fossil fuel.

The first are those that are emitted directly from a source, which can be natural (volcanic eruptions or fires, for example) or of anthropogenic origin (carbon monoxide from vehicles). The EPA has set National Ambient Air Quality Standards for six principal pollutants , which are called criteria air pollutants. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Like CO CO as these gaseous are directly emitted form burning of fossil fuel.

Pollutants that are emitted into the environment from a source are called primary pollutants. The phenomena of photochemical smog (seen in high density cities, see Figure 1) is a result of the interactions of primary pollutants with other molecules in the air such as molecular oxygen , water and hydrocarbons. Nitrogen oxides are produced by combustion of fossil fuels at high temperature or by thunderstorms.

These emitted chemicals participate in a complex of ultraviolet-driven photochemical reactions on sunny days to synthesize some important secondary pollutants , most notably ozone , peroxy acetyl nitrate, hydrogen peroxide , and aldehydes. 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.

Primary and secondary pollutants are both contributors to air pollution. See full answer below. Certain primary pollutants can react with other elements or compounds, creating new chemicals that are known as secondary pollutants. Primary air pollutants - Materials that when released pose health risks in their unmodified forms or those emitted directly from identifiable sources. Vehicle emissions and emissions from other combustion sources may be significant primary sources of fine fraction (PM) particulate emissions.

Primary Pollutants A Primary Pollutant can be defined as a harmful chemical that directly enters the air as a result of either man made or natural activities. Discuss the difference between primary and secondary pollutants and provide three examples along with the source of each. These pollutants cause serious environmental problems, such as global warming and acid rain. All pollutants enter in the air either directly or indirectly. The primary source of pollution from a central source is from motor vehicles.

In order to fight these air pollutants , it is important to be able to classify and identify the different types of air pollutants. Ideally, air pollutants are divided into primary and secondary air pollutants. The production of PAN during photochemical reactions is an example of secondary pollutants. The pollutants is further classified as primary pollutants and secondary pollutants. Which are more harmful primary or secondary pollutants?

Though these statistics are horrifying, secondary pollutants can be more harmful and severe to human health than primary pollutants. These chemicals participate in photochemical reactions driven by ultraviolet light on sunny days and this in secondary pollutants , such as ozone, in our atmosphere. Air pollutants can also be of primary or secondary nature.