EVERYDAY SCIENCE

Detailed explanation-1: -Secondary air pollutants: Pollutants that are formed in the lower atmosphere by chemical reactions. The two examples are ozone and secondary organic aerosol (haze). Secondary pollutants are harder to control because they have different ways of synthesizing and the formation are not well understood.

Detailed explanation-2: -Chemical pollution refers to the contamination of our environment with chemicals that are not found there naturally.

Detailed explanation-3: -Primary & Secondary pollutant. 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.

Detailed explanation-4: -Secondary pollutants form when primary pollutants react in the atmosphere. For example, ground-level ozone is created when hydrocarbons (HC) and nitrogen oxides (NOx) combine in sunlight. Some pollutants may be both primary and secondary.

Detailed explanation-5: -Secondary pollutants: When pollutants in the air mix up in a chemical reaction, they form an even more dangerous chemical. Photochemical smog is an example of this, and is a secondary pollutant.