Air Pollutant
Harmful substance or product introduced into the atmosphere.
Particles, gases, or liquid aerosols in the atmosphere which have an undesirable effect on humans or their surroundings. Something unfavorable to health and life that has been added to the environment.
Primary Pollutant
Substances that are pollutants immediately on entering the atmosphere. Compare secondary pollutant.
Secondary Pollutant
Pollutants generated by chemical reactions occurring within the atmosphere. Compare primary pollutant.

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