Air PollutantHarmful substance or product introduced into the atmosphere.PollutantParticles, 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 PollutantSubstances that are pollutants immediately on entering the atmosphere. Compare secondary pollutant.Secondary PollutantPollutants generated by chemical reactions occurring within the atmosphere. Compare primary pollutant.
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