define the term air pollutant
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An air pollutant is a material in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles, liquid droplets, or gases. A pollutant can be of natural origin or man-made. Pollutants are classified as primary or secondary.
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air pollutant are substance that pollute the air.
ex. Nitrogen dioxide (NO2)
Carbon monoxide (CO)
Sulphur dioxide (SO2)
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