The physical or physiological processes by which substances, tissue, cells, etc. take up or take in other substances or energy.
D000393
Air Pollutants
Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or materials. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.
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D013458
Sulfur Dioxide
A highly toxic, colorless, nonflammable gas. It is used as a pharmaceutical aid and antioxidant. It is also an environmental air pollutant.