Definition and Citations:
A substance in air that can harm in a high concentration. They can be solid, liquid, or gas. They are in two groups. The first group comes from an identified group. The second comes from interactions between pollutants.
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A substance in air that can harm in a high concentration. They can be solid, liquid, or gas. They are in two groups. The first group comes from an identified group. The second comes from interactions between pollutants.