Environment & Ecology · Environmental Engineering
Primary air pollutants differ from secondary air pollutants primarily because primary pollutants are:
- 1designated specifically as hazardous air pollutants.
- 2formed by chemical transformations in the air after release.
- 3directly emitted from identified sources.✓
- 4present in levels that can be weighed on filter paper.
Correct answer
directly emitted from identified sources.
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