Ambient air quality criteria, or standards, are concentrations of pollutants in the air, and typically refer to outdoor air. The criteria are specified for a variety of reasons including for the protection of human health, buildings, crops, vegetation, ecosystems, as well as for planning and other purposes.

1. Ambient Air
2. Stack Emission
3. Fugitive Emission
4. Vehicle Emission
5. Workzone Air Quality
6. Source/Process/Vent Emission
7. Waste Water
8. Effluent Water
9. Cooling Water