Asked by Lily

What is the difference between ambient air quality standards and absolute emission standards?
Answered by FredR
If you take a sample of air in your neighborhood and compare the concentration of various contaminants with the maximum allowed values, the maximum allowed values would be the air quality standards. If you measure the output of various compounds from a piece of equipment, such as a diesel engine, the maximum allowable concentration of the compounds would be absolute emission standards.
Answered by Lily
thank you
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