How many criteria pollutants are covered under the NAAQS?

How many criteria pollutants are covered under the NAAQS?

In what year was the ozone standard first initiated?

For which pollutant has the standard been most recently strengthened?

Over what period of time are lead measurements made to assess meeting the standard?

What human health effect is associated with exposure to carbon monoxide?

List the top two sources of sulfur dioxide emissions in the U.S.

Define a “non-attainment” area with respect to the NAAQS.

For which regions of the U.S. is attainment of PM10 a particular problem?