Question

measuring air pollution
when air pollutants are measured by the epa, the amount of the pollutant is measured. in addition, what else is measured?
the amount of time the pollutant is present
the color of the pollutant

Explanation:

To determine what else the EPA measures when measuring air pollutants, we analyze the options. Measuring the amount of time a pollutant is present is relevant for understanding exposure and pollution levels over time. The color of the pollutant is not a standard measurement for air pollution assessment by the EPA.

Answer:

the amount of time the pollutant is present