Question

how has the epa improved air quality over the last 30 years?
○ by monitoring pollutants and passing regulations to reduce air pollution
○ by decreasing soil erosion and dust storms
○ by building marine refuges to help protect marine life and reduce air pollution
○ by decreasing of fossil fuel use in motor vehicles and industry

Explanation:

The EPA's core strategies for improving air quality center on regulatory oversight and pollution monitoring. The other options are either unrelated to the EPA's primary air quality role (marine refuges, soil erosion) or are specific actions that fall under the broader umbrella of regulatory measures, not the overarching approach.

Answer:

A. by monitoring pollutants and passing regulations to reduce air pollution