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

a

Explanation:

all of the other options make no sence at all

were talking about air not water

also dust storms really!?

and the last one is kind of true but the first one has more detail

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.