Question

after the 1970 clean air act was implemented, which of these had to create state implementation plans (sips) for air pollution reduction? each state each mayor each county each person

Explanation:

The 1970 Clean Air Act required each state to develop State Implementation Plans (SIPs) to detail how they would achieve national air quality standards. Mayors, counties, or individuals do not have this requirement; it is a state - level obligation.

Answer:

A. each state