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 person each mayor each county

Explanation:

The 1970 Clean Air Act required each state to develop State Implementation Plans (SIPs) to detail how they would achieve air quality standards. Individuals (each person), mayors, or counties alone don't have the regulatory scope to create such plans for air pollution reduction at the required level; states are the responsible entities here.

Answer:

each state