Question

why was it important to establish the clean air act? to reduce the need to study the effects of dirty air on human health to determine ways to reduce the number of premature deaths per year to create a regulation that makes any activities that pollute the air illegal

Explanation:

The Clean Air Act aims to protect human health and the environment from the harmful effects of air pollution. Studying the effects of dirty air on human health helps in determining ways to reduce premature deaths and then creating regulations to make polluting activities illegal.

Answer:

All of the above - to reduce the need to study the effects of dirty air on human health, to determine ways to reduce the number of premature deaths per year, to create a regulation that makes any activities that pollute the air illegal.