Question

which piece of legislation designated the seven criteria air pollutants?
clean water act
endangered species act
clean air act
kyoto protocol

Explanation:

The Clean Air Act is a U.S. federal law that regulates air emissions. It is the legislation responsible for designating criteria air pollutants, which are common air pollutants that have widespread health or environmental effects. The Clean Water Act deals with water pollution, the Endangered Species Act focuses on protecting endangered species, and the Kyoto Protocol is an international treaty on climate change.

Answer:

Clean Air Act