Which US Government agency is responsible for implementing and monitoring the Clean Air Act?

The U.S. Environmental Protection Agency (EPA) is responsible for implementing and monitoring the Clean Air Act. Here are the steps they take:

1. Setting National Standards: The EPA sets National Ambient Air Quality Standards for pollutants considered harmful to public health and the environment.

2. State Implementation: Each state must develop a State Implementation Plan (SIP) that explains how it will do its part to carry out the Clean Air Act. The EPA must approve each SIP, and if a SIP isn't approved, the EPA can take over enforcement in that state.

3. Monitoring Air Quality: The EPA and its state partners monitor air quality across the country to ensure that air quality standards are met and maintained.

4. Enforcement: The EPA enforces the Clean Air Act by taking action against violators. The agency can issue fines and even bring criminal charges against those who violate the Act.

5. Reviewing Standards: The EPA is required to periodically review the national air quality standards to ensure they are adequate to protect public health and the environment.