Which agency is primarily responsible for setting standards for air quality in the United States?

The Environmental Protection Agency (EPA) is the agency primarily responsible for setting standards for air quality in the United States. Under the Clean Air Act, the EPA establishes National Ambient Air Quality Standards (NAAQS) to protect public health and the environment from harmful pollutants. This includes monitoring air quality, regulating emissions from various sources, and enforcing compliance with environmental laws aimed at improving and maintaining air quality.

The agency conducts extensive research on air pollution and its effects, guiding its regulations and policy decisions based on scientific evidence. The role of the EPA is critical in managing air quality issues, as it collaborates with state and local governments to implement these standards and ensure that the air remains safe for public health and the environment.