Which agency was established to set and enforce environmental protection rules in the United States?

The Environmental Protection Agency (EPA) was established specifically to set and enforce federal environmental regulations in the United States. Formed in response to the growing awareness of environmental issues in the late 1960s, the EPA's primary purpose is to protect human health and the environment by regulating pollutants and ensuring compliance with environmental laws.

This agency develops and enforces regulations based on laws passed by Congress, involving areas such as air quality, water quality, hazardous waste management, and chemical safety. The establishment of the EPA marked a significant commitment by the federal government to environmental stewardship, ensuring that various ecosystems and public health standards are maintained.

The other agencies listed have distinct missions that do not focus on environmental protection. For example, the FDA regulates food, pharmaceuticals, and cosmetics; the CDC focuses on public health and disease prevention; and the DEA handles drug enforcement and controlled substances. Each plays a critical role in its designated area but does not engage directly in environmental regulation like the EPA does.