What is one function of the Clean Air Act?

The correct response highlights a key function of the Clean Air Act, which specifically focuses on regulating air quality in the United States. This Act was established to control and reduce air pollution, which includes the management of criteria pollutants—substances deemed harmful to public health and the environment, such as carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. Additionally, it also addresses hazardous air pollutants, which are pollutants known to be toxic and potentially cause serious health effects or environmental damage. By setting standards and regulations for these pollutants, the Clean Air Act plays a crucial role in safeguarding air quality and public health.

In contrast, other options pertain to different environmental issues or regulatory areas. For instance, managing wastewater treatment plants does not directly pertain to air pollution, and promoting recycling initiatives is more about waste management than air quality. Overseeing the construction of residential buildings typically falls under local building codes and zoning regulations rather than air quality legislation.