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The Clean Air Act specifically focuses on regulating air quality and controlling the emissions of air pollutants in the atmosphere. This legislation was designed to protect public health and the environment by setting standards for the allowable levels of harmful pollutants. The act authorizes the Environmental Protection Agency (EPA) to establish and enforce national air quality standards and to regulate emissions from various sources, including industries, vehicles, and other contributors to air pollution.

The other choices relate to different environmental concerns: water pollution standards fall under the Clean Water Act, noise pollution involves regulations that are typically managed at both federal and state levels but not specifically under the Clean Air Act, and waste management procedures are guided by the Resource Conservation and Recovery Act (RCRA) and other regulations. Thus, the focus of the Clean Air Act is clearly on air pollutants, making the answer regarding the amount of air pollutants allowed in the atmosphere the correct one.