What do the 1990 amendments to the Clean Air Act address?

The 1990 amendments to the Clean Air Act are significant because they comprehensively addressed multiple aspects of air quality management. These amendments expanded the original legislation's scope by not only focusing on air pollution prevention and control measures but also setting emissions standards for various sources, including transportation, and establishing protections for the stratospheric ozone layer.

By including provisions for air pollution prevention and control, the amendments aimed to manage and reduce air pollutants effectively while promoting initiatives that foster cleaner air. They also introduced stricter emissions standards for mobile sources, recognizing the vital role of transportation in contributing to air pollution.

Moreover, one of the critical areas addressed was the protection of the stratospheric ozone, which focuses on phasing out substances that deplete the ozone layer, such as chlorofluorocarbons (CFCs). This comprehensive approach demonstrates how the amendments tackled all these interconnected environmental issues, thereby making the option that encapsulates all of these critical measures the correct choice. The integration of various topics under a single legislative framework reflects a holistic strategy to enhance air quality and protect public health and the environment.