Which year saw significant amendments to the Clean Air Act that expanded its scope?

The year 1990 was pivotal for the Clean Air Act, as significant amendments were enacted to broaden the scope of the original legislation. These amendments introduced new regulations aimed at addressing a variety of air pollution issues, including acid rain, urban smog, and the depletion of the ozone layer. They established stricter standards for air quality and introduced a program to reduce emissions of sulfur dioxide, which is a major contributor to acid rain. Additionally, the amendments mandated the development of national ambient air quality standards to protect public health and the environment.

This comprehensive overhaul demonstrated a commitment to improving air quality and highlighted the evolving understanding of environmental issues. The amendments laid the groundwork for more stringent controls and provided tools for enforcement, including a system of permits for major sources of air pollution. Overall, the changes made in 1990 were crucial for expanding the effectiveness and reach of the Clean Air Act, addressing a broader range of pollutants and fostering the development of new technologies for air quality management.