The Clean Air Act Amendments refer to a series of legislative changes made to the original Clean Air Act, which was first passed in 1963 and significantly updated in 1970. These amendments aimed to address growing concerns about air pollution, enhancing federal authority to regulate emissions and setting stricter air quality standards. During the presidency of George H. W. Bush, the 1990 amendments were particularly notable as they introduced more comprehensive regulations targeting acid rain, ozone depletion, and toxic air pollutants, connecting environmental policy to broader discussions around public health and economic growth.