Have the provisions of the clean air act affected the amount of air pollution in the united states explain

Yes pollution went down 57%. Outflows control programs that lessen air contamination from smokestacks and tailpipes give colossal air quality and medical advantages today, and the advantages will develop after some time as projects produce their full results. In 2020, the Clean Air Act Amendments will counteract more than 230,000 early fatalities.

answer; ( action training environment;