“One of America's great but untold environmental success stories is that we have made and continue to make great improvements in our air quality, thanks largely to state and federal implementation of the Clean Air Act and innovation in the private sector,” said EPA Administrator Andrew Wheeler.
He added, “The US is a global leader in clean air progress, and we've proven that we can protect the environment while growing our economy.” 1
The EPA announced nationwide concentrations of all measured air pollutants have dropped dramatically. From 1970 and 2017, the combined emissions of six key pollutants dropped by 73 percent, EPA reports. 2