
U.S. EPA @EPA
EPA is required to set the National Ambient Air Quality Standards (NAAQS) for these criteria pollutants. From 1970 to 2018, the combined emissions of the six criteria air pollutants regulated under the NAAQS have dropped by 74 percent. #EPAat50 #ImprovingOurNationsAir https://t.co/sIIlZq0tGY — PolitiTweet.org