Long-term Trends The EPA provides consistent raw data from 1980 to 2020 showing very rapid improvements from 1980-2000 and continued, but slower improvements in the last 20 years on 7 measures of air quality. For each item, reductions from 1980-2020 and from 2010-2020 are listed. Carbon monoxide: -81%, -12% Lead: N/A, -86% NO2: -64%, -21% … Continue reading Good News: US Air Pollution Declines