Citywyse: The Five U.S. Metros with the Largest Reduction in Particulate Pollution

Mar 15, 2019

This study looked at all US Combined Statistical Areas with a population over 250,000 and air quality index (AQI) records going back every year to 2004. To determine the five cities with the largest reduction in median AQI scores (representing the biggest decrease in air pollution), we calculated the difference between the sum of median AQI scores for years 2004-2008 and years 2014-2018. AQI data courtesy of Puraka Clean Air Research.

Read about the top five cities receiving a Wyse Award for their success in making their metros more liveable by reducing air pollution here.