Pollution Source Contributions to Total PM10 (IMAGE) European Commission Joint Research Centre Caption These are population-weighted averages for relative source contributions to total PM10 in urban sites Credit © EU, 2015 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.