NO2 Disparity Maps (IMAGE) University of Washington Caption In columns A and B, red identifies locations where NO2 concentrations were higher for nonwhites than whites; blue indicates that NO2 concentrations were higher for whites than nonwhites; and white means they were equal. In column C, red indicates that the absolute difference in NO2 concentration between nonwhites and whites increased over time; blue indicates that difference decreased over time; and white indicates no change. Credit University of Washington Usage Restrictions with credit 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.