Simulation of pollutants (IMAGE) Northwestern University Caption Chicago geography and simulated pollutants. (a) Neighborhoods and highways within the city of Chicago. Inset at lower left depicts the location of Chicago (black) within the 1.3 km domain. In the right column, we provide annualized WRF-CMAQ simulated (b) NO2, (c) O3, and (d) PM2.5 concentrations over Chicago and average concentrations within city limits (μ). Credit Northwestern University Usage Restrictions Add credit License Original 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.