This proposal requests membership for Dr. R. Bradley Pierce (NOAA/NESDIS) on the Aura Science Team as an Applied Science representative to engage International, Federal, State and Local Air Quality Agencies in the use of NASA satellite trace gas and aerosol measurements in air quality assessment activities by: 1.Providing the air quality community with a multi-year global chemical and aerosol reanalysis using NASA Aura and A-Train measurements. 2.Conducting regional chemical data assimilation experiments to quantify the influences in changes in NOx emissions on US air quality during the Aura period. 3.Collaborating with International, Federal, State and Local air quality management communities in the utilization of the Aura and A-Train measurements and reanalysis for air quality assessment activities.