Satellite measurements of air quality in the Pacific Northwest are compared to results from the AIRPACT-3 regional air quality forecast system which utilizes the WRF/SMOKE/CMAQ modeling suite. Measurements such as tropospheric NO2 and O3 from the Ozone Monitoring Instrument (OMI) as well as CO from AIRS and/or MOPITT instruments are used as a basis for evaluation of the AIRPACT-3 emission inventory in urban areas. The comparison includes incorporation of the averaging kernel employed in the satellite product derivation to improve the basis for comparison with vertical profile model output.