Dr. Detlev Helmig of Boulder A.I.R., the City of Longmont’s air quality monitoring consultant, provided a semiannual update on Longmont’s ongoing air quality study to the Longmont City Council on April 6, 2021. Data collected at the Union Reservoir and Vance Brand Airport monitoring stations were summarized and compared to other data collected in the Front Range. His presentation can be seen at https://youtu.be/E9vIwYRnotE?t=1717.