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Earlier this month our very own Shelly Miller co-authored in the newest addition of Atmosphere (Volume 9, Issue 4) “Seasonal Variability of Airborne Particulate Matter and Bacterial Concentrations in Colorado Homes.” In this installment Shelly Miller and her co-authors discuss how the changing of the seasons also change particulate matter and bacterial concentrations in residences and their relationship with home characteristics, inhabitant activities, and outdoor air particulate matter. This study collected data from fifteen homes for one year in Colorado around the Boulder area. The results of this study were that the concentrations inside and outside of homes around Boulder, Colorado vary seasonally with highest levels during the summer.