Dan Jaffe, PhD, left, and Dr. Praphulla Chandra Boggarapu, a Post-doctoral research associate, discuss equipment used to gather smoke data in the Jaffe Group lab at UW in Bothell, Wash., September 26, 2019. Jaffe is Professor of Atmospheric Chemistry at the UW in the Department of Atmospheric Sciences and in the School of STEM at UW Bothell. (Photo by Dan DeLong)