“…1 PM 2.5 and gases emitted from res vary widely by region, fuel type, density, and burning conditions. [19][20][21][22] Gas and particle emissions from prescribed burns in the western 20,23,24 and southeastern 15,17,20,25 regions of the United States have been characterized by comparing fuel types (i.e. chaparral, montane, pine trees) and burn conditions (smoldering or aming combustion).…”