Extended Data Fig. 1: Pollution stations and method used to construct non-smoke PM2.5 estimates.
From: The contribution of wildfire to PM2.5 trends in the USA
a. Example of total and non-smoke partitioning for a single station in CA in 2020. On days without a smoke plume overhead (no grey points), all PM2.5 is assumed to be from non-smoke sources. On days with a plume overhead (grey points), PM2.5 anomalies from the non-smoke month- and station-specific 3-year median are attributed to smoke, and total PM2.5 minus anomalies are attributed to non-smoke (blue). b. Annual average total and non-smoke PM2.5 for the same station are produced by aggregating daily total observed PM2.5 (black) and the daily estimates of non-smoke PM2.5 (blue). c. Locations of PM2.5 stations throughout the contiguous US. Stations are coloured by the number of years with at least 50 observations.
