Fig. 2From: Wildfire smoke exposure and early childhood respiratory health: a study of prescription claims dataSpatial distribution of total number of wildfire smoke-days (2010–2016) at each MSA for the (a) 0%, b 25%, and (c) 50% thresholds. Thresholds are defined as the population-weighted percentage of zip codes within a Metropolitan Statistical Area (MSA) required to experience a smoke-day, in order to assign a smoke-day to the MSABack to article page