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The San Diego 2007 wildfires and Medi-Cal emergency department presentations, inpatient hospitalizations, and outpatient visits: An observational study of smoke exposure periods and a bidirectional case-crossover analysis

Fig 2

Map of San Diego County wildfire PM2.5 by zip code, October 22–26, 2007 fire period.

Maps show zip code mean of average daily PM2.5 values across the 5-day fire-exposure period. Green indicates satisfactory levels according to the US EPA’s 24-hour standard. Fire extent is hatched. PM2.5, fine inhalable particles that are 2.5 micrometers and smaller; US EPA, US Environmental Protection Agency.

Fig 2

doi: https://doi.org/10.1371/journal.pmed.1002601.g002