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
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.