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. Author manuscript; available in PMC: 2014 Sep 27.
Published in final edited form as: Occup Environ Med. 2008 Nov 18;66(3):189–197. doi: 10.1136/oem.2008.041376

Table 2.

County-level mean particulate matter (PM2.5) levels,* Southern California, 1 October–15 November 2003

Daily PM25 levels (mg/m3) County
Los Angeles Orange Riverside San Bernardino San Diego Ventura
Before fires
    Dates 01/10–23/10 01/10–23/10 01/10–20/10 01/10–20/10 01/10–24/10 01/10–22/10
    Concentration (SD) 27.2 (12.4) 23.3 (9.6) 32.7 (14.7) 35.7 (16.6) 18.5 (6.7) 18.4 (8.3)
During fires
    Dates 24/10–29/10 24/10–28/10 21/10–29/10 21/10–30/10 25/10–30/10 23/10–30/10
    Concentration (SD) 54.1 (21) 64.3 (26.5) 42.1 (25.5) 45.3 (28.7) 76.1 (66.6) 50.1 (50.5)
After fires
    Dates 30/10–15/11 29/10–15/11 30/10–15/11 31/10–15/11 31/10–15/11 31/10–15/11
    Concentration (SD) 15.9 (5.5) 15.5 (10.2) 16.9 (8.6) 18.4 (8.3) 14.2 (7.2) 12.9 (4.3)
*

PM25 concentrations are calculated with equal weighting per zip code.