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Table 1 Mass concentration, chemical composition and DTT activity of different PM size ranges in four sampling locations (nmol min-1 μg-1).

From: Relationship between redox activity and chemical speciation of size-fractionated particulate matter

Size Mode Sampling Period Location Mass (μg m-3 EC (%) OC (%) NO3 (%) SO4 (%) Metals &Elements (%) DTT activity (nmol min-1 μg-1)
PM0.15 June 2003 Downey 5.0 5.0 41.0 6.5 16.0 20.4 0.061
  July 2003 Downey 5.9 2.0 41.0 4.9 17.6 31.1 0.083
  July 2003 Riverside 7.6 2.0 29.0 13.0 21.0 27.0 0.052
  August 2004 Riverside 7.6 3.7 43.8 17.1 9.1 6.7 0.053
  Sept. 2004 Caldecott B1 24.5 20.5 47.3 1.6 4.3 13.1 0.111
  Sept. 2004 Caldecott B2 0.6 10.5 74.7 1.9 4.9 27.7 0.172
  January 2005 CA-110 3.8 24.0 178.0 42.7 22.8 4.5 0.042
PM2.5 June 2003 Downey 17.6 2.0 18.0 24.0 6.5 31.0 0.036
  July 2003 Downey 43.6 1.0 32.0 21.0 7.0 36.0 0.021
  July 2003 Riverside 27.9 2.0 22.0 34.0 9.4 30.3 0.027
  August 2004 Riverside 26.9 2.0 22.0 34.0 9.4 30.3 0.028
  July 2005 Riverside 22.1 1.3 24.5 14.6 10.9 31.0 0.026
  Sept. 2004 Caldecott B1 36.7 4.8 48.9 3.3 3.3 26.8 0.068
  Sept. 2004 Caldecott B2 15.4 2.7 41.8 0.9 2.1 24.1 0.075
  January 2005 CA-110 14.9 25.8 148.0 39.7 15.3 9.9 0.025
Coarse Sept. 2004 Caldecott B1 0.5 1.2 37.7 3.3 2.7 42.6 0.019
  Sept. 2004 Caldecott B2 0.7 0.4 14.0 0.6 2.2 52.8 0.032
  January 2005 CA-110 8.3 0.4 21.1 3.5 1.4 22.9 0.017