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. Author manuscript; available in PMC: 2013 Sep 16.
Published in final edited form as: Environ Int. 2012 May 14;45:112–121. doi: 10.1016/j.envint.2012.04.003

Table 4.

Pollutant Ratios

Cluster 1 Cluster 2 Cluster 3 Cluster 4 Cluster 5
Fe/Si 1.95 1.30 2.22 1.14 2.34
K/Si 1.34 0.71 1.35 0.71 1.54
BC/Sulfate 0.27 0.29 0.33 0.13 0.26
NO/NO2 0.73 0.63 1.58 0.44 0.87
NO2/BC 31.35 26.55 21.73 17.00 28.94
NO2/O3 0.54 0.59 2.47 0.41 1.08
Su/PM25 0.29 0.26 0.24 0.38 0.28
BC/PM25 0.08 0.07 0.08 0.05 0.07
PN/PM25 4.57 4.06 5.84 4.53 5.60