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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 5.

Normalized pollutant concentrations

Cluster 1
740 days
Cluster 2
366 days
Cluster 3
107 days
Cluster 4
159 days
Cluster 5
344 days
PN (#) 1.43 0.90 0.85 0.25 1.37
O3 1.60 1.21 0.25 0.71 0.71
NO 1.18 0.84 1.83 0.24 1.24
NO2 1.30 1.07 0.93 0.44 1.15
BC 1.10 1.07 1.14 0.68 1.05
Sulfate 0.98 0.88 0.81 1.29 0.94
Ni 0.88 0.69 1.44 0.45 1.76
V 0.79 0.63 1.56 0.63 1.70
Fe 1.03 1.33 1.07 0.60 1.00
Zn 1.00 1.13 1.35 0.48 1.21
K 1.13 1.16 1.04 0.60 1.06
Si 0.88 1.70 0.80 0.87 0.71
Ca 1.05 1.40 0.85 0.62 1.01