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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Environ Int. 2013 Jul 9;59:10.1016/j.envint.2013.06.003. doi: 10.1016/j.envint.2013.06.003

Table 4.

Comparing 3 and 6 day averaging of elements.

Element Mean SD
PM2.5 1.00 0.03
EC 1.00 0.03
OC 1.00 0.02
SO42-
1.00 0.03
Se 1.00 0.06
NO3 1.00 0.04
NH4+
1.00 0.04
Si 1.00 0.04
Ca 1.00 0.04
Fe 1.00 0.03
Ni 1.00 0.09
V 1.02 0.05
Cu 1.00 0.08
Zn 1.00 0.04
Pb 1.00 0.06
Mn 1.00 0.04
As 1.02 0.05
K 1.01 0.08
Cr 0.99 0.12
Na+ 1.00 0.04