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. Author manuscript; available in PMC: 2015 Mar 31.
Published in final edited form as: Water Air Soil Pollut. 2014 Oct 19;225(10):2187. doi: 10.1007/s11270-014-2187-3

Table 1.

Summary of 24-h pollutant concentrations and data in the study period

Location
Dates of
observations		 Xigu
April 1, 2009–
December 31, 2012		 Huanghebei
April 1, 2009–
December 31, 2012		 Tieluju
January 1, 2011–
December 31, 2012		 Xizhan
January 1, 2011–
December 31, 2012
PM10 Average (standard deviation) (µg/m3) 158.8 (118.0) 127.7 (95.5) 133.8 (86.6) 140.6 (79.7)
Minimum to maximum 24-h value (µg/m3) 9.0 to 1,818 10.0 to 1,712 11.0 to 887 15.0 to 645
Percent of days with data 99 % 98 % 98 % 99 %
NO2 Average (standard deviation) (µg/m3) 41.1 (24.5) 42.2 (23.0) 46.1 (21.5) 39.1 (24.3)
Minimum to maximum 24-h value (µg/m3) 5.0 to 201 7.0 to 176 2.0 to 159 2.0 to 134
Percent of days with data 99 % 98 % 99 % 98 %
SO2 Average (standard deviation) (µg/m3) 62.0 (46.3) 46.9 (48.0) 38.5 (39.9) 28.6 (30.5)
Minimum to maximum 24-h value (µg/m3) 1.0 to 344 1.0 to 374 1.0 to 222 1.0 to 235
Percent of days with data 98 % 95 % 98 % 99 %