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Table 1 Summary Statistics of daily multipollutant data used to develop multipollutant day types in Atlanta during 2000-2007

From: Using self-organizing maps to develop ambient air quality classifications: a time series example

Variable Mean Standard deviation Variance Minimum Maximum Metric
CO (ppm) 1.0 0.8 0.58 0.1 5.9 1-hr Max
NO2 (ppb) 40.3 15.5 239.18 4.4 172.0 1-hr Max
NO x (ppb) 115.9 107.2 11498.48 5.0 996.0 1-hr Max
O3 (ppb) 41.8 20.4 424.94 2.0 132.1 8-hr Max
SO2 (ppb) 14.2 14.5 218.23 1.0 129.5 1-hr Max
PM2.5 EC (μg/m3) 1.4 0.9 0.93 0.1 9.3 24-hr Avg
PM2.5 OC (μg/m3) 4.0 2.3 5.25 0.4 30.9 24-hr-Avg
PM2.5 NH4 (μg/m3) 2.0 1.2 1.43 0.2 8.7 24-hr Avg
PM2.5 NO3 (μg/m3) 0.9 0.8 0.68 0.0 7.4 24-hr Avg
PM2.5 SO4 (μg/m3) 4.5 3.1 9.99 0.5 23.2 24-hr Avg