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 |