Table 2. Descriptive Indices of Air Pollutants and Climate Factors in Ahvaz from March 2008 to March 2015.
| Variable (Mean per month) | Mean | Median | Minimum | Maximum | SD |
|---|---|---|---|---|---|
| O 3 (ppm) | 0.062 | 0.021 | 0.007 | 2.064 | 0.280 |
| PM 10 (µg/m 3 ) | 237.15 | 162.50 | 25 | 4498 | 289.81 |
| NO (ppm) | 0.019 | 0.017 | 0.003 | 0.066 | 0.012 |
| NO 2 (ppm) | 0.021 | 0.017 | 0.002 | 0.081 | 0.016 |
| NO x (ppm) | 0.037 | 0.035 | 0.006 | 0.134 | 0.022 |
| CO (ppm) | 1.319 | 1.000 | 0.100 | 9.100 | 1.499 |
| SO 2 (ppm) | 0.021 | 0.016 | 0.001 | 0.096 | 0.019 |
| Temperature (°C) | 26.7 | 27.1 | 11.6 | 39.5 | 9.1 |
| Minimum temperature (°C) | 19.7 | 20 | 18.8 | 20.4 | 0.6 |
| Maximum temperature (°C) | 33.6 | 33.9 | 32.6 | 34.3 | 0.6 |
| Relative humidity (%) | 43.1 | 41.0 | 19 | 77 | 15.8 |
| Total rainfall (mm) | 14.0 | 2.4 | 0 | 113 | 23.4 |
| Total sunshine (hours) | 256.4 | 253.2 | 144 | 374 | 62.6 |
| Total evaporation (mm) | 264.7 | 255.2 | 41 | 541 | 161.3 |
| Wind speed (m/s) | 11.5 | 10.0 | 7 | 44 | 5.3 |
| Wind direction (°) | 227.2 | 270.0 | 42 | 350 | 82.6 |