Summary statistics for daily air pollutants and meteorological factors during the study period (2005–2011)
| Dust storm | |||
| Yes | No | p-value | |
| Days n (%) | 289 (11.9) | 2126 (88.1) | |
| PM10 μg·m−3 | |||
| Mean±sd | 169.98±234.2 | 38.4±32.9 | <0.001 |
| IQR (maximum) | 80–159 (2568) | 25.7–45.6 (858) | |
| NO2 ppb | |||
| Mean±sd | 19.3±9.8 | 18.6±9.6 | 0.217 |
| IQR (maximum) | 12.4–23.9 (64.3) | 11.8–22.8 (95) | |
| CO μg·m−3 | |||
| Mean±sd | 1045±315.6 | 1013.9±320.8 | 0.084 |
| IQR (maximum) | 960–1146.8 (1517.9) | 1106–1160 (2476) | |
| SO2 ppb | |||
| Mean±sd | 5.6±2.1 | 4.9±2.26 | <0.001 |
| IQR (maximum) | 4.3–6.8 (13.8) | 3.4–6.3 (15.3) | |
| O3 ppb | |||
| Mean±sd | 70.1±17.2 | 72.5±17.6 | 0.028 |
| IQR (maximum) | 58.8–82.9 (116.5) | 60.8–84.6 (134.6) | |
| Temperature °C | |||
| Mean±sd | 20.5±5.8 | 20.3±5.9 | 0.571 |
| IQR (maximum) | 15.2–25.8 (34.2) | 15–25.8 (30.9) | |
| Relative humidity % | |||
| Mean±sd | 50.1±17.2 | 62.3±14.0 | <0.001 |
| IQR (maximum) | 36.8–63.6 (96.2) | 55–70.6 (100.96) | |
PM10: particulate matter <10 μm in diameter; IQR: interquartile range.