TABLE 2.
FREQUENCY DISTRIBUTION OF THE DAILY LEVELS FOR AIR POLLUTANTS AND METEOROLOGICAL OBSERVATIONS DURING THE STUDY PERIOD
| Days | Mean | SD | 25th percentile | Med | 75th percentile | |
|---|---|---|---|---|---|---|
| Mineral dust particles, μg/m3 | 400 | 21.27 | 25.66 | 7.82 | 15 | 25.08 |
| Non–mineral dust particles, μg/m3 | 446 | 28.05 | 20.55 | 4.6 | 22.87 | 35.77 |
| Suspended particulate matter, μg/m3 | 446 | 17.52 | 11.68 | 9 | 14 | 23 |
| NO2, ppm | 446 | 12.61 | 5.85 | 8 | 12 | 17 |
| SO2, ppm | 446 | 0.86 | 0.69 | 0 | 1 | 1 |
| Ox, ppm | 446 | 35.17 | 9.79 | 29 | 36 | 41 |
| Pollen, /cm2 | 400 | 31.8 | 76.7 | 0 | 3 | 21 |
| Average temperature, °C | 446 | 7.64 | 4.86 | 3.8 | 7.2 | 11.2 |
| Temperature difference from the previous day, °C | 446 | 0.15 | 2.9 | −1.4 | 0.3 | 1.8 |
| Temperature difference within the day, °C | 446 | 9.1 | 3.7 | 6.2 | 8.8 | 1.2 |
| Average air pressure, hPa | 446 | 1,014.7 | 6.34 | 1,010.1 | 1,015.2 | 1,019.5 |
| Air pressure difference from the previous day, hPa | 446 | −0.01 | 0.29 | −3.90 | 0.55 | 4.20 |
| Wind speed, m/s | 446 | 6.7 | 2.6 | 4.6 | 6.2 | 8.4 |
| Humidity, % | 446 | 74.4 | 12.4 | 66 | 76 | 84 |
Defnition of abbreviations: Ox = photochemical oxidants.