Table 2

Summary statistics of daily concentration of air pollutants and meteorological parameters

April until June (spring)July and August (summer)September until November (fall)December until March (winter)Over 1 year
MeanSDMeanSDMeanSDMeanSDMeanSD
PM2.5 (μg/m3)23.412.521.09.620.411.122.711.822.011.5
PM10 (μg/m3)40.326.533.911.832.218.931.717.434.420.0
OBC (μg/m3)0.50.30.40.30.50.30.50.40.50.4
NO2 (ppb)12.04.78.62.710.23.912.95.811.34.9
Ozone (ppb)36.010.022.310.622.28.023.79.126.111.0
Atmospheric pressure (hPa)1007.85.81005.74.91011.45.91014.25.51010.56.4
Relative humidity (%)69.211.574.17.472.88.367.89.470.59.8
Temperature (°C)17.94.827.71.918.36.05.53.215.59.0
Wind speed (m/s)2.70.82.70.82.50.92.60.92.60.9
Hours of daylight (h)5.64.46.63.95.53.65.23.25.63.7
  • NO2, nitrogen dioxide; OBC, optical black carbon; PM, particulate matter.