Table 2

Distribution of air pollutants and meteorological variables

O3 (μg/m3)Sunlight (min/day)Wind (m/s)§Temperature (°C)Humidity (%)PM10 (μg/m3)SO2 (μg/m3)CO (μg/m3)NO2 (μg/m3)
Mean38.2315.93.5315.193.220.53.445636.0
SD24.4273.51.588.96.911.63.027414.3
Median37263316.39618339235
Minimum000−4.5510006
Maximum1239101039.310090242265110
O3 levels*
 (0–7)3.31102.406.597.432.96.785150.5
 (8–14)11.01833.098.996.525.75.265546.3
 (15–22)18.52073.6610.695.020.94.654743.2
 (23–29)25.72313.9812.294.619.23.847940.7
 (30–37)33.52323.9215.594.416.32.940634.2
 (38–45)41.52903.9117.493.615.42.536531.1
 (46–52)49.03373.7919.393.015.72.431729.3
 (53–60)56.24083.7520.791.616.11.929928.0
 (61–70)64.85203.5423.990.618.81.929627.8
 (71–123)84.16813.4129.484.623.51.626528.0
  • * The continuous O3 variable has been transformed into 10 levels using nine cut-off points based on the percentiles.

  • Maximum temperature.

  • Maximum humidity.

  • § Daily wind mean.

  • PM10, particulate matter with an aerodiameter of ≤10 μg/m3.