Table A1.

Spearman correlation coefficient between air pollutants and weather variables

	PM10	PM2.5	PSI	CO	NO2	SO2	O3	Rain	Hum	Temp
PM10	1.00
PM2.5	0.62*	1.00
PSI	0.68*	0.82*	1.00
CO	0.25*	0.25*	0.32*	1.00
NO2	−0.18	0.18	0.22	0.35*	1.00
SO2	0.24*	0.20	0.23	0.11	0.05	1.00
O3	0.52*	0.40*	0.31*	0.01	−0.30*	0.18	1.00
Rain	−0.07	−0.21	−0.23	0.27*	0.22	−0.26*	−0.24*	1.00
Hum	−0.27*	−0.26*	−0.28*	0.27*	0.47*	−0.10	−0.39*	0.68*	1.00
Temp	−0.03	0.24*	0.23*	−0.26*	−0.01	0.35*	0.09	−0.68*	−0.47*	1.00

*refers to p < 0.05.

Abbreviations: NO₂: nitrogen dioxide, SO₂: sulphur dioxide, CO: carbon monoxide, O₃: ozone, PSI: Pollutant Standards Index, PM_2.5: particulate matter with a diameter of 2.5 μm or less, PM₁₀: particulate matter with a diameter of 10 μm or less, Hum: Humidity, Rain: Rainfall, Temp: temperature.