	Asthma (J45 - J46) cold season	Asthma (J45 - J46) warm season	Asthma (J45 - J46) whole year
Air pollutants
SO₂, mg/m³	0.052*	0.034	0.123**
NO₂, mg/m³	−0.032	−0.050	0.059**
PM 10 µg/m³	−0.037	0.020	0.054**
PM 2.5 µg/m³	0.080**	0.108**	0.067**
CO, mg/m³	0.088**	0.021	0.117**
O₃, μg/m³	0.002	0.071*	−0.034
Meteorological factors
Average temperature	−0.009	−0.030	−0.097**
Wind velocity	−0.077**	−0.115**	−0.120**
Wind max velocity	−0.024	−0.035	−0.072**
Min temperature	−0.010	−0.047	−0.099**
Max temperature	−0.009	−0.007	−0.095**
Humidity	0.010	0.059*	0.056**