Table 2.

Spearman’s correlation between air pollutants, temperature, and relative and absolute humidity and COVID-19 death cases

	Death cases	Temp	RH	AH	NH3	PM2.5	PM10	NO2	SO2	CO	O3
Death cases	1.00*
Temp	−0.12*	1.00
RH	−0.35*	−0.14	1.00
AH	−0.18*	−0.34	0.45	1.00
NH3	−0.16*	0.57*	0.28*	0.12	1.00
PM2.5	−0.41*	0.07	−0.31	0.34	−0.04	1.00
PM10	−0.33*	0.09	−0.33	0.14	0.03	0.63*	1.00
NO2	−0.36*	0.18	−0.29*	0.07	−0.08	0.54*	0.50*	1.00
SO2	−0.44*	0.34*	−0.54*	0.02	0.01	0.27*	0.36*	0.67*	1.00
CO	−0.39*	0.41*	−0.03	0.16	0.26*	0.15*	0.43*	0.55*	0.41*	1.00
O3	0.34*	0.06	−0.68*	0.18	−0.30	0.36	0.31	0.21*	0.39*	0.01	1.00

COVID-19 DC, corona virus death cases 2020; P₇₅, 75th percentile; P₂₅, 25th percentile; PM₁₀, particulate matter with aerodynamic diameter ≤10 μm; PM_2.5, particulate matter with aerodynamic diameter ≤ 2.5 μm; O₃, ozone; NO₂, nitrogen dioxide; CO, carbon monoxide; SO₂, sulfur dioxide; RH, relative humidity; AH, absolute humidity; NH₃, ammonia. *p < 0.05