Table 3.

Correlations of air pollutants for the year 2015 in residences of the elderly (n = 1241).

	PM2.5	PM2.5–10	NO2	CO	O3	SO2
PM2.5	1	0.820**	0.001	−0.224**	0.109*	0.807**
PM2.5–10		1	−0.272**	−0.473**	0.364**	0.629**
NO2			1	0.967**	−0.879**	0.363**
CO				1	−0.862**	0.117**
O3					1	−0.249**
SO2						1

Abbreviations: PM_2.5, particulate matter with aerodynamic diameter of 2.5 μm; PM_2.5–10, particulate matter with aerodynamic diameter of 2.5–10 μm; NO₂, nitrogen dioxide; CO, carbon monoxide; O₃, ozone; SO₂, sulphur dioxide.

*p < 0.001; **p < 0.0001.