Table 3.

Correlations between pollutants and socio-economic indicators based on yearly data for the period 1995–2017.

	PM10	SO2	NO2
GS	− 0.984**	− 0.410	− 0.153
IEE	− 0.940**	− 0.328	− 0.080
SE	0.842**	0.144	− 0.051
SDE	0.699**	0.707**	0.491*
PRP	− 0.979**	− 0.401	− 0.159
GDP	− 0.837**	− 0.428*	− 0.153
EC	− 0.901**	− 0.192	− 0.145
MV	− 0.942**	− 0.602*	− 0.705**
EI	− 0.849**	− 0.417*	− 0.153

GS: green space area; IEE: total industrial exhaust emissions; SE: total amount of smoke emissions; SDE: total amount of exhaust sulfur dioxide emissions; PRP: permanent resident population; GDP: gross domestic product; EC: energy combustion; MV: number of motor vehicles; EI: environmental investment.

**p < 0.01; *p < 0.05.