Table 3.

Correlations among pollutants and meteorological variables.

	NO2	O3 (maxi-mum)	PM2.5 (mass)	PM2.5 (nitrates)	PM2.5 (organic carbon)	PM0.1 (mass)	PM2.5 (elemental carbon)	On-road diesel PM2.5	On-road gasoline PM2.5	Biomass comb-ustion PM2.5	Relative humidity (%)	Temp-erature (C)
NO2	1.000	−0.255	0.715	0.615	0.843	0.691	0.849	0.731	0.842	0.522	0.232	0.077
O3 (maximum)	−0.255	1.000	0.263	0.304	−0.286	0.090	−0.066	0.090	−0.175	−0.291	−0.584	0.093
PM2.5 (mass)	0.715	0.263	1.000	0.898	0.683	0.839	0.885	0.893	0.804	0.253	−0.021	0.114
PM2.5 (nitrates)	0.615	0.304	0.898	1.000	0.519	0.659	0.728	0.705	0.693	0.095	−0.002	0.125
PM2.5 (organic carbon)	0.843	−0.286	0.683	0.519	1.000	0.797	0.857	0.742	0.847	0.793	0.248	0.047
PM0.1 (mass)	0.691	0.090	0.839	0.659	0.797	1.000	0.817	0.751	0.716	0.464	−0.032	0.062
PM2.5 (elemental carbon)	0.849	−0.066	0.885	0.728	0.857	0.817	1.000	0.929	0.933	0.414	0.154	0.089
On-road diesel PM2.5	0.731	0.090	0.893	0.705	0.742	0.751	0.929	1.000	0.866	0.352	0.046	0.081
On-road gasoline PM2.5	0.842	−0.175	0.804	0.693	0.847	0.716	0.933	0.866	1.000	0.449	0.270	0.076
Biomass combustion PM2.5	0.522	−0.291	0.253	0.095	0.793	0.464	0.414	0.352	0.449	1.000	0.193	−0.006
Relative humidity (%)	0.232	−0.584	−0.021	−0.002	0.248	−0.032	0.154	0.046	0.270	0.193	1.000	0.237
Temperature (C)	0.077	0.093	0.114	0.125	0.047	0.062	0.089	0.081	0.076	−0.006	0.237	1.000