. 2016 Jan 6;6:18916. doi: 10.1038/srep18916

Table 3. Pearson correlations between concentrations (μg/m³) of PM_2.5 and the six components, as assigned to subjects at baseline and stratified by airshed.

	PM_2.5	Sulphate	Nitrate	Ammonium	Particulate organic mass	Black carbon	Mineral dust
PM_2.5	1	0.93	0.89	0.96	0.81	0.91	0.42
Sulphate		1	0.75	0.90	0.72	0.80	0.47
Nitrate			1	0.93	0.66	0.89	0.23
Ammonium				1	0.76	0.90	0.40
Particulate organic mass					1	0.71	0.49
Black carbon						1	0.30
Mineral dust							1

Table 3. Pearson correlations between concentrations (μg/m3) of PM2.5 and the six components, as assigned to subjects at baseline and stratified by airshed.