Table 2

Spearman's correlations between average daily concentrations of air pollutants and temperature

	PM₁₀	Black Smoke	PNC 0.01–0.03	PNC 0.03–0.1	PNC 0.1–0.3	PNC 0.3–1.0	PNC 1.0–3.2	PNC 3.2–10	NO₂	CO	°C
All correlation coefficients, but those of PM₁₀, black smoke, PNC 0.1–0.3, PNC 0.3–1.0, and NO₂ with temperature, are significant at the p<0.05 level.
PM₁₀	1.0	0.80	0.56	0.70	0.82	0.80	0.75	0.66	0.64	0.52	0.12
Black smoke		1.0	0.74	0.87	0.87	0.81	0.88	0.80	0.88	0.80	−0.12
PNC 0.01–0.03			1.0	0.92	0.53	0.37	0.89	0.90	0.88	0.81	−0.54
PNC 0.03–0.1				1.0	0.75	0.58	0.98	0.94	0.92	0.87	−0.43
PNC 0.1–0.3					1.0	0.92	0.79	0.68	0.69	0.71	−0.12
PNC 0.3–1.0						1.0	0.61	0.50	0.56	0.60	−0.09
PNC 1.0–3.2							1.0	0.95	0.91	0.84	−0.34
PNC 3.2–10								1.0	0.88	0.79	−0.32
NO₂									1.0	0.85	−0.17
CO										1.0	−0.43