Characteristics of Atmospheric Compositions in the Background Area of Yangtze River Delta during Heavy Air Pollution Episode

Table 1

Correlation coefficient (CC) of concentrations of BC, CO, CO₂, and CH₄ and the ratio of ΔBC/ΔCO, ΔCO/ΔCO₂, and ΔCH₄/ΔCO₂ at Lin’an station.

	Prehaze period	Haze period
CC between BC and CO^#	0.5346	0.7534
CC between CO and	0.7922	0.9599
CC between CH4 and	0.5769	0.9460
ΔBC/ΔCO (μg m^−3/μg m^−3)	0.0075	0.0058
ΔCO/ΔCO2 (ppm/ppm)	0.0150	0.0217
ΔCH4/ΔCO2 (ppm/ppm)	0.0022	0.0054

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