. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: Atmos Environ (1994). 2015 Feb 24;109:61–69. doi: 10.1016/j.atmosenv.2015.02.056

Table 3.

Linear regression coefficients, relative contributions of air pollution source types to aldehyde concentrations

Linear regression coefficients
	β₀ (intercept)	β₁ (mixed combustion)	β₂ (natural soil/road dust)	β₃ (secondary formation)	β₄ (oil combustion)	β₅ (vegetation burning)
Formaldehyde	28.7***	1.36	−4.46***	−8.63***	2.43	4.98***
Acetaldehyde	26.8***	1.61	−3.57	−2.89	6.15**	6.22***
Acrolein	2.20***	0.01	−0.17	−0.44***	0.24*	0.26**

P-value significance: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1″ 1