. Author manuscript; available in PMC: 2011 Dec 7.

Published in final edited form as: Int J Remote Sens. 2008 Jun;29(12):3383–3405. doi: 10.1080/01431160701474545

Table 4(b).

Regression of PM_2.5 on AOD, mean sea level pressure and relative humidity at 5 km pixel resolution – aggregate analysis.

PM₁₀ as a function of:	Interval across satellite crossing time (h: min)
PM₁₀ as a function of:	0:15	0:30	0:45	1:00	1:15	1:30	1:45	2:00	2:15	2:30	All
ln(AOD)	0.179 (−1.00)	0.225 (−1.67)	0.28 (2.83)**	0.297 (3.53)**	0.271 (3.56)**	0.248 (3.35)**	0.204 (3.02)**	0.188 (2.81)**	0.165 (2.57)*	0.165 (2.56)*	0.166 (2.58)*
Relative humidity (%)	0.016 (−1.22)	0.009 (−0.9)	−0.004 (−0.58)	−0.004 (−0.64)	−0.003 (−0.5)	0 (−0.03)	0.003 (−0.63)	0.002 (−0.48)	0.003 (−0.76)	0.003 (−0.76)	0.003 (−0.77)
Mean sea level atmospheric pressure (hectopascal)	0.024 (−1.06)	0.035 (2.10)*	0.032 (2.62)*	0.031 (2.82)**	0.026 (2.66)**	0.026 (2.83)**	0.019 (2.09)*	0.019 (2.30)*	0.019 (2.35)*	0.02 (2.46)*	0.02 (2.46)*
Intra-pixel PM₁₀ variance	0.226 (6.66)**	0.195 (7.95)**	0.21 (11.32)**	0.194 (11.50)**	0.213 (14.30)**	0.196 (13.78)**	0.181 (14.02)**	0.19 (14.90)**	0.186 (15.09)**	0.187 (15.42)**	0.187 (15.42)**
Constant	−21.272 (−0.93)	−32.065 (−1.9)	−28.825 (2.31)*	−27.664 (2.45)*	−22.626 (2.27)*	−22.809 (2.42)*	−14.998 (−1.66)	−15.804 (−1.86)	−15.966 (−1.9)	−16.966 (2.02)*	−16.968 (2.02)*
Observations	37	59	94	110	127	142	155	167	174	175	175
R²	0.59	0.59	0.62	0.58	0.66	0.61	0.6	0.6	0.6	0.61	0.61