Table 4(a).

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

PM2.5 as a function of:	Interval across satellite crossing time (h: min)
	0:15	0:30	0:45	1:00	1:15	1:30	1:45	2:00	2:15	2:30	All
ln(AOD)	0.458 (3.23)**	0.482 (3.66)**	0.454 (4.24)**	0.369 (4.29)**	0.366 (4.46)**	0.371 (4.85)**	0.336 (4.77)**	0.333 (4.61)**	0.342 (4.93)**	0.352 (4.98)**	0.352 (4.99)**
Relative humidity (%)	0.037 (3.62)**	0.012 (−1.16)	0.01 (−1.32)	0.012 (−1.86)	0.013 (2.09)*	0.015 (2.72)**	0.017 (3.37)**	0.019 (3.98)**	0.016 (3.80)**	0.016 (3.66)**	0.016 (3.66)**
Mean sea level atmospheric pressure (hectopascal)	0.029 (−1.57)	0.054 (3.21)**	0.054 (4.06)**	0.052 (4.67)**	0.051 (4.86)**	0.051 (5.30)**	0.046 (4.92)**	0.047 (5.17)**	0.046 (5.11)**	0.047 (5.10)**	0.047 (5.10)**
Intra-pixel PM2.5 variance	0.205 (10.77)**	0.178 (8.30)**	0.158 (9.40)**	0.144 (9.99)**	0.166 (11.27)**	0.173 (12.12)**	0.167 (12.36)**	0.159 (12.53)**	0.156 (12.65)**	0.162 (13.17)**	0.162 (13.15)**
Constant	−27.198 (−1.46)	−51.383 (3.02)**	−51.683 (3.82)**	−49.588 (4.39)**	−48.25 (4.58)**	−48.432 (5.01)**	−43.471 (4.63)**	−44.843 (4.88)**	−43.664 (4.80)**	−44.513 (4.80)**	−44.525 (4.80)**
Observations	37	58	94	109	126	142	155	167	174	175	175
R2	0.81	0.66	0.61	0.61	0.62	0.63	0.62	0.61	0.6	0.61	0.61