Variable	Good (<30 µg m−3)		Normal (30 µg m−3 ≤ PM10 < 80 µg m−3)		Bad (≥80 µg m−3)
	OLS		OLS		OLS
	Coef.	t	Coef.	t	Coef.	t
Constant	6.377 ***	3.436	4.530 ***	5.4852	−0.830	−0.193
Gu-level weather and atmosphere condition
log_ PM10 concentration	−0.691 ***	−2.647	−0.176 **	−2.318	−1.213 **	−2.224
log_lowest temperature	0.816 ***	3.421	0.259 *	1.922	2.365 **	2.203
Population
log_population density	−0.167	−1.161	−0.242 ***	−3.882	0.274 **	1.969
log_job density	−0.017	−0.283	0.127 ***	3.684	−0.010	−0.129
log_bus ridership	0.269 ***	6.875	0.358 ***	14.837	0.303 ***	6.403
log_subway ridership	0.045 ***	5.495	0.045 ***	10.300	0.053 ***	6.486
Land use
Residential	0.008	0.032	0.350 ***	2.966	0.492 **	2.108
Commercial	0.242	0.941	0.556 ***	4.294	1.070 ***	3.978
Industrial	0.280	0.947	0.307 **	2.028	0.332	1.202
Street type
With sidewalk	0.702 ***	5.145	0.599 ***	7.890	0.936 ***	6.833
Without sidewalk (shared with pedestrians and vehicles)	0.340	1.627	0.525 ***	5.492	0.857 ***	4.901
Street condition
Sidewalk width	0.068 ***	3.053	0.074 ***	7.368	0.118 ***	5.840
# of traffic lanes	0.057 ***	2.641	0.012	1.113	0.024	1.215
Presence of centerline	−0.250 *	−1.658	−0.273 ***	−3.605	−0.233 *	−1.672
Presence of street furniture	−0.278 *	−1.856	−0.017	−0.221	0.202	1.393
Presence of obstacle	0.350 **	2.105	0.454 ***	5.225	0.730 ***	4.488
Presence of braille block	−0.125	−1.465	0.057	1.212	−0.001	−0.006
Presence of street slope	−0.173 *	−1.887	−0.287 ***	−5.421	−0.106	−1.060
Presence of fence	0.316 ***	3.206	0.115 **	2.215	0.027	0.262
Presence of crosswalk	0.345 ***	3.576	0.107 **	2.142	0.241 **	2.481
Summary
N	608		1,874		508
Adjusted R-square	0.425		0.423		0.488
Log likelihood	−805.982		−2443.86		−648.26
Akaike info criterion	1653.96		4929.72		1338.52
Schwarz criterion	1746.58		5045.97		1427.36
Statistics
Moran’s I	9.674 ***		19.758 ***		8.275 ***
Note: The reference group of Land use, Street type and Day of the week are “Green,” “With sidewalk, but shared with bicycles” and “Tuesday,” respectively. * Significant at p < 0.1; ** Significant at p < 0.05; *** Significant at p < 0.01.