. Author manuscript; available in PMC: 2021 Dec 29.

Published in final edited form as: J Urban Aff. 2020 Jul 7;43(8):10.1080/07352166.2020.1734013. doi: 10.1080/07352166.2020.1734013

Table A1.

Summary characteristics of pollutants by school attendance scenario and microenvironment

	Mean daily concentration (μg/m³)^†
	benzene	CO	NOx	PM_2.5	OC	EC
Walk to Local School
AM Commute	0.022	14	4.7	0.17	0.057	0.085
Unload at School	0.12	79	27	0.97	0.33	0.49
In-School	0.0051	3.3	1.1	0.012	0.0039	0.0058
Load at School	0.055	35	11	0.38	0.12	0.20
PM Commute	0.014	8.6	2.5	0.091	0.028	0.047
Bus to Distant School
AM Commute	0.13	89	24	0.92	0.36	0.41
Unload at School	0.061	41	11	0.48	0.18	0.20
In-School	0.0027	1.8	0.44	0.0059	0.0022	0.0025
Load at School	0.029	20	4.5	0.19	0.068	0.084
PM Commute	0.084	58	13	0.49	0.17	0.23
Drive to Distant School
AM Commute	0.16	37	7.7	0.27	0.10	0.12
Unload at School	0.061	41	11	0.48	0.18	0.20
In-School	0.0027	1.8	0.44	0.0059	0.0020	0.0025
Load at School	0.029	20	4.5	0.19	0.068	0.084
PM Commute	0.11	26	4.7	0.15	0.054	0.069

^†

All scenarios include vehicle idling.