TABLE 2.

Results From Stationary and Mobile Monitoring, Adjusted for Temperature and Relative Humidity: Mission Hill Neighborhood, Boston, MA, July–September 2007

	Ultrafine Particles		PM2.5
	Estimate	P	Estimate	P
Vehicle countsa
Total count on Huntington Ave	329.02	.002	5.84 × 10−6	.918
Total count on Tremont/Francis St	369.03	.048	4.17 × 10−4	<.001
Distance from Huntington Ave while on Tremont/Francis St	−49.18	<.001	−6.35 × 10−6	.229
Distance from Tremont/Francis St while on Huntington Ave	−47.38	<.001	−8.23 × 10−7	.912
Backupsb
Backups while on Huntington Ave	495.49	.826	−1.06 × 10−3	.253
Backups while on Tremont/Francis St	5702.82	.003	−4.81 × 10−4	.623
Distance from Huntington Ave while on Tremont/Francis St	−21.48	.014	6.99 × 10−6	.052
Distance from T/F while on Huntington Ave	−14.9	.176	−1.09 × 10−5	.042
Idlingc
Idling while on Huntington Ave	−4705.91	.112	−1.84 × 10−3	.306
Idling while on Tremont/Francis St	9229.91	.01	−1.67 × 10−3	.468
Distance from Huntington Ave while on Tremont/Francis St	−23.97	.006	7.38 × 10−6	.039
Distance from Tremont/Francis St while on Huntington Ave	−19.05	.077	−1.08 × 10−5	.037
Mobile monitoringd
Distance from Tremont/Francis St	−18.49	<.001	2.41 × 10−6	.572
Distance from Huntington Ave	−19.5	<.001	−3.20 × 10−6	.332

Notes. PM_2.5 = fine particulate matter. Vehicle counts refer to number of vehicles per 1-min period, and distance is measured in meters.

^aFor ultrafine particles: n = 1710; R² = 0.08. For PM_2.5: n = 3363; R² = 0.22.

^bFor ultrafine particles: n = 2072; R² = 0.06. For PM_2.5: n = 4126; R² = 0.21.

^cFor ultrafine particles: n = 2076; R² = 0.06. For PM_2.5: n = 4127; R² = 0.21.

^dFor ultrafine particles: n = 3815; R² = 0.11. For PM_2.5: n = 9914; R² = 0.30.