Table 2.

Partial^a spearman correlation coefficients for all air pollutant metrics

		CO					NO2					O3						PM2.5
	Metric*	1-hr	24-hr	com	day	night	1-hr	24-hr	com	day	night	8-hr	1-hr	24-hr	com	day	night	1-hr	24-hr	com	day
CO	1-hr	1
	24-hr	0.87	1
	com	0.65	0.85	1
	day	0.53	0.76	0.91	1
	night	0.53	0.71	0.59	0.48	1
NO2	1-hr	0.61	0.55	0.38	0.28	0.38	1
	24-hr	0.62	0.66	0.55	0.44	0.51	0.79	1
	com	0.47	0.56	0.57	0.49	0.41	0.55	0.84	1
	day	0.41	0.50	0.54	0.53	0.34	0.44	0.76	0.90	1
	night	0.47	0.53	0.44	0.31	0.66	0.59	0.78	0.56	0.45	1
O3	8-hr	0.15	0.11	0.02	−0.06	0.14	0.34	0.24	0.12	0.02	0.24	1
	1-hr	0.21	0.19	0.10	0.03	0.19	0.40	0.33	0.21	0.13	0.30	0.93	1
	24-hr	−0.17	−0.22	−0.22	−0.22	−0.15	0.02	−0.15	−0.17	−0.22	−0.11	0.78	0.68	1
	com	0.01	−0.07	−0.20	−0.23	−0.02	0.20	0.01	−0.16	−0.21	0.05	0.83	0.74	0.88	1
	day	0.12	0.06	−0.06	−0.14	0.11	0.31	0.18	0.04	−0.07	0.22	0.95	0.89	0.84	0.91	1
	night	−0.43	−0.50	−0.38	−0.24	−0.63	−0.35	−0.52	−0.37	−0.31	−0.66	0.04	−0.04	0.46	0.22	0.07	1
PM2.5	1-hr	0.46	0.48	0.37	0.31	0.39	0.50	0.53	0.46	0.43	0.42	0.39	0.43	0.15	0.22	0.32	−0.23	1
	24-hr	0.36	0.45	0.37	0.34	0.45	0.42	0.52	0.47	0.45	0.45	0.46	0.49	0.25	0.31	0.41	−0.19	0.82	1
	com	0.31	0.40	0.38	0.34	0.40	0.36	0.47	0.46	0.45	0.42	0.42	0.46	0.21	0.26	0.37	−0.19	0.75	0.94	1
	day	0.21	0.31	0.31	0.33	0.33	0.27	0.37	0.38	0.41	0.33	0.40	0.44	0.24	0.26	0.36	−0.10	0.68	0.91	0.93	1
	night	0.28	0.37	0.31	0.26	0.55	0.33	0.45	0.41	0.37	0.52	0.31	0.32	0.15	0.18	0.28	−0.22	0.62	0.79	0.69	0.60

^*1-hr= 1hour maximum 24-hr=24 hour average com=commute hours:7–10 am and 4–7pm day=workday hours 8am=7pm night=night hours 12 am –6 am

^acontrolling for covariates included in the Poisson regression model (month-year-maximum temperature strata, lag 1–2 moving average minimum temperature, lag 0-1-2 moving average of dew point temperature, day of week, holidays)