. Author manuscript; available in PMC: 2019 Dec 10.

Published in final edited form as: Eur Respir J. 2019 Jan 3;53(1):1800612. doi: 10.1183/13993003.00612-2018

TABLE 2.

Home address temperature, air pollution and relative humidity on the day of the study visit, stratified by season

	Total observations N^#	Winter		Spring		Summer		Autumn
	Total observations N^#	n	Mean±sd	n	Mean±sd	n	Mean±sd	n	Mean±sd
Temperature °C	9150	2088	4.01±3.7	2418	9.9±4.1	2322	17.2±2.7	2322	12.0±3.7
RH %	9144	2088	60.8±15.5	2418	64.9±18.3	2316	71.1±14.0	2322	69.7±13.7
PM_2.5 µg·m⁻³	3047	727	8.8±4.3	824	8.8±4.0	767	11.5±6.5	729	8.6±5.1
NO₂ ppb^¶	3076	727	21.8±7.3	824	19.5±5.9	789	17.0±5.0	736	17.7±5.8
O₃ ppb⁺	1550			546	30.6±8.7	762	30.0±10.0	242	19.7±6.8

RH: relative humidity; PM_2.5: particles with a diameter of <2.5 µm; NO₂: nitrogen dioxide; O₃: ozone.

^#:

9150 observations are reported from 5896 participants residing in the Northeastern US;

^¶:

air pollution data reported here is for nonsmoking participants living within 40 km of the Harvard Supersite Monitor in Boston with pollution levels within US Environmental Protection Agency (EPA) standards;

^+:

ozone data is reported during the EPA ozone monitoring season for Massachusetts (April–September).