Finding F-0697

“In the summer, the geometric mean concentration for ozone was higher outdoors than indoors (10.3 μg/m3 vs. 0.12 μg/m3; p < 0.0001); while NO2 was higher indoors than outdoors (8.5 μg/m3 vs. 5.4 μg/m3; p < 0.0001).”

Héroux Predictors of indoor air concentrations in smoking and non-smoking residences… (2010). International journal of environmental research and public health. Page 8. CKB 6699

Structure

Factor: Ozone (O₃)
Setting: dwelling, CA (summer 2007)
Study design: cross-sectional measurement study in Regina, Saskatchewan, Canada: indoor and outdoor air pollutants measured in 106 homes in winter and 111 homes in summer of 2007 (71 homes in both seasons), with air exchange rates, housing characteristics and questionnaires as predictors (class 4)
Effect: median 0.12
Sample: 111 homes
Caveat: geometric mean recorded under measure median; the indoor value is close to the floor of the passive sampler

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