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Indoor ozone exposure and ozone mortality coefficient.

Increases in outdoor ozone concentration have been associated with short-term mortality. However, differences have been reported for the increase in short-term mortality associated with a given increase in ozone concentration (ozone mortality coefficient) between cities. Although ozone concentrations are monitored at central outdoor locations, a large fraction of total ozone exposure occurs indoors. Chen et al (p. 235) studied whether variation in ozone mortality coefficients among U.S. cities might be partly explained by differences in total ozone exposure (from both outdoor and indoor exposures) resulting from the same outdoor ozone concentration. They used average annual air change rates (the overall rate at Which indoor air is replaced with outdoor air) to estimate the change in total ozone exposure per unit change in outdoor ozone exposure (ozone exposure coefficient) for 18 cities that had been included in the National Morbidity and Mortality' Air Pollution Study (NMMAPS). Associations between both parameters and ozone mortality coefficients were compared vi h existing data in the literature. For the 8 NMMAPS cities, the association between ozone mortality coefficients and ozone exposure coefficients was highly significant. Similar associations were observed for another 72 NMMAPS cities. The authors conclude that differences in ozone mortality coefficients among cities appear to partially reflect differences in total ozone exposure that result from differences in air change rates and time spent outdoors.
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Title Annotation:Research
Publication:Environmental Health Perspectives
Article Type:Brief article
Geographic Code:1USA
Date:Feb 1, 2012
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