Interactive effects of ambient fine particulate matter and ozone on daily mortality in 372 cities: two stage time series analysis.

In sensitivity analysis (see supplementary eTable 4), compared with the main models (lag 0-1), the alternative lags of air pollutants generally yielded slightly smaller but comparable estimates for both PM 2.5 and O 3 , although some marginally statistically significant estimates were observed for O 3 in the 25% lowest fourth of PM 2.5 .

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