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. 2008 Feb 22;116(5):631–636. doi: 10.1289/ehp.10757

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HRs for witnessed non-DOA OHCAs by lagged PM_2.5 exposure. The HR shown is for a 10-μg/m³ increase in PM_2.5 exposure. Lag0 indicates exposure determined during the hour of the cardiac arrest, lag1 indicates exposure determined 1 hr before the cardiac arrest, etc. Lag03 is the average exposure for the hour of the cardiac arrest and 3 hr preceding. Lag07 is the average exposure for the hour of the cardiac arrest and the 7 hr preceding. Lag023 is the average exposure for the hour of the cardiac arrest and the 23 hr preceding. Error bars indicate 95% CIs.