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. 2016 Mar 31;6:23792. doi: 10.1038/srep23792

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Red triangle: event group; blue circle: no-event group. (a) ozone mean concentrations of heat wave group and no heat wave group; (b) PM_2.5 mean concentrations of temperature inversion group and no temperature inversion group; (c) PM_2.5 mean concentrations of atmospheric stagnation group and no atmospheric stagnation group.