In contrast, the curves for O 3 and PM 2.5 showed a decreasing trend, with RR < 1 at concentrations above the median levels (O 3 ≈ 55 μg/m 3 , PM 2.5 ≈ 20 μg/m 3 ).
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Spatiotemporal Distribution of Hand, Foot, and Mouth Disease and the Influence of Air Pollutants and Socioeconomic Factors on Incidence in Fujian, China.
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