The C–R curve for O3 and all-cause mortality was fitted using a natural cubic spline. A nonlinear association between long-term O3 exposure and mortality risk (P for nonlinearity 0.001) was observed ...
Overall hypertension (a-c) and essential hypertension (d-f) hospitalization risk from 1-year, 2-year, and 3-year PM 1 exposure.
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