PM 10 showed a trend of initially rapid then slower increase (P for overall < 0.001, P for nonlinear < 0.001).
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Effects of air pollution and noise exposure on occupational hearing loss in oil workers: a prospective cohort study.
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The sentences
The results demonstrated significant differences in the interaction effects of noise with different air pollutants, and after adjusting for covariates, some effects showed a decreasing trend.