Due to China’s implementation of air quality improvement measures [ 41 ], from 2011 to 2018, the concentration of PM 2.5 and its components generally showed a decreasing trend, indicating that the actions were effective.
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Impact of long-term exposure to PM<sub>2.5</sub> and its components on the risk of chronic lung disease in middle-aged and elderly chinese: evidence from a large Chinese population-based cohort.
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