Background: Depression in late life has been associated with reduced quality of life and increased mortality. Whether the chronic fine particular matter (PM) and its components exposure are contributed to the older depression symptoms remains unclear.
Method: Middle-aged and older adults (>45 years) were selected from the China Health and Retirement Longitudinal Study during the four waves of interviews. The concentrations of PM and its major constituents were calculated using near real-time data at a spatial resolution of 10 km during the study period. The depressive symptom was evaluated by the Depression Center for Epidemiologic Studies Depression (CES-D)-10 score. The fix-effect model was applied to evaluate the association between PM and its major constituents with depressive symptoms. Three three-step methods were used to explore the modification role of sleep duration against the depressive symptoms caused by PM exposure.
Results: In our study, a total of 52,683 observations of 16,681 middle-aged and older adults were assessed. Each interquartile range (IQR) level of PM concentration exposure was longitudinally associated with a 2.6 % (95 % confidence interval [CI]: 1.3 %, 4.0 %) increase in the depression CES-D-10 score. Regarding the major components of PM, OM, NO, and NH showed the leading toxicity effects, which could increase the depression CES-D-10 score by 2.2 % (95 %CI: 1.0 %, 3.4 %), 2.2 % (0.6 %, 3.9 %), and 2.0 % (95 %CI: 0.6 %, 3.4 %) correspondingly. Besides, males were more susceptible to the worse depressive symptoms caused by PM and its major components exposure than female subpopulations. Shortened sleep duration might be the mediator of PM-associated depressive symptoms.
Conclusion: Our results suggest that long-term exposure to PM and its major components were associated with an increased risk for depressive symptoms in middle-aged and older adults. Reducing the leading components of PM may cost-effectively alleviate the disease burden of depression and promote healthy longevity in heavy pollutant countries.
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