Cognitive impairment associated with individual and joint exposure to PM_2.5 constituents in a Chinese national cohort

Abstract

● A national cohort to assess nexus between cognition function and PM_2.5 constituents.

● Cognitive impairment was related to individual and joint exposure to PM_2.5 constituents.

● BC displayed the highest negative effect on PM_2.5-related cognitive impairment.

● Female, younger, and well-educated individuals were more vulnerable.

Nationwide longitudinal evidence linking cognitive decline with exposure to fine particulate matter (PM_2.5) constituents remains scarce in China. By constructing a dynamic cohort based on the China Health and Retirement Longitudinal Study, we aimed to assess individual and joint associations of PM_2.5 constituents with cognitive function among middle-aged and older adults in China. Linear mixed-effects models incorporated with quantile-based g-computation were applied to investigate individual and joint associations of long-term exposures to PM_2.5 constituents with cognitive function. Among 13,507 respondents, we evaluated 38,950 follow-up records of cognitive function tests. Declines in global cognitive score associated with an interquartile range (IQR) increase in exposure were −1.477 (95% CI: −1.722, −1.232) for nitrate, followed by −1.331 (−1.529, −1.133) for ammonium, −1.033 (−1.184, −0.883) for sulfate, −0.988 (−1.144, −0.832) for organic matter and −0.822 (−0.946, −0.699) for black carbon. An IQR-equivalent increase in joint exposure to these PM_2.5 constituents was associated with a decline of −1.353 (−1.659, −1.048) in global cognitive score. Female, younger, and well-educated individuals were at greater vulnerability to cognitive impairment related to individual and joint exposure to PM_2.5 constituents. This study suggested that later-life exposures to PM_2.5 constituents were associated with cognitive decline in middle-aged and older adults in China.

Graphical abstract

Keywords

Air pollution / PM _2.5 constituents / Cognitive function / Joint exposure / Middle-aged and older adults

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