Air pollution and cognitive function: the potential protective effect of physical activity.

Area of Science:

• Environmental Health
• Neuroscience
• Public Health

Background:

• Air pollution poses a significant threat to cognitive health.
• Physical activity (PA) is known to have numerous health benefits, but its role in mitigating pollution-related cognitive decline is not fully understood.

Purpose of the Study:

• To investigate the association between exposure to major air pollutants and cognitive function in older adults.
• To examine whether physical activity moderates the impact of air pollution on cognitive function.

Main Methods:

• Utilized data from the 2018 China Health and Retirement Longitudinal Study (CHARLS) with 17,734 participants aged 45+.
• Assessed cognitive function using the Health and Retirement Study (HRS) approach.
• Employed a two-stage least squares method with the ventilation coefficient as an instrumental variable to estimate the impact of particulate matter (PM1, PM2.5, PM10), nitrogen dioxide (NO2), sulfur dioxide (SO2), and ozone (O3) on cognition.

Main Results:

• All measured air pollutants were significantly associated with decreased cognitive function.
• An interquartile range (IQR) increase in PM1, PM2.5, PM10, NO2, SO2, and O3 corresponded to cognitive function decreases of -0.45, -0.43, -0.53, -0.57, -0.47, and -1.06 points, respectively.
• Higher levels of physical activity significantly moderated the negative association between air pollution and cognitive function, indicating a protective effect.

Conclusions:

• Air pollution adversely affects cognitive function in older adults.
• Physical activity may serve as a protective factor against the cognitive decline induced by air pollution.
• Public health strategies should consider promoting physical activity alongside pollution reduction measures to preserve cognitive health.