In a recent study from Peking University Health Science Center, doctoral student Kang Ning and colleagues found that air pollution reductions alone cannot offset the impact of rapid population aging on dementia deaths in China. The study has been published in The Lancet Healthy Longevity.
The research, titled “Trends of PM2.5-attributable dementia deaths in the context of population ageing in China, 2000–60: a health impact assessment,” analyzed historical data (2000–2024) and projected trends to 2060 under five policy scenarios.
Although China’s clean air policies have substantially lowered PM2.5 exposure over the past decade, the study found that dementia-related deaths linked to air pollution have continued to rise.
Researchers identified population aging as the main reason for this trend. While lower PM2.5 levels have brought clear health benefits, the rapid growth of China’s older population has increased the number of people vulnerable to dementia, offsetting much of the progress made through cleaner air. Future projections indicate that sustained air quality improvement is essential, but halting the upward trend requires coordination of clean air policies with carbon neutrality efforts.
A related commentary in The Lancet Healthy Longevity by Bin Jalaludin and Zeng Xiaowen notes that the PM2.5-dementia risk relationship is non-linear, and that health benefits of reducing PM2.5 may be limited when “most of the reductions in PM2.5 concentrations occur within the high-concentration plateau, where risk reductions are marginal.” The authors also emphasize the need for wider public health measures, including healthy aging, dementia prevention, early screening and chronic disease treatment.
The study suggests that, ultimately, stronger action on pollution and carbon emissions, combined with aging-focused health strategies, will be needed to protect public health in the decades ahead.
More information
Ning Kang et al, Trends of PM2.5-attributable dementia deaths in the context of population ageing in China, 2000–60: a health impact assessment, The Lancet Healthy Longevity (2026). DOI: 10.1016/j.lanhl.2026.100841
Xiao-Wen Zeng et al, Air pollution, population ageing, and dementia burden in China, The Lancet Healthy Longevity (2026). DOI: 10.1016/j.lanhl.2026.100844
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