Peking University Model Links 25 µg m⁻³ Limit to 233,668 Averted Deaths
A modeling study shows tightening China's PM2.5 standard to 25 µg m⁻³ would cut observed attributable mortality by 16.1%.
Researchers from Peking University Health Science Center and the Chinese Academy of Environmental Planning published a modeling study online on 23 October 2026 in Environmental Science and Ecotechnology, reported by news-medical.net. The team assessed mortality impacts across mainland China under different National Ambient Air Quality Standards compliance scenarios. According to their calculations, full compliance with a 25 µg m⁻³ limit in 2024 would have averted an estimated 233,668 premature deaths (95% UI: 198,354–270,734), which represents a 16.1% reduction from observed levels news-medical.net
news-medical.netnews-medical.netOpen source ↗.
By comparison, maintaining full compliance with the 35 µg m⁻³ standard would have avoided 53,985 deaths (95% UI: 45,992–62,021). Between 2013 and 2024, clean air initiatives in China reduced population-weighted PM2.5 exposure from 62.8 to 29.7 µg m⁻³. The nationally attributable fraction of mortality linked to fine particulate matter declined from 32.5% in 2015 to 22.6% in 2024. Adopting the 25 µg m⁻³ threshold expanded the share of the population living above the regulatory limit from 33% to 65%.
Disease-Specific Outcomes
The health gains calculated under the 25 µg m⁻³ scenario varied significantly across the seven evaluated disease categories. Cause-specific mortality decreased by 22.8% for chronic obstructive pulmonary disease (COPD), 18.4% for stroke, 18.4% for lung cancer, 18.0% for lower respiratory infections, and 16.0% for ischemic heart disease news-medical.net
news-medical.netnews-medical.netOpen source ↗. Reductions were lower for dementia at 1.4% and type 2 diabetes mellitus at 1.1%, though authors noted that dementia estimates require caution due to weaker underlying evidence.
Global Targets and Comparative Models
Full compliance with limits of 35, 30, and 25 µg m⁻³ would increase progress toward the World Health Organization halving target to 66.2%, 72.6%, and 83.4%, respectively. COPD mortality would exceed the 50% halving benchmark under the 25 µg m⁻³ scenario, while dementia and type 2 diabetes would fall short news-medical.net
news-medical.netnews-medical.netOpen source ↗. A sensitivity check using the Global Exposure Mortality Model indicated 3.9 times more averted deaths under the 25 µg m⁻³ target than under the 35 µg m⁻³ threshold.
