Air and Water Pollution Combined Linked to Higher Memory Disease Risk in Chinese Study

New research using data from 15,071 middle-aged and older adults in China finds that combined exposure to air and surface water pollution is linked to higher odds of newly reported memory-related disease. The study, based on the China Health and Retirement Longitudinal Study, tracked participants from 2013 to 2018 and looked at six air pollutants plus four water quality indicators. The strongest signals came from PM10, ozone, PM2.5, and the water permanganate index. When all exposures were modeled together, the combined mixture odds ratio was 1.44. The researchers also found non-linear dose-response relationships for some pollutants, though no subgroup differences held after statistical correction. The main caveat is that exposures were assigned using province-level annual averages, not personal monitoring, and memory disease cases came from self-reported or proxy-reported physician diagnoses. That makes the findings useful for shaping broader environmental monitoring and policy, but not for estimating individual risk.