Air pollution may contribute to Alzheimer’s and dementia risk – here's what we're learning from brain scans

... The U.S. government had an opportunity to strengthen those standards in 2020, a move that EPA scientists explained could prevent thousands of premature deaths from health risks such as heart disease. Scientists advocated tougher standards, citing other health problems linked to PM2.5. However, EPA Administrator Andrew Wheeler declined, announcing on Dec. 7 that the standards would remain unchanged...

https://theconversation.com/air-pollution-may-contribute-to-alzheimers-and-dementia-risk-heres-what-were-learning-from-brain-scans-148776