It was only a few weeks ago that wildfires drove particle pollution to dangerously high levels in many parts of the San Joaquin Valley and mountain areas, and it could happen again before wildfire season is over. Particulate matter, also known as PM, is a major health risk: It’s known to cause asthma attacks and other respiratory flare-ups in the short term, and exposure over the long term has been associated with reduced immune function and cardiovascular problems. Now, a growing body of research is linking PM and other air pollutants to problems with another part of the body: The brain. Two recent wide-reaching reports associate the pollutant with a decline in cognitive function: One a peer-reviewed study in the research journal Proceedings of the National Academy of Sciences , and the other a working paper by the National Bureau of Economic Research . To explain these studies we spoke with Dr. John Balmes, a pulmonary physician and environmental health researcher with the University
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