Increase in wildfires causing bad air days in US Northwest to get worse over the past 28 years

A pair of researchers with the University of Washington has found that an increase in wildfire size and duration over the past 28 years has led to worsening bad air days in the U.S. Northwest. In their paper published in Proceedings of the National Academy of Sciences, Crystal McClure and Daniel Jaffe describe their study and what their results mean for people living in affected areas. Over the past quarter-century, wildfires (unplanned fires burning in forests or other areas) in many parts of the western United States have become larger and longer-lasting than they were in earlier years. Many environmental scientists have suggested this is due to global warming. Prior research has shown that such fires carry fine particulate matter into the air, and that many people can be harmed by breathing such particles. Those with lung conditions such as COPD or asthma, for example, can suffer problems [...]