Wildfires emit a mixture of hazardous compounds that contribute to cardiovascular and respiratory illnesses when people breathe them in.
last summer—a block of hot air sits over an area for days on end. This leads to hot, dry conditions that allow wildfires to spark and spread, and allows air pollutants to build up. In the past four decades, Kalashnikov says, these weather patterns have become more common and persistent during the summer in the western states.
“It’s this perfect storm of things which are all increasing to produce more air pollution and more population exposure to air pollution,” Kalashnikov says. “We can link these changes to increases in the kinds of weather patterns that cause this pollution…and also more severe wildfire years which produce more smoke.”
One limitation of the findings is that the researchers had to rely on a network of stations to monitor air quality that is “relatively sparse” in some parts of the western United States, Kalashnikov and his team acknowledged in the paper. Increasing the number of monitoring stations is vital to get more accurate and detailed estimates, they wrote.
“Exactly why is it that we get these co-occurrences of [fine particulate matter] and ozone on some days but not others, and what is the interplay between wildfire smoke and urban air quality?” Jaffe says. Still, he says, the new paper “is definitely a step forward.”
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