How wildfire smoke is erasing years of progress toward cleaning up America's air
A new study finds that smoke from massive wildfires has eroded about a quarter of the air quality gains from the last few decades.
![Smoky haze from wildfires in Canada obscures New York City](https://media.npr.org/assets/img/2023/09/19/gettyimages-1258514923_wide-ef52fb0a57d2c05480ca48883ef7297094e6f70d.jpg?s=600)
A new study finds that smoke from massive wildfires has eroded about a quarter of the air quality gains from the last few decades.
(Image credit: David Dee Delgado/Getty Images)
![](https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=1200143622)