Increasingly intense wildfires that have scorched forests from California to Australia are stoking worry about long-term health impacts from smoke exposure in affected cities and towns.
In the Sierra Nevada foothills town of Paradise, California, where a fire in 2018 killed 85 people and destroyed 14,000 homes, researchers are tracking respiratory problems suffered by survivors and people in downwind communities.
The work has far-reaching implications as climate change turns some regions of the globe drier and more fire-prone. Smoke from major wildfires can travel thousands of miles and affect millions of people.