With Western wildfires increasing in size, duration and intensity, millions of Americans are now exposed to wildfire smoke each year. In California, 2020 and 2021 were particularly challenging, with a 10-fold increase in fires compared with any time in the state's history. Northern Nevada is positioned to receive much of the smoke from California wildfires, and Reno residents experienced months of smoke-shrouded skies during this time. Now, a new study gives us a deeper look into the potentially hazardous chemicals lurking in this smoke.