In the third installment of the Chico Enterprise-Record's five-part series on toxic wildfire smoke and its effect on people’s health, host Robin Epley examines the long-term — and often fatal — health effects that wildfire smoke causes, and why no one knows exactly what was in the air that fateful day.

Follow along at chicoer.com/inhaled for all of our stories.

Music by Broke For Free and Chris Zabrinski, courtesy of the Free Music Archive. Our thanks to North State Public Radio for production assistance.