California's Central Valley Copes With Wildfire Smoke

Smoke from wildfires continues to clog the sky across the West, blotting out mountains and city skylines from Oregon to Colorado. As large cities deal with unhealthy air for a second summer in a row, experts warn that it could cause long-term health problems.

Alex Hall (@chalexhall) from KQED explains why those who live and work in California's Central Valley are bearing the brunt.