The NFL's season-opening slate on Sunday may already be in danger as wildfires continue to burn across the west coast.
Officials from the league and San Francisco 49ers are monitoring the air quality around the Bay Area as the Niners prepare to host the Arizona Cardinals this weekend. On Friday, the air quality index rated at 194. The threshold for canceling practices or postponing games is 200.
"If it gets to 200 that would be a huge deal," San Francisco coach Kyle Shanahan told reporters. "I know when it's above 150 that does affect a certain group of people that happen to be higher risk, pre-existing conditions, if it got above 150 you could lose a few players, but 200 is the mark where you can't go out there.