The 49ers were actually playing in Arizona because of COVID restrictions in Santa Clara, not wildfires. One interesting tidbit is the 49ers wore red for the first 2 home games in Arizona before being forced to wear their regular away uniforms against Seattle because they did not bring their white color rush to Arizona, which has ended up being the most recent time they wore their normal away uniforms against Seattle as they always wear the white color rush when playing the Seahawks on the road.