SALT LAKE CITY — The wall of smoke that swept into northern Utah Friday morning arrived so suddenly, FOX 13's phones were flooded with callers wondering what was burning nearby.
WATCH: Doctor warns of health dangers from Utah's poor air quality
The answer: Nothing... unless you consider California and west-central Idaho nearby.
READ: Utah 911 calls make big jump during wildfire smoke invasion
Utah had the usual unhealthy haze from California fires already, then swirling winds moved into a pattern that circled that recycled smoke up through Wyoming, Montana and down through Idaho where several massive fires turned the usual into something very unusual.
