If you've stepped outside in Sioux Falls lately and noticed hazy skies, reduced visibility, or the smell of smoke in the air, you're not imagining things. The smoky conditions aren't coming from local fires; they're drifting in from massive wildfires burning hundreds of miles away. The smoke and hazy skies in Sioux Falls are primarily drifting down from massive wildfires burning across western Canada (particularly Alberta and British Columbia) and parts of the western United States, such as Oregon and other western states. According to the Watch Duty App, there are numerous fires burning in the western parts of the United States. Fires: Watch Duty App U.S.