A mild storm system moving into the region is expected to bring some relief from air inversion-plagued northern Utah.
The National Weather Service forecast for Thursday calls for south winds of around 20 mph. That should help clear out automobile and particulate pollution from the Wasatch Front's valleys. Thursday's high temperatures in northern Utah were expected to range into the upper-50s under partly cloudy skies.
The Utah Division of Air Quality saw the approaching air flow as reason to reduce its advisories for Salt Lake and Davis counties to "Yellow," or compromised air quality, on Thursday. The rest of the state was expected to be flying "Green," or satisfactory air quality flags.