Fri, July 23, 2021: Today will be warm and mostly sunny with a southwest flow. Cloud cover will move across the eastern half of the state in the afternoon. Ozone is expected to be in the Yellow (Moderate) AQI category across much of southern and central Minnesota. Smoke will linger across much much of the state with the highest fine particle levels expected across northern MN. Yellow AQI for fine particles is expected again statewide. A cold front will push through the state tomorrow which could bring another round of smoke into the southern half of the state. Yellow AQI values are expected across much of the state, but the heaviest smoke is expected to impact southern MN. Ozone may reach the Yellow AQI category across much of the state tomorrow due to sunny skies and temperatures in the 90s. High pressure builds on Sunday and winds will become lighter. Yellow AQI for both smoke and ozone is expected for the southern half of the state. Fine particle levels may approach the Orange (USG) category across southwestern MN on Sunday.