Year: 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 Month: January February March April May June July August September October November December Site: All Sites Apple Valley Blaine Brainerd Detroit Lakes Duluth WDSE East Bethel Ely Fond du Lac Grand Portage Lakeville - Near Road Leech Lake Nation: Cass Lake Marine on St. Croix Marshall Mille Lacs Minneapolis - Bottineau/Marshall Terrace Minneapolis - Lowry Ave Minneapolis - Near Road Minneapolis - Phillips Minneapolis-Pacific St Red Lake Rochester Shakopee St. Cloud St. Michael St. Paul - Downtown St. Paul - Harding H.S. Stanton Virginia West Duluth Pollutant: Maximum AQI Ozone PM2.5