Hennepin County, MN / Air
How many bad-air days did Hennepin County have?
2025 · data family: airdata.dev
More bad-air days than usual
10daysBad-air days in 2025
- Average of the ten years before: 3.3 days (2015–2024)
- Fine particles (PM2.5, including wildfire smoke) were the main pollutant on 78% of days, ozone on 17%
Show the numbers (46 rows)
| Year | Bad-air days |
|---|---|
| 2025 | 10 days |
| 2024 | 4 days |
| 2023 | 17 days |
| 2022 | 0 days |
| 2021 | 3 days |
| 2020 | 2 days |
| 2019 | 0 days |
| 2018 | 1 days |
| 2017 | 1 days |
| 2016 | 2 days |
| 2015 | 3 days |
| 2014 | 0 days |
| 2013 | 0 days |
| 2012 | 1 days |
| 2011 | 0 days |
| 2010 | 3 days |
| 2009 | 3 days |
| 2008 | 4 days |
| 2007 | 5 days |
| 2006 | 2 days |
| 2005 | 6 days |
| 2004 | 3 days |
| 2003 | 4 days |
| 2002 | 1 days |
| 2001 | 5 days |
| 2000 | 9 days |
| 1999 | 2 days |
| 1998 | 2 days |
| 1997 | 0 days |
| 1996 | 0 days |
| 1995 | 0 days |
| 1994 | 0 days |
| 1993 | 2 days |
| 1992 | 2 days |
| 1991 | 1 days |
| 1990 | 2 days |
| 1989 | 9 days |
| 1988 | 13 days |
| 1987 | 6 days |
| 1986 | 3 days |
| 1985 | 0 days |
| 1984 | 0 days |
| 1983 | 2 days |
| 1982 | 0 days |
| 1981 | 9 days |
| 1980 | 19 days |
- Good211
- Moderate144
- Unhealthy for sensitive groups4
- Unhealthy6
- Very unhealthy0
- Hazardous0
What this can't tell you
- The county's worst monitor sets each day's AQI, so a reading near a highway can stand for the whole county.
- 2026 counts are partial and include data EPA has not finished validating.
How the answer is decided
A bad-air day has an AQI above 100. 2025 is compared with the average of the ten years before: a difference of more than a quarter of that average (and at least three days) is 'more' or 'fewer'.
Sources
- EPA Air Quality System, annual AQI by county (U.S. public domain)
- Built 2026-10-24. Download this answer (JSON)