EnviroNearby

Anoka County, Minnesota air quality history

Daily Air Quality Index summaries from EPA monitors in Anoka, Minnesota, 1980–2025.

74%
Good days in 2025
38
Median daily AQI, 2025
9
Days above 100 in 2025
363
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Anoka, Minnesota on 363 days. 269 of those days (74%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in Minnesota (median 37 across 21 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 204 days. Across the years with fuller monitoring, the share of Good days fell: an average of 85% in 1980–1982 versus 71% in 2023–2025.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1980: Good 261 of 321 days1980: Moderate 39 of 321 days1980: Unhealthy for Sensitive Groups 16 of 321 days1980: Unhealthy 4 of 321 days1980: Very Unhealthy 1 of 321 days19801981: Good 198 of 228 days1981: Moderate 21 of 228 days1981: Unhealthy for Sensitive Groups 8 of 228 days1981: Unhealthy 1 of 228 days1982: Good 217 of 248 days1982: Moderate 25 of 248 days1982: Unhealthy for Sensitive Groups 5 of 248 days1982: Unhealthy 1 of 248 days1983: Good 289 of 327 days1983: Moderate 27 of 327 days1983: Unhealthy for Sensitive Groups 7 of 327 days1983: Unhealthy 3 of 327 days1983: Very Unhealthy 1 of 327 days1984: Good 333 of 362 days1984: Moderate 22 of 362 days1984: Unhealthy for Sensitive Groups 6 of 362 days1984: Unhealthy 1 of 362 days1985: Good 324 of 351 days1985: Moderate 26 of 351 days1985: Unhealthy for Sensitive Groups 1 of 351 days19851986: Good 338 of 357 days1986: Moderate 17 of 357 days1986: Unhealthy for Sensitive Groups 2 of 357 days1987: Good 304 of 364 days1987: Moderate 51 of 364 days1987: Unhealthy for Sensitive Groups 8 of 364 days1987: Unhealthy 1 of 364 days1988: Good 265 of 356 days1988: Moderate 51 of 356 days1988: Unhealthy for Sensitive Groups 28 of 356 days1988: Unhealthy 11 of 356 days1988: Very Unhealthy 1 of 356 days1989: Good 297 of 365 days1989: Moderate 47 of 365 days1989: Unhealthy for Sensitive Groups 19 of 365 days1989: Unhealthy 2 of 365 days1990: Good 323 of 358 days1990: Moderate 32 of 358 days1990: Unhealthy for Sensitive Groups 3 of 358 days19901991: Good 317 of 360 days1991: Moderate 35 of 360 days1991: Unhealthy for Sensitive Groups 7 of 360 days1991: Unhealthy 1 of 360 days1992: Good 339 of 361 days1992: Moderate 14 of 361 days1992: Unhealthy for Sensitive Groups 7 of 361 days1992: Unhealthy 1 of 361 days1993: Good 355 of 365 days1993: Moderate 10 of 365 days1994: Good 337 of 361 days1994: Moderate 19 of 361 days1994: Unhealthy for Sensitive Groups 5 of 361 days1995: Good 309 of 349 days1995: Moderate 29 of 349 days1995: Unhealthy for Sensitive Groups 8 of 349 days1995: Unhealthy 3 of 349 days19951996: Good 347 of 360 days1996: Moderate 13 of 360 days1997: Good 330 of 365 days1997: Moderate 28 of 365 days1997: Unhealthy for Sensitive Groups 7 of 365 days1998: Good 311 of 365 days1998: Moderate 48 of 365 days1998: Unhealthy for Sensitive Groups 5 of 365 days1998: Unhealthy 1 of 365 days1999: Good 323 of 365 days1999: Moderate 34 of 365 days1999: Unhealthy for Sensitive Groups 8 of 365 days2000: Good 336 of 366 days2000: Moderate 28 of 366 days2000: Unhealthy for Sensitive Groups 2 of 366 days20002001: Good 327 of 365 days2001: Moderate 30 of 365 days2001: Unhealthy for Sensitive Groups 7 of 365 days2001: Unhealthy 1 of 365 days2002: Good 328 of 365 days2002: Moderate 31 of 365 days2002: Unhealthy for Sensitive Groups 6 of 365 days2003: Good 183 of 365 days2003: Moderate 174 of 365 days2003: Unhealthy for Sensitive Groups 8 of 365 days2004: Good 152 of 366 days2004: Moderate 210 of 366 days2004: Unhealthy for Sensitive Groups 4 of 366 days2005: Good 160 of 365 days2005: Moderate 193 of 365 days2005: Unhealthy for Sensitive Groups 11 of 365 days2005: Unhealthy 1 of 365 days20052006: Good 214 of 365 days2006: Moderate 146 of 365 days2006: Unhealthy for Sensitive Groups 5 of 365 days2007: Good 174 of 365 days2007: Moderate 182 of 365 days2007: Unhealthy for Sensitive Groups 8 of 365 days2007: Unhealthy 1 of 365 days2008: Good 187 of 366 days2008: Moderate 177 of 366 days2008: Unhealthy for Sensitive Groups 2 of 366 days2009: Good 163 of 365 days2009: Moderate 199 of 365 days2009: Unhealthy for Sensitive Groups 3 of 365 days2010: Good 161 of 365 days2010: Moderate 201 of 365 days2010: Unhealthy for Sensitive Groups 3 of 365 days20102011: Good 200 of 365 days2011: Moderate 162 of 365 days2011: Unhealthy for Sensitive Groups 3 of 365 days2012: Good 210 of 366 days2012: Moderate 151 of 366 days2012: Unhealthy for Sensitive Groups 4 of 366 days2012: Unhealthy 1 of 366 days2013: Good 232 of 365 days2013: Moderate 131 of 365 days2013: Unhealthy for Sensitive Groups 2 of 365 days2014: Good 265 of 364 days2014: Moderate 99 of 364 days2015: Good 278 of 365 days2015: Moderate 85 of 365 days2015: Unhealthy for Sensitive Groups 2 of 365 days20152016: Good 291 of 366 days2016: Moderate 74 of 366 days2016: Unhealthy for Sensitive Groups 1 of 366 days2017: Good 239 of 365 days2017: Moderate 126 of 365 days2018: Good 223 of 365 days2018: Moderate 141 of 365 days2018: Unhealthy for Sensitive Groups 1 of 365 days2019: Good 274 of 364 days2019: Moderate 89 of 364 days2019: Unhealthy for Sensitive Groups 1 of 364 days2020: Good 289 of 366 days2020: Moderate 77 of 366 days20202021: Good 258 of 365 days2021: Moderate 100 of 365 days2021: Unhealthy for Sensitive Groups 5 of 365 days2021: Unhealthy 2 of 365 days2022: Good 289 of 365 days2022: Moderate 76 of 365 days2023: Good 217 of 365 days2023: Moderate 131 of 365 days2023: Unhealthy for Sensitive Groups 15 of 365 days2023: Unhealthy 2 of 365 days2024: Good 286 of 366 days2024: Moderate 79 of 366 days2024: Unhealthy for Sensitive Groups 1 of 366 days2025: Good 269 of 363 days2025: Moderate 85 of 363 days2025: Unhealthy for Sensitive Groups 5 of 363 days2025: Unhealthy 4 of 363 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001501980: 90th percentile AQI 801981: 90th percentile AQI 611982: 90th percentile AQI 541983: 90th percentile AQI 541984: 90th percentile AQI 481985: 90th percentile AQI 471986: 90th percentile AQI 441987: 90th percentile AQI 671988: 90th percentile AQI 1081989: 90th percentile AQI 801990: 90th percentile AQI 501991: 90th percentile AQI 541992: 90th percentile AQI 451993: 90th percentile AQI 441994: 90th percentile AQI 481995: 90th percentile AQI 541996: 90th percentile AQI 451997: 90th percentile AQI 501998: 90th percentile AQI 641999: 90th percentile AQI 512000: 90th percentile AQI 482001: 90th percentile AQI 512002: 90th percentile AQI 512003: 90th percentile AQI 792004: 90th percentile AQI 762005: 90th percentile AQI 772006: 90th percentile AQI 692007: 90th percentile AQI 722008: 90th percentile AQI 682009: 90th percentile AQI 752010: 90th percentile AQI 742011: 90th percentile AQI 682012: 90th percentile AQI 672013: 90th percentile AQI 642014: 90th percentile AQI 632015: 90th percentile AQI 562016: 90th percentile AQI 562017: 90th percentile AQI 612018: 90th percentile AQI 662019: 90th percentile AQI 592020: 90th percentile AQI 572021: 90th percentile AQI 682022: 90th percentile AQI 552023: 90th percentile AQI 832024: 90th percentile AQI 582025: 90th percentile AQI 641980: Median AQI 351981: Median AQI 351982: Median AQI 301983: Median AQI 311984: Median AQI 331985: Median AQI 301986: Median AQI 271987: Median AQI 321988: Median AQI 361989: Median AQI 361990: Median AQI 301991: Median AQI 301992: Median AQI 291993: Median AQI 301994: Median AQI 311995: Median AQI 311996: Median AQI 321997: Median AQI 331998: Median AQI 341999: Median AQI 332000: Median AQI 282001: Median AQI 242002: Median AQI 172003: Median AQI 502004: Median AQI 532005: Median AQI 532006: Median AQI 462007: Median AQI 512008: Median AQI 492009: Median AQI 522010: Median AQI 532011: Median AQI 482012: Median AQI 472013: Median AQI 442014: Median AQI 412015: Median AQI 412016: Median AQI 382017: Median AQI 432018: Median AQI 442019: Median AQI 392020: Median AQI 382021: Median AQI 412022: Median AQI 402023: Median AQI 462024: Median AQI 412025: Median AQI 381980198519901995200020052010201520202025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone20456%
Fine particles (PM2.5)15142%
Nitrogen dioxide (NO₂)82%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253632698554003864177Ozone
20243662867910004158125Ozone
2023365217131152004683175Ozone
2022365289760000405593Ozone
202136525810052004168162Ozone
2020366289770000385787Ozone
20193642748910003959122Ozone
201836522314110004466115PM2.5
20173652391260000436190PM2.5
20163662917410003856145Ozone
20153652788520004156105Ozone
2014364265990000416393Ozone
201336523213120004464126Ozone
201236621015141004767185PM2.5
201136520016230004868133PM2.5
201036516120130005374117PM2.5
200936516319930005275112PM2.5
200836618717720004968130PM2.5
200736517418281005172151PM2.5
200636521414650004669115PM2.5
2005365160193111005377153PM2.5
200436615221040005376121PM2.5
200336518317480005079150PM2.5
20023653283160001751133CO
20013653273071002451192Ozone
20003663362820002848129Ozone
19993653233480003351122Ozone
19983653114851003464151Ozone
19973653302870003350133Ozone
19963603471300003245100Ozone
19953493092983003154182Ozone
19943613371950003148136Ozone
1993365355100000304497Ozone
19923613391471002945164Ozone
19913603173571003054154Ozone
19903583233230003050129Ozone
198936529747192003680164Ozone
19883562655128111036108203Ozone
19873643045181003267159Ozone
19863573381720002744115Ozone
19853513242610003047108Ozone
19843623332261003348172Ozone
19833272892773103154204Ozone
19822482172551003054172Ozone
19812281982181003561174Ozone
198032126139164103580204Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Minnesota with a similar median AQI in 2025

All monitored counties in Minnesota

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem