EnviroNearby

Becker County, Minnesota air quality history

Daily Air Quality Index summaries from EPA monitors in Becker, Minnesota, 2005–2025.

74%
Good days in 2025
38
Median daily AQI, 2025
11
Days above 100 in 2025
315
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Becker, Minnesota on 315 days. 233 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 fine particles (PM2.5) on 173 days. Across the years with fuller monitoring, the share of Good days rose: an average of 62% in 2005–2007 versus 73% 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%2005: Good 163 of 267 days2005: Moderate 104 of 267 days20052006: Good 221 of 356 days2006: Moderate 135 of 356 days2007: Good 223 of 356 days2007: Moderate 127 of 356 days2007: Unhealthy for Sensitive Groups 5 of 356 days2007: Unhealthy 1 of 356 days20072008: Good 293 of 363 days2008: Moderate 70 of 363 days2009: Good 274 of 339 days2009: Moderate 64 of 339 days2009: Unhealthy for Sensitive Groups 1 of 339 days20092010: Good 280 of 358 days2010: Moderate 78 of 358 days2011: Good 294 of 357 days2011: Moderate 63 of 357 days20112012: Good 253 of 343 days2012: Moderate 89 of 343 days2012: Unhealthy for Sensitive Groups 1 of 343 days2013: Good 281 of 352 days2013: Moderate 71 of 352 days20132014: Good 273 of 346 days2014: Moderate 73 of 346 days2015: Good 293 of 358 days2015: Moderate 63 of 358 days2015: Unhealthy for Sensitive Groups 2 of 358 days20152016: Good 324 of 361 days2016: Moderate 37 of 361 days2017: Good 322 of 364 days2017: Moderate 42 of 364 days20172018: Good 301 of 358 days2018: Moderate 57 of 358 days2019: Good 325 of 360 days2019: Moderate 34 of 360 days2019: Unhealthy for Sensitive Groups 1 of 360 days20192020: Good 325 of 366 days2020: Moderate 40 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days2021: Good 147 of 357 days2021: Moderate 199 of 357 days2021: Unhealthy for Sensitive Groups 6 of 357 days2021: Unhealthy 4 of 357 days2021: Very Unhealthy 1 of 357 days20212022: Good 321 of 354 days2022: Moderate 32 of 354 days2022: Unhealthy for Sensitive Groups 1 of 354 days2023: Good 224 of 365 days2023: Moderate 133 of 365 days2023: Unhealthy for Sensitive Groups 6 of 365 days2023: Unhealthy 2 of 365 days20232024: Good 304 of 365 days2024: Moderate 59 of 365 days2024: Unhealthy for Sensitive Groups 1 of 365 days2024: Unhealthy 1 of 365 days2025: Good 233 of 315 days2025: Moderate 71 of 315 days2025: Unhealthy for Sensitive Groups 5 of 315 days2025: Unhealthy 6 of 315 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 year0501002005: 90th percentile AQI 682006: 90th percentile AQI 632007: 90th percentile AQI 622008: 90th percentile AQI 572009: 90th percentile AQI 562010: 90th percentile AQI 582011: 90th percentile AQI 542012: 90th percentile AQI 612013: 90th percentile AQI 572014: 90th percentile AQI 542015: 90th percentile AQI 552016: 90th percentile AQI 512017: 90th percentile AQI 522018: 90th percentile AQI 552019: 90th percentile AQI 502020: 90th percentile AQI 512021: 90th percentile AQI 722022: 90th percentile AQI 492023: 90th percentile AQI 732024: 90th percentile AQI 542025: 90th percentile AQI 732005: Median AQI 452006: Median AQI 462007: Median AQI 452008: Median AQI 372009: Median AQI 342010: Median AQI 372011: Median AQI 362012: Median AQI 412013: Median AQI 392014: Median AQI 362015: Median AQI 362016: Median AQI 292017: Median AQI 352018: Median AQI 352019: Median AQI 312020: Median AQI 342021: Median AQI 522022: Median AQI 362023: Median AQI 442024: Median AQI 362025: Median AQI 3820052007200920112013201520172019202120232025
  • 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
Fine particles (PM2.5)17355%
Ozone14245%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253152337156003873185PM2.5
20243653045911003654152PM2.5
202336522413362004473173PM2.5
20223543213210003649125PM2.5
202135714719964105272208PM2.5
20203663254010003451101Ozone
20193603253410003150105PM2.5
20183583015700003555100PM2.5
2017364322420000355289PM2.5
2016361324370000295190Ozone
20153582936320003655130Ozone
2014346273730000365497PM2.5
2013352281710000395780Ozone
20123432538910004161108Ozone
20113572946300003654100PM2.5
20103582807800003758100PM2.5
20093392746410003456109PM2.5
2008363293700000375790PM2.5
200735622312751004562154PM2.5
200635622113500004663100PM2.5
200526716310400004568100PM2.5

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 2005–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem