EnviroNearby

Scott County, Minnesota air quality history

Daily Air Quality Index summaries from EPA monitors in Scott, Minnesota, 2000–2025.

73%
Good days in 2025
38
Median daily AQI, 2025
8
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Scott, Minnesota on 365 days. 266 of those days (73%) 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 216 days. Across the years with fuller monitoring, the share of Good days fell: an average of 73% in 2002–2004 versus 64% in 2023–2025.

Years with fewer than 120 monitored days (2000, 2001) are shown in the table but left out of comparisons and trend statements.

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%2000: Good 41 of 85 days2000: Moderate 42 of 85 days2000: Unhealthy for Sensitive Groups 2 of 85 days20002001: Good 48 of 98 days2001: Moderate 50 of 98 days2002: Good 119 of 186 days2002: Moderate 64 of 186 days2002: Unhealthy for Sensitive Groups 3 of 186 days20022003: Good 166 of 238 days2003: Moderate 70 of 238 days2003: Unhealthy for Sensitive Groups 2 of 238 days2004: Good 201 of 238 days2004: Moderate 37 of 238 days20042005: Good 160 of 240 days2005: Moderate 73 of 240 days2005: Unhealthy for Sensitive Groups 6 of 240 days2005: Unhealthy 1 of 240 days2006: Good 174 of 241 days2006: Moderate 66 of 241 days2006: Unhealthy for Sensitive Groups 1 of 241 days20062007: Good 169 of 240 days2007: Moderate 67 of 240 days2007: Unhealthy for Sensitive Groups 4 of 240 days2008: Good 170 of 237 days2008: Moderate 66 of 237 days2008: Unhealthy for Sensitive Groups 1 of 237 days20082009: Good 192 of 243 days2009: Moderate 49 of 243 days2009: Unhealthy for Sensitive Groups 2 of 243 days2010: Good 189 of 242 days2010: Moderate 51 of 242 days2010: Unhealthy for Sensitive Groups 2 of 242 days20102011: Good 214 of 252 days2011: Moderate 37 of 252 days2011: Unhealthy for Sensitive Groups 1 of 252 days2012: Good 190 of 267 days2012: Moderate 75 of 267 days2012: Unhealthy for Sensitive Groups 2 of 267 days20122013: Good 197 of 261 days2013: Moderate 63 of 261 days2013: Unhealthy for Sensitive Groups 1 of 261 days2014: Good 255 of 306 days2014: Moderate 51 of 306 days20142015: Good 331 of 364 days2015: Moderate 33 of 364 days2016: Good 328 of 361 days2016: Moderate 33 of 361 days20162017: Good 321 of 363 days2017: Moderate 42 of 363 days2018: Good 306 of 357 days2018: Moderate 49 of 357 days2018: Unhealthy for Sensitive Groups 2 of 357 days20182019: Good 273 of 365 days2019: Moderate 92 of 365 days2020: Good 307 of 365 days2020: Moderate 57 of 365 days2020: Unhealthy for Sensitive Groups 1 of 365 days20202021: Good 263 of 351 days2021: Moderate 88 of 351 days2022: Good 282 of 365 days2022: Moderate 83 of 365 days20222023: Good 173 of 365 days2023: Moderate 175 of 365 days2023: Unhealthy for Sensitive Groups 12 of 365 days2023: Unhealthy 5 of 365 days2024: Good 258 of 366 days2024: Moderate 107 of 366 days2024: Unhealthy for Sensitive Groups 1 of 366 days20242025: Good 266 of 365 days2025: Moderate 91 of 365 days2025: Unhealthy for Sensitive Groups 4 of 365 days2025: Unhealthy 4 of 365 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 year0501002000: 90th percentile AQI 802001: 90th percentile AQI 722002: 90th percentile AQI 662003: 90th percentile AQI 662004: 90th percentile AQI 582005: 90th percentile AQI 742006: 90th percentile AQI 642007: 90th percentile AQI 672008: 90th percentile AQI 612009: 90th percentile AQI 612010: 90th percentile AQI 582011: 90th percentile AQI 542012: 90th percentile AQI 642013: 90th percentile AQI 612014: 90th percentile AQI 562015: 90th percentile AQI 502016: 90th percentile AQI 502017: 90th percentile AQI 522018: 90th percentile AQI 562019: 90th percentile AQI 582020: 90th percentile AQI 542021: 90th percentile AQI 612022: 90th percentile AQI 572023: 90th percentile AQI 882024: 90th percentile AQI 602025: 90th percentile AQI 642000: Median AQI 512001: Median AQI 512002: Median AQI 432003: Median AQI 432004: Median AQI 382005: Median AQI 442006: Median AQI 442007: Median AQI 432008: Median AQI 432009: Median AQI 402010: Median AQI 382011: Median AQI 392012: Median AQI 422013: Median AQI 422014: Median AQI 362015: Median AQI 342016: Median AQI 322017: Median AQI 342018: Median AQI 372019: Median AQI 382020: Median AQI 352021: Median AQI 392022: Median AQI 422023: Median AQI 512024: Median AQI 422025: Median AQI 3820002002200420062008201020122014201620182020202220242025
  • 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)21659%
Ozone14941%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652669144003864172PM2.5
202436625810710004260138PM2.5
2023365173175125005188179PM2.5
2022365282830000425789Ozone
2021351263880000396198Ozone
20203653075710003554121Ozone
2019365273920000385893Ozone
20183573064920003756112Ozone
2017363321420000345287Ozone
2016361328330000325093Ozone
2015364331330000345090Ozone
2014306255510000365690Ozone
20132611976310004261108Ozone
20122671907520004264119Ozone
20112522143710003954101Ozone
20102421895120003858120Ozone
20092431924920004061115Ozone
20082371706610004361114Ozone
20072401696740004367132Ozone
20062411746610004464101Ozone
20052401607361004474156Ozone
2004238201370000385891Ozone
20032381667020004366126Ozone
20021861196430004366108PM2.5
20019848500000517287PM2.5
200085414220005180106PM2.5

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 2000–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem