EnviroNearby

Minnehaha County, South Dakota air quality history

Daily Air Quality Index summaries from EPA monitors in Minnehaha, South Dakota, 1986–2025.

81%
Good days in 2025
36
Median daily AQI, 2025
4
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Minnehaha, South Dakota on 364 days. 294 of those days (81%) were in the Good range, and the median daily AQI was 36. That median is about the same as the typical monitored county in South Dakota (median 35.5 across 10 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 231 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 75% in 1999–2001 versus 76% in 2023–2025.

Years with fewer than 120 monitored days (1993, 1994, 1995, 1996, 1997, 1998…) 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%1986: Good 86 of 88 days1986: Moderate 2 of 88 days19861987: Good 75 of 75 days1988: Good 30 of 30 days1989: Good 53 of 54 days1989: Moderate 1 of 54 days1990: Good 59 of 60 days1990: Moderate 1 of 60 days1991: Good 57 of 59 days1991: Moderate 2 of 59 days19911992: Good 60 of 61 days1992: Moderate 1 of 61 days1993: Good 58 of 59 days1993: Moderate 1 of 59 days1994: Good 61 of 61 days1995: Good 60 of 61 days1995: Moderate 1 of 61 days1996: Good 58 of 59 days1996: Moderate 1 of 59 days19961997: Good 63 of 63 days1998: Good 101 of 102 days1998: Moderate 1 of 102 days1999: Good 234 of 324 days1999: Moderate 90 of 324 days2000: Good 277 of 346 days2000: Moderate 68 of 346 days2000: Unhealthy for Sensitive Groups 1 of 346 days2001: Good 261 of 364 days2001: Moderate 101 of 364 days2001: Unhealthy for Sensitive Groups 2 of 364 days20012002: Good 261 of 338 days2002: Moderate 77 of 338 days2003: Good 290 of 365 days2003: Moderate 74 of 365 days2003: Unhealthy for Sensitive Groups 1 of 365 days2004: Good 294 of 366 days2004: Moderate 72 of 366 days2005: Good 261 of 365 days2005: Moderate 102 of 365 days2005: Unhealthy for Sensitive Groups 2 of 365 days2006: Good 272 of 359 days2006: Moderate 86 of 359 days2006: Unhealthy for Sensitive Groups 1 of 359 days20062007: Good 289 of 364 days2007: Moderate 73 of 364 days2007: Unhealthy for Sensitive Groups 2 of 364 days2008: Good 288 of 365 days2008: Moderate 76 of 365 days2008: Unhealthy for Sensitive Groups 1 of 365 days2009: Good 216 of 365 days2009: Moderate 148 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 190 of 365 days2010: Moderate 174 of 365 days2010: Unhealthy for Sensitive Groups 1 of 365 days2011: Good 217 of 365 days2011: Moderate 147 of 365 days2011: Unhealthy for Sensitive Groups 1 of 365 days20112012: Good 213 of 366 days2012: Moderate 145 of 366 days2012: Unhealthy for Sensitive Groups 7 of 366 days2012: Unhealthy 1 of 366 days2013: Good 206 of 365 days2013: Moderate 159 of 365 days2014: Good 253 of 363 days2014: Moderate 108 of 363 days2014: Unhealthy for Sensitive Groups 2 of 363 days2015: Good 207 of 365 days2015: Moderate 155 of 365 days2015: Unhealthy for Sensitive Groups 3 of 365 days2016: Good 269 of 366 days2016: Moderate 95 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days20162017: Good 287 of 365 days2017: Moderate 78 of 365 days2018: Good 275 of 365 days2018: Moderate 87 of 365 days2018: Unhealthy for Sensitive Groups 3 of 365 days2019: Good 301 of 365 days2019: Moderate 63 of 365 days2019: Unhealthy for Sensitive Groups 1 of 365 days2020: Good 298 of 366 days2020: Moderate 68 of 366 days2021: Good 266 of 349 days2021: Moderate 78 of 349 days2021: Unhealthy for Sensitive Groups 3 of 349 days2021: Unhealthy 2 of 349 days20212022: Good 300 of 365 days2022: Moderate 64 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 235 of 365 days2023: Moderate 103 of 365 days2023: Unhealthy for Sensitive Groups 23 of 365 days2023: Unhealthy 4 of 365 days2024: Good 297 of 365 days2024: Moderate 66 of 365 days2024: Unhealthy for Sensitive Groups 2 of 365 days2025: Good 294 of 364 days2025: Moderate 66 of 364 days2025: Unhealthy for Sensitive Groups 4 of 364 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 year0501001986: 90th percentile AQI 331987: 90th percentile AQI 371988: 90th percentile AQI 411989: 90th percentile AQI 351990: 90th percentile AQI 341991: 90th percentile AQI 371992: 90th percentile AQI 421993: 90th percentile AQI 271994: 90th percentile AQI 391995: 90th percentile AQI 381996: 90th percentile AQI 301997: 90th percentile AQI 331998: 90th percentile AQI 331999: 90th percentile AQI 642000: 90th percentile AQI 642001: 90th percentile AQI 672002: 90th percentile AQI 622003: 90th percentile AQI 612004: 90th percentile AQI 562005: 90th percentile AQI 672006: 90th percentile AQI 672007: 90th percentile AQI 592008: 90th percentile AQI 592009: 90th percentile AQI 662010: 90th percentile AQI 742011: 90th percentile AQI 642012: 90th percentile AQI 802013: 90th percentile AQI 682014: 90th percentile AQI 642015: 90th percentile AQI 642016: 90th percentile AQI 582017: 90th percentile AQI 582018: 90th percentile AQI 622019: 90th percentile AQI 552020: 90th percentile AQI 562021: 90th percentile AQI 612022: 90th percentile AQI 572023: 90th percentile AQI 932024: 90th percentile AQI 572025: 90th percentile AQI 581986: Median AQI 201987: Median AQI 191988: Median AQI 191989: Median AQI 171990: Median AQI 151991: Median AQI 191992: Median AQI 201993: Median AQI 151994: Median AQI 201995: Median AQI 191996: Median AQI 171997: Median AQI 201998: Median AQI 191999: Median AQI 382000: Median AQI 352001: Median AQI 402002: Median AQI 322003: Median AQI 292004: Median AQI 302005: Median AQI 412006: Median AQI 392007: Median AQI 382008: Median AQI 392009: Median AQI 462010: Median AQI 492011: Median AQI 462012: Median AQI 462013: Median AQI 482014: Median AQI 432015: Median AQI 472016: Median AQI 422017: Median AQI 382018: Median AQI 402019: Median AQI 372020: Median AQI 382021: Median AQI 392022: Median AQI 392023: Median AQI 442024: Median AQI 342025: Median AQI 36198619911996200120062011201620212025
  • 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
Ozone23163%
Fine particles (PM2.5)12434%
Coarse particles (PM10)72%
Nitrogen dioxide (NO₂)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253642946640003658125Ozone
20243652976620003457145Ozone
2023365235103234004493181Ozone
20223653006410003957105Ozone
20213492667832003961193Ozone
2020366298680000385690Ozone
20193653016310003755105Ozone
20183652758730004062115Ozone
2017365287780000385897Ozone
20163662699520004258105Ozone
201536520715530004764124PM2.5
201436325310820004364105Ozone
20133652061590000486899PM2.5
201236621314571004680170Ozone
201136521714710004664105PM2.5
201036519017410004974122PM2.5
200936521614810004666122PM2.5
20083652887610003959112Ozone
20073642897320003859139Ozone
20063592728610003967105Ozone
200536526110220004167105Ozone
20043662947200003056100PM2.5
20033652907410002961105NO2
2002338261770000326293PM10
200136426110120004067122Ozone
20003462776810003564101Ozone
1999324234900000386498Ozone
199810210110000193351PM10
1997636300000203348PM10
1996595810000173058PM10
1995616010000193852PM10
1994616100000203943PM10
1993595810000152752PM10
1992616010000204252PM10
1991595720000193755PM10
1990605910000153467PM10
1989545310000173580PM10
1988303000000194147PM10
1987757500000193750PM10
1986888620000203353PM10

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 South Dakota with a similar median AQI in 2025

All monitored counties in South Dakota

Source: U.S. EPA AirData, “Annual AQI by County” files for 1986–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem