EnviroNearby

Genesee County, Michigan air quality history

Daily Air Quality Index summaries from EPA monitors in Genesee, Michigan, 1980–2025.

83%
Good days in 2025
38
Median daily AQI, 2025
3
Days above 100 in 2025
303
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Genesee, Michigan on 303 days. 252 of those days (83%) were in the Good range, and the median daily AQI was 38. That median is about the same as the typical monitored county in Michigan (median 39 across 26 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 220 days. Across the years with fuller monitoring, the share of Good days fell: an average of 83% in 1980–1982 versus 74% 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 286 of 334 days1980: Moderate 29 of 334 days1980: Unhealthy for Sensitive Groups 14 of 334 days1980: Unhealthy 5 of 334 days19801981: Good 312 of 363 days1981: Moderate 33 of 363 days1981: Unhealthy for Sensitive Groups 14 of 363 days1981: Unhealthy 4 of 363 days1982: Good 223 of 289 days1982: Moderate 37 of 289 days1982: Unhealthy for Sensitive Groups 20 of 289 days1982: Unhealthy 8 of 289 days1982: Very Unhealthy 1 of 289 days1983: Good 206 of 265 days1983: Moderate 36 of 265 days1983: Unhealthy for Sensitive Groups 13 of 265 days1983: Unhealthy 9 of 265 days1983: Very Unhealthy 1 of 265 days1984: Good 165 of 213 days1984: Moderate 30 of 213 days1984: Unhealthy for Sensitive Groups 18 of 213 days1985: Good 178 of 223 days1985: Moderate 38 of 223 days1985: Unhealthy for Sensitive Groups 7 of 223 days19851986: Good 201 of 237 days1986: Moderate 25 of 237 days1986: Unhealthy for Sensitive Groups 9 of 237 days1986: Unhealthy 2 of 237 days1987: Good 164 of 226 days1987: Moderate 46 of 226 days1987: Unhealthy for Sensitive Groups 12 of 226 days1987: Unhealthy 3 of 226 days1987: Very Unhealthy 1 of 226 days1988: Good 155 of 228 days1988: Moderate 39 of 228 days1988: Unhealthy for Sensitive Groups 16 of 228 days1988: Unhealthy 15 of 228 days1988: Very Unhealthy 3 of 228 days1989: Good 162 of 236 days1989: Moderate 60 of 236 days1989: Unhealthy for Sensitive Groups 12 of 236 days1989: Unhealthy 2 of 236 days1990: Good 179 of 238 days1990: Moderate 40 of 238 days1990: Unhealthy for Sensitive Groups 17 of 238 days1990: Unhealthy 2 of 238 days19901991: Good 167 of 237 days1991: Moderate 39 of 237 days1991: Unhealthy for Sensitive Groups 24 of 237 days1991: Unhealthy 7 of 237 days1992: Good 180 of 213 days1992: Moderate 25 of 213 days1992: Unhealthy for Sensitive Groups 7 of 213 days1992: Unhealthy 1 of 213 days1993: Good 174 of 213 days1993: Moderate 35 of 213 days1993: Unhealthy for Sensitive Groups 1 of 213 days1993: Unhealthy 2 of 213 days1993: Very Unhealthy 1 of 213 days1994: Good 162 of 210 days1994: Moderate 35 of 210 days1994: Unhealthy for Sensitive Groups 11 of 210 days1994: Unhealthy 2 of 210 days1995: Good 165 of 209 days1995: Moderate 31 of 209 days1995: Unhealthy for Sensitive Groups 12 of 209 days1995: Unhealthy 1 of 209 days19951996: Good 159 of 210 days1996: Moderate 33 of 210 days1996: Unhealthy for Sensitive Groups 12 of 210 days1996: Unhealthy 5 of 210 days1996: Very Unhealthy 1 of 210 days1997: Good 158 of 211 days1997: Moderate 40 of 211 days1997: Unhealthy for Sensitive Groups 10 of 211 days1997: Unhealthy 3 of 211 days1998: Good 125 of 207 days1998: Moderate 50 of 207 days1998: Unhealthy for Sensitive Groups 27 of 207 days1998: Unhealthy 4 of 207 days1998: Very Unhealthy 1 of 207 days1999: Good 128 of 232 days1999: Moderate 76 of 232 days1999: Unhealthy for Sensitive Groups 16 of 232 days1999: Unhealthy 11 of 232 days1999: Very Unhealthy 1 of 232 days2000: Good 146 of 244 days2000: Moderate 89 of 244 days2000: Unhealthy for Sensitive Groups 7 of 244 days2000: Unhealthy 2 of 244 days20002001: Good 125 of 237 days2001: Moderate 85 of 237 days2001: Unhealthy for Sensitive Groups 17 of 237 days2001: Unhealthy 10 of 237 days2002: Good 127 of 237 days2002: Moderate 84 of 237 days2002: Unhealthy for Sensitive Groups 18 of 237 days2002: Unhealthy 8 of 237 days2003: Good 138 of 250 days2003: Moderate 92 of 250 days2003: Unhealthy for Sensitive Groups 15 of 250 days2003: Unhealthy 5 of 250 days2004: Good 267 of 349 days2004: Moderate 75 of 349 days2004: Unhealthy for Sensitive Groups 6 of 349 days2004: Unhealthy 1 of 349 days2005: Good 128 of 237 days2005: Moderate 84 of 237 days2005: Unhealthy for Sensitive Groups 25 of 237 days20052006: Good 141 of 243 days2006: Moderate 97 of 243 days2006: Unhealthy for Sensitive Groups 5 of 243 days2007: Good 136 of 240 days2007: Moderate 89 of 240 days2007: Unhealthy for Sensitive Groups 13 of 240 days2007: Unhealthy 2 of 240 days2008: Good 151 of 242 days2008: Moderate 89 of 242 days2008: Unhealthy for Sensitive Groups 2 of 242 days2009: Good 170 of 241 days2009: Moderate 69 of 241 days2009: Unhealthy for Sensitive Groups 2 of 241 days2010: Good 155 of 242 days2010: Moderate 84 of 242 days2010: Unhealthy for Sensitive Groups 3 of 242 days20102011: Good 165 of 242 days2011: Moderate 69 of 242 days2011: Unhealthy for Sensitive Groups 8 of 242 days2012: Good 155 of 242 days2012: Moderate 66 of 242 days2012: Unhealthy for Sensitive Groups 18 of 242 days2012: Unhealthy 3 of 242 days2013: Good 170 of 238 days2013: Moderate 67 of 238 days2013: Unhealthy for Sensitive Groups 1 of 238 days2014: Good 182 of 341 days2014: Moderate 156 of 341 days2014: Unhealthy for Sensitive Groups 3 of 341 days2015: Good 203 of 357 days2015: Moderate 151 of 357 days2015: Unhealthy for Sensitive Groups 3 of 357 days20152016: Good 245 of 364 days2016: Moderate 110 of 364 days2016: Unhealthy for Sensitive Groups 9 of 364 days2017: Good 247 of 365 days2017: Moderate 118 of 365 days2018: Good 255 of 362 days2018: Moderate 104 of 362 days2018: Unhealthy for Sensitive Groups 3 of 362 days2019: Good 225 of 340 days2019: Moderate 115 of 340 days2020: Good 288 of 366 days2020: Moderate 77 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days20202021: Good 247 of 365 days2021: Moderate 115 of 365 days2021: Unhealthy for Sensitive Groups 3 of 365 days2022: Good 237 of 364 days2022: Moderate 125 of 364 days2022: Unhealthy for Sensitive Groups 2 of 364 days2023: Good 238 of 364 days2023: Moderate 115 of 364 days2023: Unhealthy for Sensitive Groups 8 of 364 days2023: Unhealthy 3 of 364 days2024: Good 252 of 347 days2024: Moderate 94 of 347 days2024: Unhealthy for Sensitive Groups 1 of 347 days2025: Good 252 of 303 days2025: Moderate 48 of 303 days2025: Unhealthy for Sensitive Groups 3 of 303 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 711981: 90th percentile AQI 711982: 90th percentile AQI 1011983: 90th percentile AQI 1001984: 90th percentile AQI 931985: 90th percentile AQI 671986: 90th percentile AQI 711987: 90th percentile AQI 901988: 90th percentile AQI 1431989: 90th percentile AQI 871990: 90th percentile AQI 901991: 90th percentile AQI 1121992: 90th percentile AQI 711993: 90th percentile AQI 771994: 90th percentile AQI 841995: 90th percentile AQI 871996: 90th percentile AQI 931997: 90th percentile AQI 801998: 90th percentile AQI 1121999: 90th percentile AQI 1082000: 90th percentile AQI 802001: 90th percentile AQI 1122002: 90th percentile AQI 1012003: 90th percentile AQI 952004: 90th percentile AQI 742005: 90th percentile AQI 1022006: 90th percentile AQI 772007: 90th percentile AQI 902008: 90th percentile AQI 742009: 90th percentile AQI 672010: 90th percentile AQI 742011: 90th percentile AQI 712012: 90th percentile AQI 902013: 90th percentile AQI 642014: 90th percentile AQI 642015: 90th percentile AQI 662016: 90th percentile AQI 632017: 90th percentile AQI 612018: 90th percentile AQI 642019: 90th percentile AQI 602020: 90th percentile AQI 572021: 90th percentile AQI 612022: 90th percentile AQI 622023: 90th percentile AQI 742024: 90th percentile AQI 612025: 90th percentile AQI 571980: Median AQI 271981: Median AQI 291982: Median AQI 351983: Median AQI 371984: Median AQI 391985: Median AQI 371986: Median AQI 351987: Median AQI 381988: Median AQI 421989: Median AQI 411990: Median AQI 401991: Median AQI 391992: Median AQI 341993: Median AQI 391994: Median AQI 381995: Median AQI 361996: Median AQI 411997: Median AQI 391998: Median AQI 461999: Median AQI 472000: Median AQI 442001: Median AQI 492002: Median AQI 472003: Median AQI 482004: Median AQI 352005: Median AQI 482006: Median AQI 462007: Median AQI 482008: Median AQI 452009: Median AQI 432010: Median AQI 452011: Median AQI 432012: Median AQI 452013: Median AQI 432014: Median AQI 482015: Median AQI 482016: Median AQI 422017: Median AQI 422018: Median AQI 432019: Median AQI 422020: Median AQI 392021: Median AQI 412022: Median AQI 442023: Median AQI 442024: Median AQI 422025: 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
Ozone22073%
Fine particles (PM2.5)8327%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253032524830003857126Ozone
20243472529410004261119PM2.5
202336423811583004474178PM2.5
202236423712520004462112PM2.5
202136524711530004161119PM2.5
20203662887710003957126Ozone
20193402251150000426075PM2.5
201836225510430004364122PM2.5
20173652471180000426193PM2.5
201636424511090004263129PM2.5
201535720315130004866131PM2.5
201434118215630004864105PM2.5
20132381706710004364105Ozone
201224215566183004590172Ozone
20112421656980004371150Ozone
20102421558430004574115Ozone
20092411706920004367108Ozone
20082421518920004574133Ozone
200724013689132004890161Ozone
20062431419750004677143Ozone
2005237128842500048102150Ozone
20043492677561003574151Ozone
200325013892155004895192Ozone
2002237127841880047101179Ozone
20012371258517100049112195Ozone
20002441468972004480166Ozone
19992321287616111047108210Ozone
1998207125502741046112207Ozone
199721115840103003980174Ozone
199621015933125104193204Ozone
199520916531121003687159Ozone
199421016235112003884166Ozone
19932131743512103977206Ozone
19922131802571003471151Ozone
1991237167392470039112192Ozone
199023817940172004090182Ozone
198923616260122004187200Ozone
19882281553916153042143224Ozone
198722616446123103890202Ozone
19862372012592003571174Ozone
19852231783870003767133Ozone
198421316530180003993147Ozone
1983265206361391037100201Ozone
1982289223372081035101209Ozone
198136331233144002971164Ozone
198033428629145002771161Ozone

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 Michigan with a similar median AQI in 2025

All monitored counties in Michigan

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