EnviroNearby

Ingham County, Michigan air quality history

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

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 Ingham, Michigan on 365 days. 265 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 Michigan (median 39 across 26 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 194 days. Across the years with fuller monitoring, the share of Good days fell: an average of 76% 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 197 of 324 days1980: Moderate 119 of 324 days1980: Unhealthy for Sensitive Groups 7 of 324 days1980: Unhealthy 1 of 324 days19801981: Good 282 of 349 days1981: Moderate 50 of 349 days1981: Unhealthy for Sensitive Groups 17 of 349 days1982: Good 243 of 278 days1982: Moderate 24 of 278 days1982: Unhealthy for Sensitive Groups 9 of 278 days1982: Unhealthy 2 of 278 days1983: Good 134 of 188 days1983: Moderate 36 of 188 days1983: Unhealthy for Sensitive Groups 13 of 188 days1983: Unhealthy 5 of 188 days1984: Good 135 of 167 days1984: Moderate 23 of 167 days1984: Unhealthy for Sensitive Groups 7 of 167 days1984: Unhealthy 2 of 167 days1985: Good 220 of 244 days1985: Moderate 23 of 244 days1985: Unhealthy 1 of 244 days19851986: Good 237 of 277 days1986: Moderate 33 of 277 days1986: Unhealthy for Sensitive Groups 6 of 277 days1986: Unhealthy 1 of 277 days1987: Good 209 of 259 days1987: Moderate 42 of 259 days1987: Unhealthy for Sensitive Groups 7 of 259 days1987: Very Unhealthy 1 of 259 days1988: Good 165 of 233 days1988: Moderate 36 of 233 days1988: Unhealthy for Sensitive Groups 22 of 233 days1988: Unhealthy 9 of 233 days1988: Very Unhealthy 1 of 233 days1989: Good 162 of 218 days1989: Moderate 41 of 218 days1989: Unhealthy for Sensitive Groups 14 of 218 days1989: Unhealthy 1 of 218 days1990: Good 162 of 209 days1990: Moderate 38 of 209 days1990: Unhealthy for Sensitive Groups 8 of 209 days1990: Unhealthy 1 of 209 days19901991: Good 150 of 214 days1991: Moderate 41 of 214 days1991: Unhealthy for Sensitive Groups 20 of 214 days1991: Unhealthy 3 of 214 days1992: Good 151 of 183 days1992: Moderate 23 of 183 days1992: Unhealthy for Sensitive Groups 8 of 183 days1992: Unhealthy 1 of 183 days1993: Good 154 of 183 days1993: Moderate 22 of 183 days1993: Unhealthy for Sensitive Groups 6 of 183 days1993: Unhealthy 1 of 183 days1994: Good 139 of 182 days1994: Moderate 37 of 182 days1994: Unhealthy for Sensitive Groups 5 of 182 days1994: Unhealthy 1 of 182 days1995: Good 132 of 180 days1995: Moderate 32 of 180 days1995: Unhealthy for Sensitive Groups 12 of 180 days1995: Unhealthy 4 of 180 days19951996: Good 135 of 181 days1996: Moderate 30 of 181 days1996: Unhealthy for Sensitive Groups 13 of 181 days1996: Unhealthy 3 of 181 days1997: Good 143 of 183 days1997: Moderate 30 of 183 days1997: Unhealthy for Sensitive Groups 9 of 183 days1997: Unhealthy 1 of 183 days1998: Good 101 of 183 days1998: Moderate 61 of 183 days1998: Unhealthy for Sensitive Groups 19 of 183 days1998: Unhealthy 2 of 183 days1999: Good 135 of 260 days1999: Moderate 102 of 260 days1999: Unhealthy for Sensitive Groups 17 of 260 days1999: Unhealthy 6 of 260 days2000: Good 149 of 250 days2000: Moderate 91 of 250 days2000: Unhealthy for Sensitive Groups 9 of 250 days2000: Unhealthy 1 of 250 days20002001: Good 212 of 333 days2001: Moderate 106 of 333 days2001: Unhealthy for Sensitive Groups 13 of 333 days2001: Unhealthy 2 of 333 days2002: Good 119 of 241 days2002: Moderate 98 of 241 days2002: Unhealthy for Sensitive Groups 18 of 241 days2002: Unhealthy 6 of 241 days2003: Good 126 of 242 days2003: Moderate 102 of 242 days2003: Unhealthy for Sensitive Groups 11 of 242 days2003: Unhealthy 3 of 242 days2004: Good 164 of 240 days2004: Moderate 73 of 240 days2004: Unhealthy for Sensitive Groups 3 of 240 days2005: Good 115 of 240 days2005: Moderate 99 of 240 days2005: Unhealthy for Sensitive Groups 25 of 240 days2005: Unhealthy 1 of 240 days20052006: Good 133 of 232 days2006: Moderate 94 of 232 days2006: Unhealthy for Sensitive Groups 5 of 232 days2007: Good 126 of 234 days2007: Moderate 95 of 234 days2007: Unhealthy for Sensitive Groups 13 of 234 days2008: Good 151 of 241 days2008: Moderate 87 of 241 days2008: Unhealthy for Sensitive Groups 3 of 241 days2009: Good 170 of 243 days2009: Moderate 72 of 243 days2009: Unhealthy for Sensitive Groups 1 of 243 days2010: Good 234 of 304 days2010: Moderate 69 of 304 days2010: Unhealthy for Sensitive Groups 1 of 304 days20102011: Good 289 of 363 days2011: Moderate 71 of 363 days2011: Unhealthy for Sensitive Groups 3 of 363 days2012: Good 269 of 361 days2012: Moderate 78 of 361 days2012: Unhealthy for Sensitive Groups 14 of 361 days2013: Good 291 of 361 days2013: Moderate 69 of 361 days2013: Unhealthy for Sensitive Groups 1 of 361 days2014: Good 205 of 364 days2014: Moderate 159 of 364 days2015: Good 214 of 364 days2015: Moderate 148 of 364 days2015: Unhealthy for Sensitive Groups 2 of 364 days20152016: Good 226 of 357 days2016: Moderate 125 of 357 days2016: Unhealthy for Sensitive Groups 6 of 357 days2017: Good 257 of 364 days2017: Moderate 107 of 364 days2018: Good 231 of 342 days2018: Moderate 109 of 342 days2018: Unhealthy for Sensitive Groups 2 of 342 days2019: Good 274 of 365 days2019: Moderate 91 of 365 days2020: Good 296 of 366 days2020: Moderate 69 of 366 days2020: Unhealthy 1 of 366 days20202021: Good 204 of 363 days2021: Moderate 159 of 363 days2022: Good 236 of 360 days2022: Moderate 124 of 360 days2023: Good 229 of 363 days2023: Moderate 123 of 363 days2023: Unhealthy for Sensitive Groups 7 of 363 days2023: Unhealthy 4 of 363 days2024: Good 281 of 366 days2024: Moderate 85 of 366 days2025: Good 265 of 365 days2025: Moderate 92 of 365 days2025: Unhealthy for Sensitive Groups 7 of 365 days2025: Unhealthy 1 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 year0501001501980: 90th percentile AQI 811981: 90th percentile AQI 671982: 90th percentile AQI 611983: 90th percentile AQI 971984: 90th percentile AQI 871985: 90th percentile AQI 501986: 90th percentile AQI 641987: 90th percentile AQI 741988: 90th percentile AQI 1261989: 90th percentile AQI 931990: 90th percentile AQI 841991: 90th percentile AQI 1081992: 90th percentile AQI 711993: 90th percentile AQI 671994: 90th percentile AQI 771995: 90th percentile AQI 931996: 90th percentile AQI 971997: 90th percentile AQI 711998: 90th percentile AQI 1011999: 90th percentile AQI 972000: 90th percentile AQI 772001: 90th percentile AQI 852002: 90th percentile AQI 972003: 90th percentile AQI 872004: 90th percentile AQI 732005: 90th percentile AQI 1012006: 90th percentile AQI 742007: 90th percentile AQI 812008: 90th percentile AQI 702009: 90th percentile AQI 652010: 90th percentile AQI 642011: 90th percentile AQI 632012: 90th percentile AQI 792013: 90th percentile AQI 592014: 90th percentile AQI 642015: 90th percentile AQI 632016: 90th percentile AQI 642017: 90th percentile AQI 582018: 90th percentile AQI 612019: 90th percentile AQI 552020: 90th percentile AQI 562021: 90th percentile AQI 682022: 90th percentile AQI 602023: 90th percentile AQI 732024: 90th percentile AQI 572025: 90th percentile AQI 621980: Median AQI 431981: Median AQI 321982: Median AQI 311983: Median AQI 401984: Median AQI 361985: Median AQI 341986: Median AQI 311987: Median AQI 331988: Median AQI 361989: Median AQI 401990: Median AQI 391991: Median AQI 401992: Median AQI 361993: Median AQI 391994: Median AQI 401995: Median AQI 421996: Median AQI 421997: Median AQI 391998: Median AQI 481999: Median AQI 482000: Median AQI 472001: Median AQI 422002: Median AQI 512003: Median AQI 502004: Median AQI 412005: Median AQI 522006: Median AQI 472007: Median AQI 482008: Median AQI 442009: Median AQI 432010: Median AQI 402011: Median AQI 362012: Median AQI 382013: Median AQI 382014: Median AQI 482015: Median AQI 472016: Median AQI 432017: Median AQI 422018: Median AQI 432019: Median AQI 402020: Median AQI 372021: Median AQI 462022: Median AQI 432023: Median AQI 432024: Median AQI 392025: 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
Ozone19453%
Fine particles (PM2.5)16645%
Nitrogen dioxide (NO₂)31%
Coarse particles (PM10)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652659271003862153Ozone
2024366281850000395785Ozone
202336322912374004373194PM2.5
20223602361240000436093PM2.5
20213632041590000466897PM2.5
20203662966901003756151Ozone
2019365274910000405578PM2.5
201834223110920004361147PM2.5
20173642571070000425897PM2.5
201635722612560004364126PM2.5
201536421414820004763107PM2.5
20143642051590000486493PM2.5
20133612916910003859101Ozone
201236126978140003879147Ozone
20113632897130003663119Ozone
20103042346910004064112Ozone
20092431707210004365105Ozone
20082411518730004470115Ozone
200723412695130004881147Ozone
20062321339450004774121Ozone
2005240115992510052101174Ozone
20042401647330004173122Ozone
2003242126102113005087172Ozone
200224111998186005197174Ozone
2001333212106132004285185Ozone
20002501499191004777151Ozone
1999260135102176004897179Ozone
1998183101611920048101174Ozone
19971831433091003971159Ozone
199618113530133004297161Ozone
199518013232124004293182Ozone
19941821393751004077161Ozone
19931831542261003967154Ozone
19921831512381003671190Ozone
1991214150412030040108166Ozone
19902091623881003984174Ozone
198921816241141004093177Ozone
1988233165362291036126201Ozone
19872592094270103374201Ozone
19862772373361003164192Ozone
19852442202301003450154Ozone
19841671352372003687151Ozone
198318813436135004097174Ozone
19822782432492003161156Ozone
198134928250170003267140Ozone
198032419711971004381151NO2

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