EnviroNearby

Clinton County, Michigan air quality history

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

90%
Good days in 2025
39
Median daily AQI, 2025
1
Days above 100 in 2025
204
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Clinton, Michigan on 204 days. 184 of those days (90%) were in the Good range, and the median daily AQI was 39. 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 204 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 88% in 1980–1982 versus 90% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (204 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

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 232 of 298 days1980: Moderate 36 of 298 days1980: Unhealthy for Sensitive Groups 23 of 298 days1980: Unhealthy 7 of 298 days19801981: Good 235 of 271 days1981: Moderate 27 of 271 days1981: Unhealthy for Sensitive Groups 9 of 271 days1982: Good 173 of 175 days1982: Moderate 2 of 175 days1983: Good 179 of 192 days1983: Moderate 13 of 192 days1984: Good 192 of 195 days1984: Moderate 3 of 195 days1985: Good 189 of 201 days1985: Moderate 11 of 201 days1985: Unhealthy for Sensitive Groups 1 of 201 days19851986: Good 156 of 207 days1986: Moderate 38 of 207 days1986: Unhealthy for Sensitive Groups 11 of 207 days1986: Unhealthy 2 of 207 days1987: Good 130 of 209 days1987: Moderate 57 of 209 days1987: Unhealthy for Sensitive Groups 18 of 209 days1987: Unhealthy 4 of 209 days1988: Good 138 of 213 days1988: Moderate 38 of 213 days1988: Unhealthy for Sensitive Groups 20 of 213 days1988: Unhealthy 14 of 213 days1988: Very Unhealthy 3 of 213 days1989: Good 146 of 210 days1989: Moderate 48 of 210 days1989: Unhealthy for Sensitive Groups 14 of 210 days1989: Unhealthy 2 of 210 days1990: Good 158 of 214 days1990: Moderate 39 of 214 days1990: Unhealthy for Sensitive Groups 16 of 214 days1990: Unhealthy 1 of 214 days19901991: Good 143 of 213 days1991: Moderate 42 of 213 days1991: Unhealthy for Sensitive Groups 26 of 213 days1991: Unhealthy 2 of 213 days1992: Good 141 of 182 days1992: Moderate 29 of 182 days1992: Unhealthy for Sensitive Groups 9 of 182 days1992: Unhealthy 3 of 182 days1993: Good 148 of 181 days1993: Moderate 25 of 181 days1993: Unhealthy for Sensitive Groups 5 of 181 days1993: Unhealthy 3 of 181 days1994: Good 131 of 179 days1994: Moderate 38 of 179 days1994: Unhealthy for Sensitive Groups 9 of 179 days1994: Unhealthy 1 of 179 days1995: Good 151 of 183 days1995: Moderate 24 of 183 days1995: Unhealthy for Sensitive Groups 8 of 183 days19951996: Good 156 of 183 days1996: Moderate 25 of 183 days1996: Unhealthy for Sensitive Groups 2 of 183 days1997: Good 132 of 176 days1997: Moderate 36 of 176 days1997: Unhealthy for Sensitive Groups 8 of 176 days1998: Good 118 of 181 days1998: Moderate 47 of 181 days1998: Unhealthy for Sensitive Groups 15 of 181 days1998: Unhealthy 1 of 181 days1999: Good 132 of 182 days1999: Moderate 30 of 182 days1999: Unhealthy for Sensitive Groups 15 of 182 days1999: Unhealthy 5 of 182 days2000: Good 155 of 182 days2000: Moderate 22 of 182 days2000: Unhealthy for Sensitive Groups 5 of 182 days20002001: Good 125 of 183 days2001: Moderate 41 of 183 days2001: Unhealthy for Sensitive Groups 13 of 183 days2001: Unhealthy 4 of 183 days2002: Good 124 of 182 days2002: Moderate 42 of 182 days2002: Unhealthy for Sensitive Groups 14 of 182 days2002: Unhealthy 2 of 182 days2003: Good 123 of 183 days2003: Moderate 48 of 183 days2003: Unhealthy for Sensitive Groups 8 of 183 days2003: Unhealthy 4 of 183 days2004: Good 151 of 183 days2004: Moderate 29 of 183 days2004: Unhealthy for Sensitive Groups 3 of 183 days2005: Good 118 of 183 days2005: Moderate 47 of 183 days2005: Unhealthy for Sensitive Groups 18 of 183 days20052006: Good 146 of 181 days2006: Moderate 31 of 181 days2006: Unhealthy for Sensitive Groups 4 of 181 days2007: Good 137 of 181 days2007: Moderate 36 of 181 days2007: Unhealthy for Sensitive Groups 8 of 181 days2008: Good 136 of 178 days2008: Moderate 40 of 178 days2008: Unhealthy for Sensitive Groups 2 of 178 days2009: Good 149 of 173 days2009: Moderate 24 of 173 days2010: Good 147 of 183 days2010: Moderate 35 of 183 days2010: Unhealthy for Sensitive Groups 1 of 183 days20102011: Good 152 of 183 days2011: Moderate 28 of 183 days2011: Unhealthy for Sensitive Groups 3 of 183 days2012: Good 118 of 176 days2012: Moderate 46 of 176 days2012: Unhealthy for Sensitive Groups 10 of 176 days2012: Unhealthy 2 of 176 days2013: Good 148 of 183 days2013: Moderate 34 of 183 days2013: Unhealthy for Sensitive Groups 1 of 183 days2014: Good 148 of 182 days2014: Moderate 33 of 182 days2014: Unhealthy for Sensitive Groups 1 of 182 days2015: Good 161 of 182 days2015: Moderate 21 of 182 days20152016: Good 143 of 181 days2016: Moderate 31 of 181 days2016: Unhealthy for Sensitive Groups 7 of 181 days2017: Good 211 of 238 days2017: Moderate 27 of 238 days2018: Good 213 of 244 days2018: Moderate 27 of 244 days2018: Unhealthy for Sensitive Groups 4 of 244 days2019: Good 243 of 248 days2019: Moderate 5 of 248 days2020: Good 244 of 256 days2020: Moderate 12 of 256 days20202021: Good 217 of 239 days2021: Moderate 22 of 239 days2022: Good 213 of 235 days2022: Moderate 22 of 235 days2023: Good 206 of 240 days2023: Moderate 31 of 240 days2023: Unhealthy for Sensitive Groups 3 of 240 days2024: Good 228 of 244 days2024: Moderate 16 of 244 days2025: Good 184 of 204 days2025: Moderate 19 of 204 days2025: Unhealthy for Sensitive Groups 1 of 204 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 1011981: 90th percentile AQI 611982: 90th percentile AQI 371983: 90th percentile AQI 441984: 90th percentile AQI 391985: 90th percentile AQI 481986: 90th percentile AQI 901987: 90th percentile AQI 1011988: 90th percentile AQI 1291989: 90th percentile AQI 931990: 90th percentile AQI 901991: 90th percentile AQI 1121992: 90th percentile AQI 871993: 90th percentile AQI 741994: 90th percentile AQI 741995: 90th percentile AQI 741996: 90th percentile AQI 671997: 90th percentile AQI 841998: 90th percentile AQI 971999: 90th percentile AQI 1052000: 90th percentile AQI 582001: 90th percentile AQI 1002002: 90th percentile AQI 972003: 90th percentile AQI 902004: 90th percentile AQI 612005: 90th percentile AQI 1002006: 90th percentile AQI 642007: 90th percentile AQI 842008: 90th percentile AQI 712009: 90th percentile AQI 542010: 90th percentile AQI 612011: 90th percentile AQI 672012: 90th percentile AQI 932013: 90th percentile AQI 612014: 90th percentile AQI 642015: 90th percentile AQI 542016: 90th percentile AQI 712017: 90th percentile AQI 542018: 90th percentile AQI 642019: 90th percentile AQI 462020: 90th percentile AQI 462021: 90th percentile AQI 502022: 90th percentile AQI 492023: 90th percentile AQI 612024: 90th percentile AQI 492025: 90th percentile AQI 501980: Median AQI 371981: Median AQI 311982: Median AQI 181983: Median AQI 251984: Median AQI 201985: Median AQI 321986: Median AQI 381987: Median AQI 441988: Median AQI 411989: Median AQI 441990: Median AQI 421991: Median AQI 421992: Median AQI 401993: Median AQI 401994: Median AQI 431995: Median AQI 401996: Median AQI 381997: Median AQI 391998: Median AQI 441999: Median AQI 422000: Median AQI 392001: Median AQI 432002: Median AQI 422003: Median AQI 452004: Median AQI 402005: Median AQI 442006: Median AQI 412007: Median AQI 422008: Median AQI 422009: Median AQI 382010: Median AQI 422011: Median AQI 392012: Median AQI 442013: Median AQI 412014: Median AQI 412015: Median AQI 392016: Median AQI 412017: Median AQI 382018: Median AQI 392019: Median AQI 352020: Median AQI 342021: Median AQI 372022: Median AQI 382023: Median AQI 382024: Median AQI 382025: Median AQI 391980198519901995200020052010201520202025
  • 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
Ozone204100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20252041841910003950119Ozone
2024244228160000384980Ozone
20232402063130003861136Ozone
2022235213220000384990Ozone
20212392172200003750100Ozone
2020256244120000344693Ozone
201924824350000354667Ozone
20182442132740003964143Ozone
2017238211270000385493Ozone
20161811433170004171122Ozone
20151821612100003954100Ozone
20141821483310004164112Ozone
20131831483410004161108Ozone
201217611846102004493166Ozone
20111831522830003967122Ozone
20101831473510004261115Ozone
20091731492400003854100Ozone
20081781364020004271126Ozone
20071811373680004284150Ozone
20061811463140004164126Ozone
2005183118471800044100143Ozone
20041831512930004061129Ozone
20031831234884004590177Ozone
200218212442142004297169Ozone
2001183125411340043100177Ozone
20001821552250003958147Ozone
1999182132301550042105172Ozone
199818111847151004497172Ozone
19971761323680003984136Ozone
19961831562520003867108Ozone
19951831512480004074133Ozone
19941791313891004374166Ozone
19931811482553004074164Ozone
19921821412993004087200Ozone
1991213143422620042112185Ozone
199021415839161004290166Ozone
198921014648142004493185Ozone
19882131383820143041129206Ozone
1987209130571840044101190Ozone
198620715638112003890195Ozone
19852011891110003248105Ozone
198419519230000203964Ozone
1983192179130000254493Ozone
198217517320000183771Ozone
19812712352790003161133Ozone
1980298232362370037101200Ozone

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