EnviroNearby

Macomb County, Michigan air quality history

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

70%
Good days in 2025
40
Median daily AQI, 2025
10
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 Macomb, Michigan on 365 days. 256 of those days (70%) were in the Good range, and the median daily AQI was 40. 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 fine particles (PM2.5) on 184 days. Across the years with fuller monitoring, the share of Good days fell: an average of 79% in 1980–1982 versus 64% 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 298 of 366 days1980: Moderate 43 of 366 days1980: Unhealthy for Sensitive Groups 16 of 366 days1980: Unhealthy 7 of 366 days1980: Very Unhealthy 2 of 366 days19801981: Good 290 of 365 days1981: Moderate 43 of 365 days1981: Unhealthy for Sensitive Groups 19 of 365 days1981: Unhealthy 11 of 365 days1981: Very Unhealthy 2 of 365 days1982: Good 266 of 353 days1982: Moderate 60 of 353 days1982: Unhealthy for Sensitive Groups 18 of 353 days1982: Unhealthy 7 of 353 days1982: Very Unhealthy 2 of 353 days1983: Good 289 of 364 days1983: Moderate 46 of 364 days1983: Unhealthy for Sensitive Groups 14 of 364 days1983: Unhealthy 14 of 364 days1983: Very Unhealthy 1 of 364 days1984: Good 295 of 361 days1984: Moderate 46 of 361 days1984: Unhealthy for Sensitive Groups 18 of 361 days1984: Unhealthy 2 of 361 days1985: Good 309 of 362 days1985: Moderate 38 of 362 days1985: Unhealthy for Sensitive Groups 13 of 362 days1985: Unhealthy 2 of 362 days19851986: Good 280 of 337 days1986: Moderate 46 of 337 days1986: Unhealthy for Sensitive Groups 7 of 337 days1986: Unhealthy 4 of 337 days1987: Good 287 of 365 days1987: Moderate 54 of 365 days1987: Unhealthy for Sensitive Groups 17 of 365 days1987: Unhealthy 7 of 365 days1988: Good 271 of 344 days1988: Moderate 35 of 344 days1988: Unhealthy for Sensitive Groups 15 of 344 days1988: Unhealthy 16 of 344 days1988: Very Unhealthy 7 of 344 days1989: Good 286 of 358 days1989: Moderate 42 of 358 days1989: Unhealthy for Sensitive Groups 18 of 358 days1989: Unhealthy 11 of 358 days1989: Very Unhealthy 1 of 358 days1990: Good 297 of 365 days1990: Moderate 43 of 365 days1990: Unhealthy for Sensitive Groups 17 of 365 days1990: Unhealthy 7 of 365 days1990: Very Unhealthy 1 of 365 days19901991: Good 281 of 365 days1991: Moderate 45 of 365 days1991: Unhealthy for Sensitive Groups 24 of 365 days1991: Unhealthy 14 of 365 days1991: Very Unhealthy 1 of 365 days1992: Good 327 of 366 days1992: Moderate 25 of 366 days1992: Unhealthy for Sensitive Groups 12 of 366 days1992: Unhealthy 2 of 366 days1993: Good 319 of 365 days1993: Moderate 29 of 365 days1993: Unhealthy for Sensitive Groups 13 of 365 days1993: Unhealthy 4 of 365 days1994: Good 299 of 365 days1994: Moderate 37 of 365 days1994: Unhealthy for Sensitive Groups 22 of 365 days1994: Unhealthy 5 of 365 days1994: Very Unhealthy 2 of 365 days1995: Good 290 of 353 days1995: Moderate 43 of 353 days1995: Unhealthy for Sensitive Groups 11 of 353 days1995: Unhealthy 7 of 353 days1995: Very Unhealthy 2 of 353 days19951996: Good 307 of 366 days1996: Moderate 33 of 366 days1996: Unhealthy for Sensitive Groups 17 of 366 days1996: Unhealthy 9 of 366 days1997: Good 308 of 365 days1997: Moderate 41 of 365 days1997: Unhealthy for Sensitive Groups 9 of 365 days1997: Unhealthy 5 of 365 days1997: Very Unhealthy 2 of 365 days1998: Good 266 of 351 days1998: Moderate 49 of 351 days1998: Unhealthy for Sensitive Groups 26 of 351 days1998: Unhealthy 9 of 351 days1998: Very Unhealthy 1 of 351 days1999: Good 249 of 365 days1999: Moderate 84 of 365 days1999: Unhealthy for Sensitive Groups 21 of 365 days1999: Unhealthy 10 of 365 days1999: Very Unhealthy 1 of 365 days2000: Good 255 of 353 days2000: Moderate 88 of 353 days2000: Unhealthy for Sensitive Groups 9 of 353 days2000: Unhealthy 1 of 353 days20002001: Good 247 of 364 days2001: Moderate 91 of 364 days2001: Unhealthy for Sensitive Groups 13 of 364 days2001: Unhealthy 13 of 364 days2002: Good 244 of 365 days2002: Moderate 90 of 365 days2002: Unhealthy for Sensitive Groups 14 of 365 days2002: Unhealthy 17 of 365 days2003: Good 252 of 364 days2003: Moderate 95 of 364 days2003: Unhealthy for Sensitive Groups 12 of 364 days2003: Unhealthy 2 of 364 days2003: Very Unhealthy 3 of 364 days2004: Good 276 of 366 days2004: Moderate 80 of 366 days2004: Unhealthy for Sensitive Groups 10 of 366 days2005: Good 233 of 359 days2005: Moderate 91 of 359 days2005: Unhealthy for Sensitive Groups 26 of 359 days2005: Unhealthy 9 of 359 days20052006: Good 278 of 365 days2006: Moderate 74 of 365 days2006: Unhealthy for Sensitive Groups 12 of 365 days2006: Unhealthy 1 of 365 days2007: Good 198 of 302 days2007: Moderate 80 of 302 days2007: Unhealthy for Sensitive Groups 16 of 302 days2007: Unhealthy 8 of 302 days2008: Good 143 of 243 days2008: Moderate 88 of 243 days2008: Unhealthy for Sensitive Groups 12 of 243 days2009: Good 166 of 238 days2009: Moderate 66 of 238 days2009: Unhealthy for Sensitive Groups 5 of 238 days2009: Unhealthy 1 of 238 days2010: Good 156 of 244 days2010: Moderate 77 of 244 days2010: Unhealthy for Sensitive Groups 9 of 244 days2010: Unhealthy 2 of 244 days20102011: Good 154 of 242 days2011: Moderate 74 of 242 days2011: Unhealthy for Sensitive Groups 13 of 242 days2011: Unhealthy 1 of 242 days2012: Good 142 of 243 days2012: Moderate 80 of 243 days2012: Unhealthy for Sensitive Groups 19 of 243 days2012: Unhealthy 1 of 243 days2012: Very Unhealthy 1 of 243 days2013: Good 164 of 244 days2013: Moderate 75 of 244 days2013: Unhealthy for Sensitive Groups 5 of 244 days2014: Good 169 of 244 days2014: Moderate 70 of 244 days2014: Unhealthy for Sensitive Groups 5 of 244 days2015: Good 158 of 241 days2015: Moderate 77 of 241 days2015: Unhealthy for Sensitive Groups 5 of 241 days2015: Unhealthy 1 of 241 days20152016: Good 171 of 243 days2016: Moderate 65 of 243 days2016: Unhealthy for Sensitive Groups 7 of 243 days2017: Good 212 of 284 days2017: Moderate 69 of 284 days2017: Unhealthy for Sensitive Groups 3 of 284 days2018: Good 229 of 299 days2018: Moderate 60 of 299 days2018: Unhealthy for Sensitive Groups 10 of 299 days2019: Good 238 of 292 days2019: Moderate 53 of 292 days2019: Unhealthy for Sensitive Groups 1 of 292 days2020: Good 252 of 299 days2020: Moderate 35 of 299 days2020: Unhealthy for Sensitive Groups 12 of 299 days20202021: Good 180 of 365 days2021: Moderate 182 of 365 days2021: Unhealthy for Sensitive Groups 3 of 365 days2022: Good 223 of 365 days2022: Moderate 140 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2023: Good 182 of 364 days2023: Moderate 170 of 364 days2023: Unhealthy for Sensitive Groups 8 of 364 days2023: Unhealthy 4 of 364 days2024: Good 259 of 366 days2024: Moderate 104 of 366 days2024: Unhealthy for Sensitive Groups 3 of 366 days2025: Good 256 of 365 days2025: Moderate 99 of 365 days2025: Unhealthy for Sensitive Groups 8 of 365 days2025: Unhealthy 2 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 841981: 90th percentile AQI 971982: 90th percentile AQI 871983: 90th percentile AQI 931984: 90th percentile AQI 711985: 90th percentile AQI 671986: 90th percentile AQI 711987: 90th percentile AQI 801988: 90th percentile AQI 1081989: 90th percentile AQI 831990: 90th percentile AQI 841991: 90th percentile AQI 1051992: 90th percentile AQI 511993: 90th percentile AQI 641994: 90th percentile AQI 811995: 90th percentile AQI 801996: 90th percentile AQI 801997: 90th percentile AQI 711998: 90th percentile AQI 1011999: 90th percentile AQI 932000: 90th percentile AQI 762001: 90th percentile AQI 912002: 90th percentile AQI 872003: 90th percentile AQI 812004: 90th percentile AQI 732005: 90th percentile AQI 1002006: 90th percentile AQI 712007: 90th percentile AQI 902008: 90th percentile AQI 772009: 90th percentile AQI 742010: 90th percentile AQI 842011: 90th percentile AQI 802012: 90th percentile AQI 1002013: 90th percentile AQI 652014: 90th percentile AQI 742015: 90th percentile AQI 742016: 90th percentile AQI 712017: 90th percentile AQI 642018: 90th percentile AQI 712019: 90th percentile AQI 582020: 90th percentile AQI 632021: 90th percentile AQI 712022: 90th percentile AQI 702023: 90th percentile AQI 752024: 90th percentile AQI 652025: 90th percentile AQI 681980: Median AQI 341981: Median AQI 331982: Median AQI 341983: Median AQI 311984: Median AQI 301985: Median AQI 281986: Median AQI 291987: Median AQI 291988: Median AQI 311989: Median AQI 311990: Median AQI 301991: Median AQI 301992: Median AQI 241993: Median AQI 301994: Median AQI 341995: Median AQI 321996: Median AQI 321997: Median AQI 321998: Median AQI 311999: Median AQI 362000: Median AQI 332001: Median AQI 402002: Median AQI 372003: Median AQI 362004: Median AQI 342005: Median AQI 402006: Median AQI 342007: Median AQI 442008: Median AQI 462009: Median AQI 442010: Median AQI 462011: Median AQI 432012: Median AQI 462013: Median AQI 432014: Median AQI 432015: Median AQI 442016: Median AQI 442017: Median AQI 422018: Median AQI 392019: Median AQI 392020: Median AQI 362021: Median AQI 512022: Median AQI 442023: Median AQI 512024: Median AQI 422025: Median AQI 401980198519901995200020052010201520202025
  • 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)18450%
Ozone18150%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652569982004068166PM2.5
202436625910430004265115PM2.5
202336418217084005175195PM2.5
202236522314020004470126PM2.5
202136518018230005171115PM2.5
202029925235120003663126Ozone
20192922385310003958101Ozone
201829922960100003971143Ozone
20172842126930004264112Ozone
20162431716570004471147Ozone
20152411587751004474170Ozone
20142441697050004374136Ozone
20132441647550004365129Ozone
2012243142801911046100202Ozone
201124215474131004380159Ozone
20102441567792004684159Ozone
20092381666651004474174Ozone
200824314388120004677147Ozone
200730219880168004490187Ozone
200636527874121003471164Ozone
2005359233912690040100195Ozone
200436627680100003473143Ozone
200336425295122303681215Ozone
2002365244901417003787192Ozone
2001364247911313004091200Ozone
20003532558891003376161Ozone
1999365249842110103693201Ozone
1998351266492691031101206Ozone
19973653084195203271205NO2
199636630733179003280179Ozone
199535329043117203280207Ozone
199436529937225203481218Ozone
199336531929134003064192Ozone
199236632725122002451159CO
19913652814524141030105207Ozone
199036529743177103084203Ozone
1989358286421811103183203Ozone
19883442713515167031108237Ozone
198736528754177002980192Ozone
19863372804674002971185Ozone
198536230938132002867166Ozone
198436129546182003071156Ozone
1983364289461414103193218Ozone
198235326660187203487210Ozone
1981365290431911203397213Ozone
198036629843167203484213Ozone

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