EnviroNearby

Oakland County, Michigan air quality history

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

69%
Good days in 2025
41
Median daily AQI, 2025
9
Days above 100 in 2025
350
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Oakland, Michigan on 350 days. 242 of those days (69%) were in the Good range, and the median daily AQI was 41. 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 71% in 1980–1982 versus 68% 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 366 days1980: Moderate 49 of 366 days1980: Unhealthy for Sensitive Groups 17 of 366 days1980: Unhealthy 9 of 366 days1980: Very Unhealthy 5 of 366 days19801981: Good 191 of 365 days1981: Moderate 134 of 365 days1981: Unhealthy for Sensitive Groups 31 of 365 days1981: Unhealthy 9 of 365 days1982: Good 300 of 365 days1982: Moderate 38 of 365 days1982: Unhealthy for Sensitive Groups 16 of 365 days1982: Unhealthy 10 of 365 days1982: Very Unhealthy 1 of 365 days1983: Good 291 of 365 days1983: Moderate 46 of 365 days1983: Unhealthy for Sensitive Groups 14 of 365 days1983: Unhealthy 11 of 365 days1983: Very Unhealthy 3 of 365 days1984: Good 301 of 366 days1984: Moderate 48 of 366 days1984: Unhealthy for Sensitive Groups 13 of 366 days1984: Unhealthy 4 of 366 days1985: Good 301 of 363 days1985: Moderate 52 of 363 days1985: Unhealthy for Sensitive Groups 10 of 363 days19851986: Good 309 of 365 days1986: Moderate 43 of 365 days1986: Unhealthy for Sensitive Groups 9 of 365 days1986: Unhealthy 4 of 365 days1987: Good 311 of 365 days1987: Moderate 39 of 365 days1987: Unhealthy for Sensitive Groups 12 of 365 days1987: Unhealthy 3 of 365 days1988: Good 295 of 365 days1988: Moderate 33 of 365 days1988: Unhealthy for Sensitive Groups 15 of 365 days1988: Unhealthy 16 of 365 days1988: Very Unhealthy 6 of 365 days1989: Good 302 of 362 days1989: Moderate 40 of 362 days1989: Unhealthy for Sensitive Groups 11 of 362 days1989: Unhealthy 8 of 362 days1989: Very Unhealthy 1 of 362 days1990: Good 330 of 365 days1990: Moderate 30 of 365 days1990: Unhealthy for Sensitive Groups 3 of 365 days1990: Unhealthy 2 of 365 days19901991: Good 293 of 364 days1991: Moderate 40 of 364 days1991: Unhealthy for Sensitive Groups 23 of 364 days1991: Unhealthy 8 of 364 days1992: Good 340 of 366 days1992: Moderate 17 of 366 days1992: Unhealthy for Sensitive Groups 8 of 366 days1992: Unhealthy 1 of 366 days1993: Good 325 of 358 days1993: Moderate 25 of 358 days1993: Unhealthy for Sensitive Groups 7 of 358 days1993: Unhealthy 1 of 358 days1994: Good 312 of 361 days1994: Moderate 34 of 361 days1994: Unhealthy for Sensitive Groups 10 of 361 days1994: Unhealthy 5 of 361 days1995: Good 317 of 358 days1995: Moderate 25 of 358 days1995: Unhealthy for Sensitive Groups 14 of 358 days1995: Unhealthy 2 of 358 days19951996: Good 334 of 366 days1996: Moderate 26 of 366 days1996: Unhealthy for Sensitive Groups 6 of 366 days1997: Good 327 of 351 days1997: Moderate 16 of 351 days1997: Unhealthy for Sensitive Groups 7 of 351 days1997: Unhealthy 1 of 351 days1998: Good 247 of 321 days1998: Moderate 52 of 321 days1998: Unhealthy for Sensitive Groups 17 of 321 days1998: Unhealthy 5 of 321 days1999: Good 200 of 299 days1999: Moderate 75 of 299 days1999: Unhealthy for Sensitive Groups 20 of 299 days1999: Unhealthy 4 of 299 days2000: Good 272 of 356 days2000: Moderate 75 of 356 days2000: Unhealthy for Sensitive Groups 9 of 356 days20002001: Good 248 of 364 days2001: Moderate 92 of 364 days2001: Unhealthy for Sensitive Groups 17 of 364 days2001: Unhealthy 7 of 364 days2002: Good 248 of 365 days2002: Moderate 90 of 365 days2002: Unhealthy for Sensitive Groups 17 of 365 days2002: Unhealthy 10 of 365 days2003: Good 262 of 364 days2003: Moderate 84 of 364 days2003: Unhealthy for Sensitive Groups 11 of 364 days2003: Unhealthy 6 of 364 days2003: Very Unhealthy 1 of 364 days2004: Good 283 of 366 days2004: Moderate 77 of 366 days2004: Unhealthy for Sensitive Groups 6 of 366 days2005: Good 239 of 356 days2005: Moderate 95 of 356 days2005: Unhealthy for Sensitive Groups 21 of 356 days2005: Unhealthy 1 of 356 days20052006: Good 279 of 355 days2006: Moderate 70 of 355 days2006: Unhealthy for Sensitive Groups 6 of 355 days2007: Good 185 of 292 days2007: Moderate 88 of 292 days2007: Unhealthy for Sensitive Groups 15 of 292 days2007: Unhealthy 4 of 292 days2008: Good 150 of 243 days2008: Moderate 88 of 243 days2008: Unhealthy for Sensitive Groups 5 of 243 days2009: Good 171 of 244 days2009: Moderate 68 of 244 days2009: Unhealthy for Sensitive Groups 5 of 244 days2010: Good 149 of 240 days2010: Moderate 86 of 240 days2010: Unhealthy for Sensitive Groups 5 of 240 days20102011: Good 153 of 238 days2011: Moderate 69 of 238 days2011: Unhealthy for Sensitive Groups 15 of 238 days2011: Unhealthy 1 of 238 days2012: Good 139 of 240 days2012: Moderate 83 of 240 days2012: Unhealthy for Sensitive Groups 16 of 240 days2012: Unhealthy 2 of 240 days2013: Good 168 of 241 days2013: Moderate 71 of 241 days2013: Unhealthy for Sensitive Groups 2 of 241 days2014: Good 164 of 239 days2014: Moderate 72 of 239 days2014: Unhealthy for Sensitive Groups 3 of 239 days2015: Good 165 of 237 days2015: Moderate 68 of 237 days2015: Unhealthy for Sensitive Groups 4 of 237 days20152016: Good 164 of 244 days2016: Moderate 74 of 244 days2016: Unhealthy for Sensitive Groups 6 of 244 days2017: Good 202 of 276 days2017: Moderate 72 of 276 days2017: Unhealthy for Sensitive Groups 2 of 276 days2018: Good 200 of 278 days2018: Moderate 69 of 278 days2018: Unhealthy for Sensitive Groups 8 of 278 days2018: Unhealthy 1 of 278 days2019: Good 233 of 293 days2019: Moderate 58 of 293 days2019: Unhealthy for Sensitive Groups 2 of 293 days2020: Good 244 of 298 days2020: Moderate 48 of 298 days2020: Unhealthy for Sensitive Groups 6 of 298 days20202021: Good 227 of 296 days2021: Moderate 68 of 296 days2021: Unhealthy for Sensitive Groups 1 of 296 days2022: Good 236 of 282 days2022: Moderate 46 of 282 days2023: Good 193 of 261 days2023: Moderate 58 of 261 days2023: Unhealthy for Sensitive Groups 9 of 261 days2023: Unhealthy 1 of 261 days2024: Good 181 of 301 days2024: Moderate 119 of 301 days2024: Unhealthy for Sensitive Groups 1 of 301 days2025: Good 242 of 350 days2025: Moderate 99 of 350 days2025: Unhealthy for Sensitive Groups 7 of 350 days2025: Unhealthy 2 of 350 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 931981: 90th percentile AQI 1021982: 90th percentile AQI 801983: 90th percentile AQI 901984: 90th percentile AQI 711985: 90th percentile AQI 671986: 90th percentile AQI 671987: 90th percentile AQI 671988: 90th percentile AQI 1011989: 90th percentile AQI 771990: 90th percentile AQI 501991: 90th percentile AQI 901992: 90th percentile AQI 471993: 90th percentile AQI 501994: 90th percentile AQI 641995: 90th percentile AQI 541996: 90th percentile AQI 481997: 90th percentile AQI 471998: 90th percentile AQI 871999: 90th percentile AQI 922000: 90th percentile AQI 702001: 90th percentile AQI 872002: 90th percentile AQI 902003: 90th percentile AQI 802004: 90th percentile AQI 712005: 90th percentile AQI 872006: 90th percentile AQI 642007: 90th percentile AQI 842008: 90th percentile AQI 742009: 90th percentile AQI 742010: 90th percentile AQI 742011: 90th percentile AQI 802012: 90th percentile AQI 972013: 90th percentile AQI 632014: 90th percentile AQI 712015: 90th percentile AQI 672016: 90th percentile AQI 772017: 90th percentile AQI 642018: 90th percentile AQI 682019: 90th percentile AQI 602020: 90th percentile AQI 612021: 90th percentile AQI 642022: 90th percentile AQI 562023: 90th percentile AQI 742024: 90th percentile AQI 702025: 90th percentile AQI 671980: Median AQI 321981: Median AQI 491982: Median AQI 291983: Median AQI 261984: Median AQI 271985: Median AQI 311986: Median AQI 271987: Median AQI 241988: Median AQI 251989: Median AQI 271990: Median AQI 251991: Median AQI 251992: Median AQI 201993: Median AQI 261994: Median AQI 241995: Median AQI 221996: Median AQI 191997: Median AQI 171998: Median AQI 261999: Median AQI 392000: Median AQI 302001: Median AQI 342002: Median AQI 342003: Median AQI 322004: Median AQI 352005: Median AQI 382006: Median AQI 302007: Median AQI 442008: Median AQI 452009: Median AQI 432010: Median AQI 442011: Median AQI 442012: Median AQI 472013: Median AQI 412014: Median AQI 422015: Median AQI 442016: Median AQI 432017: Median AQI 422018: Median AQI 412019: Median AQI 392020: Median AQI 372021: Median AQI 392022: Median AQI 392023: Median AQI 412024: Median AQI 452025: Median AQI 411980198519901995200020052010201520202025
  • 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)18453%
Ozone16647%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253502429972004167166PM2.5
202430118111910004570101Ozone
20232611935891004174169Ozone
20222822364600003956100Ozone
20212962276810003964101Ozone
20202982444860003761126Ozone
20192932335820003960122Ozone
20182782006981004168151Ozone
20172762027220004264147Ozone
20162441647460004377126Ozone
20152371656840004467142Ozone
20142391647230004271112Ozone
20132411687120004163119Ozone
201224013983162004797192Ozone
201123815369151004480154Ozone
20102401498650004474140Ozone
20092441716850004374122Ozone
20082431508850004574122Ozone
200729218588154004484159Ozone
20063552797060003064136Ozone
200535623995211003887151Ozone
20043662837760003571129Ozone
200336426284116103280201Ozone
2002365248901710003490190Ozone
200136424892177003487172CO
20003562727590003070140Ozone
199929920075204003992169Ozone
199832124752175002687185Ozone
19973513271671001747154CO
19963663342660001948136CO
199535831725142002254177Ozone
199436131234105002464187CO
19933583252571002650169CO
19923663401781002047161CO
199136429340238002590185Ozone
19903653303032002550166Ozone
198936230240118102777201Ozone
19883652953315166025101240CO
198736531139123002467190CO
19863653094394002767161Ozone
198536330152100003167150Ozone
198436630148134002771185Ozone
1983365291461411302690214CO
1982365300381610102980201Ozone
19813651911343190049102185NO2
198036628649179503293223Ozone

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