EnviroNearby

Missaukee County, Michigan air quality history

Daily Air Quality Index summaries from EPA monitors in Missaukee, Michigan, 1998–2025.

87%
Good days in 2025
35
Median daily AQI, 2025
4
Days above 100 in 2025
360
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Missaukee, Michigan on 360 days. 313 of those days (87%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Michigan (median 39 across 26 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 253 days. Across the years with fuller monitoring, the share of Good days rose: an average of 75% in 1998–2000 versus 78% 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%1998: Good 124 of 181 days1998: Moderate 42 of 181 days1998: Unhealthy for Sensitive Groups 14 of 181 days1998: Unhealthy 1 of 181 days19981999: Good 118 of 183 days1999: Moderate 41 of 183 days1999: Unhealthy for Sensitive Groups 18 of 183 days1999: Unhealthy 6 of 183 days2000: Good 327 of 353 days2000: Moderate 21 of 353 days2000: Unhealthy for Sensitive Groups 4 of 353 days2000: Unhealthy 1 of 353 days20002001: Good 129 of 182 days2001: Moderate 37 of 182 days2001: Unhealthy for Sensitive Groups 14 of 182 days2001: Unhealthy 2 of 182 days2002: Good 263 of 344 days2002: Moderate 72 of 344 days2002: Unhealthy for Sensitive Groups 9 of 344 days20022003: Good 279 of 352 days2003: Moderate 62 of 352 days2003: Unhealthy for Sensitive Groups 10 of 352 days2003: Unhealthy 1 of 352 days2004: Good 181 of 240 days2004: Moderate 55 of 240 days2004: Unhealthy for Sensitive Groups 4 of 240 days20042005: Good 154 of 241 days2005: Moderate 80 of 241 days2005: Unhealthy for Sensitive Groups 6 of 241 days2005: Unhealthy 1 of 241 days2006: Good 171 of 237 days2006: Moderate 58 of 237 days2006: Unhealthy for Sensitive Groups 8 of 237 days20062007: Good 169 of 239 days2007: Moderate 59 of 239 days2007: Unhealthy for Sensitive Groups 11 of 239 days2008: Good 181 of 241 days2008: Moderate 57 of 241 days2008: Unhealthy for Sensitive Groups 3 of 241 days20082009: Good 198 of 240 days2009: Moderate 42 of 240 days2010: Good 252 of 298 days2010: Moderate 46 of 298 days20102011: Good 317 of 360 days2011: Moderate 41 of 360 days2011: Unhealthy for Sensitive Groups 2 of 360 days2012: Good 284 of 363 days2012: Moderate 62 of 363 days2012: Unhealthy for Sensitive Groups 17 of 363 days20122013: Good 306 of 363 days2013: Moderate 56 of 363 days2013: Unhealthy for Sensitive Groups 1 of 363 days2014: Good 278 of 365 days2014: Moderate 87 of 365 days20142015: Good 272 of 361 days2015: Moderate 88 of 361 days2015: Unhealthy for Sensitive Groups 1 of 361 days2016: Good 302 of 365 days2016: Moderate 57 of 365 days2016: Unhealthy for Sensitive Groups 6 of 365 days20162017: Good 310 of 364 days2017: Moderate 53 of 364 days2017: Unhealthy for Sensitive Groups 1 of 364 days2018: Good 316 of 365 days2018: Moderate 49 of 365 days20182019: Good 306 of 363 days2019: Moderate 57 of 363 days2020: Good 248 of 365 days2020: Moderate 116 of 365 days2020: Unhealthy for Sensitive Groups 1 of 365 days20202021: Good 216 of 355 days2021: Moderate 139 of 355 days2022: Good 228 of 363 days2022: Moderate 134 of 363 days2022: Unhealthy for Sensitive Groups 1 of 363 days20222023: Good 203 of 362 days2023: Moderate 153 of 362 days2023: Unhealthy for Sensitive Groups 4 of 362 days2023: Unhealthy 1 of 362 days2023: Very Unhealthy 1 of 362 days2024: Good 337 of 365 days2024: Moderate 28 of 365 days20242025: Good 313 of 360 days2025: Moderate 43 of 360 days2025: Unhealthy for Sensitive Groups 4 of 360 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 year0501001501998: 90th percentile AQI 931999: 90th percentile AQI 1122000: 90th percentile AQI 462001: 90th percentile AQI 932002: 90th percentile AQI 672003: 90th percentile AQI 642004: 90th percentile AQI 712005: 90th percentile AQI 802006: 90th percentile AQI 662007: 90th percentile AQI 742008: 90th percentile AQI 642009: 90th percentile AQI 582010: 90th percentile AQI 582011: 90th percentile AQI 552012: 90th percentile AQI 672013: 90th percentile AQI 552014: 90th percentile AQI 582015: 90th percentile AQI 582016: 90th percentile AQI 552017: 90th percentile AQI 522018: 90th percentile AQI 542019: 90th percentile AQI 542020: 90th percentile AQI 572021: 90th percentile AQI 622022: 90th percentile AQI 582023: 90th percentile AQI 722024: 90th percentile AQI 492025: 90th percentile AQI 581998: Median AQI 441999: Median AQI 452000: Median AQI 212001: Median AQI 432002: Median AQI 342003: Median AQI 332004: Median AQI 392005: Median AQI 432006: Median AQI 422007: Median AQI 412008: Median AQI 412009: Median AQI 382010: Median AQI 352011: Median AQI 362012: Median AQI 382013: Median AQI 382014: Median AQI 412015: Median AQI 402016: Median AQI 382017: Median AQI 372018: Median AQI 372019: Median AQI 362020: Median AQI 412021: Median AQI 452022: Median AQI 462023: Median AQI 482024: Median AQI 352025: Median AQI 35199820002002200420062008201020122014201620182020202220242025
  • 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
Ozone25370%
Fine particles (PM2.5)10529%
Nitrogen dioxide (NO₂)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253603134340003558133Ozone
2024365337280000354984Ozone
202336220315341104872201PM2.5
202236322813410004658108PM2.5
20213552161390000456290PM2.5
202036524811610004157105PM2.5
2019363306570000365474Ozone
2018365316490000375497Ozone
20173643105310003752101Ozone
20163653025760003855115Ozone
20153612728810004058101Ozone
2014365278870000415897Ozone
20133633065610003855101Ozone
201236328462170003867147Ozone
20113603174120003655122Ozone
2010298252460000355897Ozone
2009240198420000385897Ozone
20082411815730004164136Ozone
200723916959110004174143Ozone
20062371715880004266150Ozone
20052411548061004380151Ozone
20042401815540003971147Ozone
200335227962101003364174Ozone
20023442637290003467147Ozone
200118212937142004393169Ozone
20003533272141002146182Ozone
1999183118411860045112182Ozone
199818112442141004493174Ozone

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 1998–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem