EnviroNearby

Berrien County, Michigan air quality history

Daily Air Quality Index summaries from EPA monitors in Berrien, Michigan, 1991–2025.

81%
Good days in 2025
41
Median daily AQI, 2025
3
Days above 100 in 2025
262
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Berrien, Michigan on 262 days. 212 of those days (81%) 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 ozone on 262 days. Across the years with fuller monitoring, the share of Good days rose: an average of 65% in 1993–1995 versus 79% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (262 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.

Years with fewer than 120 monitored days (1991, 1992) are shown in the table but left out of comparisons and trend statements.

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%1991: Good 40 of 113 days1991: Moderate 34 of 113 days1991: Unhealthy for Sensitive Groups 27 of 113 days1991: Unhealthy 11 of 113 days1991: Very Unhealthy 1 of 113 days19911992: Good 47 of 56 days1992: Moderate 6 of 56 days1992: Unhealthy for Sensitive Groups 3 of 56 days1993: Good 128 of 182 days1993: Moderate 42 of 182 days1993: Unhealthy for Sensitive Groups 12 of 182 days1994: Good 118 of 177 days1994: Moderate 46 of 177 days1994: Unhealthy for Sensitive Groups 8 of 177 days1994: Unhealthy 5 of 177 days1995: Good 105 of 183 days1995: Moderate 50 of 183 days1995: Unhealthy for Sensitive Groups 22 of 183 days1995: Unhealthy 4 of 183 days1995: Very Unhealthy 2 of 183 days1996: Good 97 of 183 days1996: Moderate 54 of 183 days1996: Unhealthy for Sensitive Groups 20 of 183 days1996: Unhealthy 9 of 183 days1996: Very Unhealthy 3 of 183 days19961997: Good 95 of 183 days1997: Moderate 56 of 183 days1997: Unhealthy for Sensitive Groups 22 of 183 days1997: Unhealthy 10 of 183 days1998: Good 73 of 177 days1998: Moderate 67 of 177 days1998: Unhealthy for Sensitive Groups 23 of 177 days1998: Unhealthy 13 of 177 days1998: Very Unhealthy 1 of 177 days1999: Good 107 of 219 days1999: Moderate 75 of 219 days1999: Unhealthy for Sensitive Groups 22 of 219 days1999: Unhealthy 14 of 219 days1999: Very Unhealthy 1 of 219 days2000: Good 134 of 243 days2000: Moderate 102 of 243 days2000: Unhealthy for Sensitive Groups 4 of 243 days2000: Unhealthy 3 of 243 days2001: Good 122 of 239 days2001: Moderate 87 of 239 days2001: Unhealthy for Sensitive Groups 22 of 239 days2001: Unhealthy 8 of 239 days20012002: Good 118 of 241 days2002: Moderate 90 of 241 days2002: Unhealthy for Sensitive Groups 21 of 241 days2002: Unhealthy 11 of 241 days2002: Very Unhealthy 1 of 241 days2003: Good 123 of 241 days2003: Moderate 94 of 241 days2003: Unhealthy for Sensitive Groups 18 of 241 days2003: Unhealthy 6 of 241 days2004: Good 148 of 240 days2004: Moderate 86 of 240 days2004: Unhealthy for Sensitive Groups 6 of 240 days2005: Good 102 of 239 days2005: Moderate 105 of 239 days2005: Unhealthy for Sensitive Groups 27 of 239 days2005: Unhealthy 5 of 239 days2006: Good 150 of 229 days2006: Moderate 70 of 229 days2006: Unhealthy for Sensitive Groups 8 of 229 days2006: Unhealthy 1 of 229 days20062007: Good 121 of 241 days2007: Moderate 94 of 241 days2007: Unhealthy for Sensitive Groups 22 of 241 days2007: Unhealthy 3 of 241 days2007: Very Unhealthy 1 of 241 days2008: Good 138 of 234 days2008: Moderate 92 of 234 days2008: Unhealthy for Sensitive Groups 4 of 234 days2009: Good 156 of 240 days2009: Moderate 81 of 240 days2009: Unhealthy for Sensitive Groups 3 of 240 days2010: Good 150 of 243 days2010: Moderate 88 of 243 days2010: Unhealthy for Sensitive Groups 5 of 243 days2011: Good 158 of 243 days2011: Moderate 73 of 243 days2011: Unhealthy for Sensitive Groups 9 of 243 days2011: Unhealthy 3 of 243 days20112012: Good 142 of 244 days2012: Moderate 72 of 244 days2012: Unhealthy for Sensitive Groups 26 of 244 days2012: Unhealthy 3 of 244 days2012: Very Unhealthy 1 of 244 days2013: Good 156 of 240 days2013: Moderate 79 of 240 days2013: Unhealthy for Sensitive Groups 5 of 240 days2014: Good 152 of 239 days2014: Moderate 82 of 239 days2014: Unhealthy for Sensitive Groups 5 of 239 days2015: Good 160 of 243 days2015: Moderate 79 of 243 days2015: Unhealthy for Sensitive Groups 4 of 243 days2016: Good 166 of 242 days2016: Moderate 65 of 242 days2016: Unhealthy for Sensitive Groups 11 of 242 days20162017: Good 212 of 283 days2017: Moderate 68 of 283 days2017: Unhealthy for Sensitive Groups 3 of 283 days2018: Good 208 of 245 days2018: Moderate 29 of 245 days2018: Unhealthy for Sensitive Groups 8 of 245 days2019: Good 232 of 260 days2019: Moderate 26 of 260 days2019: Unhealthy for Sensitive Groups 2 of 260 days2020: Good 217 of 258 days2020: Moderate 34 of 258 days2020: Unhealthy for Sensitive Groups 7 of 258 days2021: Good 209 of 250 days2021: Moderate 38 of 250 days2021: Unhealthy for Sensitive Groups 3 of 250 days20212022: Good 197 of 232 days2022: Moderate 30 of 232 days2022: Unhealthy for Sensitive Groups 4 of 232 days2022: Unhealthy 1 of 232 days2023: Good 181 of 244 days2023: Moderate 52 of 244 days2023: Unhealthy for Sensitive Groups 11 of 244 days2024: Good 200 of 241 days2024: Moderate 40 of 241 days2024: Unhealthy for Sensitive Groups 1 of 241 days2025: Good 212 of 262 days2025: Moderate 47 of 262 days2025: Unhealthy for Sensitive Groups 3 of 262 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 year0501001502001991: 90th percentile AQI 1541992: 90th percentile AQI 711993: 90th percentile AQI 841994: 90th percentile AQI 901995: 90th percentile AQI 1151996: 90th percentile AQI 1331997: 90th percentile AQI 1221998: 90th percentile AQI 1401999: 90th percentile AQI 1332000: 90th percentile AQI 842001: 90th percentile AQI 1082002: 90th percentile AQI 1122003: 90th percentile AQI 1002004: 90th percentile AQI 822005: 90th percentile AQI 1122006: 90th percentile AQI 772007: 90th percentile AQI 1012008: 90th percentile AQI 802009: 90th percentile AQI 732010: 90th percentile AQI 772011: 90th percentile AQI 802012: 90th percentile AQI 1122013: 90th percentile AQI 772014: 90th percentile AQI 742015: 90th percentile AQI 692016: 90th percentile AQI 802017: 90th percentile AQI 642018: 90th percentile AQI 612019: 90th percentile AQI 512020: 90th percentile AQI 612021: 90th percentile AQI 672022: 90th percentile AQI 612023: 90th percentile AQI 802024: 90th percentile AQI 582025: 90th percentile AQI 671991: Median AQI 801992: Median AQI 401993: Median AQI 431994: Median AQI 441995: Median AQI 471996: Median AQI 491997: Median AQI 501998: Median AQI 581999: Median AQI 512000: Median AQI 482001: Median AQI 492002: Median AQI 512003: Median AQI 492004: Median AQI 442005: Median AQI 542006: Median AQI 462007: Median AQI 502008: Median AQI 462009: Median AQI 442010: Median AQI 452011: Median AQI 432012: Median AQI 462013: Median AQI 442014: Median AQI 442015: Median AQI 432016: Median AQI 432017: Median AQI 412018: Median AQI 402019: Median AQI 392020: Median AQI 382021: Median AQI 402022: Median AQI 392023: Median AQI 422024: Median AQI 412025: Median AQI 4119911996200120062011201620212025
  • 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
Ozone262100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20252622124730004167147Ozone
20242412004010004158101Ozone
202324418152110004280143Ozone
20222321973041003961156Ozone
20212502093830004067129Ozone
20202582173470003861150Ozone
20192602322620003951112Ozone
20182452082980004061126Ozone
20172832126830004164112Ozone
201624216665110004380140Ozone
20152431607940004369126Ozone
20142391528250004474133Ozone
20132401567950004477126Ozone
2012244142722631046112208Ozone
20112431587393004380177Ozone
20102431508850004577129Ozone
20092401568130004473136Ozone
20082341389240004680150Ozone
2007241121942231050101201Ozone
20062291507081004677151Ozone
20052391021052750054112177Ozone
20042401488660004482126Ozone
2003241123941860049100190Ozone
20022411189021111051112203Ozone
2001239122872280049108192Ozone
200024313410243004884182Ozone
19992191077522141051133207Ozone
1998177736723131058140212Ozone
1997183955622100050122195Ozone
199618397542093049133215Ozone
1995183105502242047115206Ozone
19941771184685004490161Ozone
199318212842120004384133Ozone
19925647630004071105Ozone
1991113403427111080154204Ozone

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 1991–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem