EnviroNearby

Wabash County, Indiana air quality history

Daily Air Quality Index summaries from EPA monitors in Wabash, Indiana, 1988–2025.

92%
Good days in 2025
34
Median daily AQI, 2025
1
Days above 100 in 2025
351
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Wabash, Indiana on 351 days. 323 of those days (92%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in Indiana (median 41 across 33 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 351 days. Across the years with fuller monitoring, the share of Good days rose: an average of 74% in 1990–1992 versus 89% in 2023–2025.

Years with fewer than 120 monitored days (1988) 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%1988: Good 87 of 88 days1988: Moderate 1 of 88 days19881990: Good 258 of 355 days1990: Moderate 66 of 355 days1990: Unhealthy for Sensitive Groups 27 of 355 days1990: Unhealthy 4 of 355 days1991: Good 248 of 361 days1991: Moderate 69 of 361 days1991: Unhealthy for Sensitive Groups 36 of 361 days1991: Unhealthy 8 of 361 days1992: Good 295 of 360 days1992: Moderate 48 of 360 days1992: Unhealthy for Sensitive Groups 13 of 360 days1992: Unhealthy 4 of 360 days1993: Good 349 of 360 days1993: Moderate 11 of 360 days1994: Good 254 of 349 days1994: Moderate 60 of 349 days1994: Unhealthy for Sensitive Groups 30 of 349 days1994: Unhealthy 5 of 349 days19941995: Good 162 of 269 days1995: Moderate 69 of 269 days1995: Unhealthy for Sensitive Groups 30 of 269 days1995: Unhealthy 8 of 269 days1996: Good 140 of 213 days1996: Moderate 46 of 213 days1996: Unhealthy for Sensitive Groups 20 of 213 days1996: Unhealthy 7 of 213 days1997: Good 283 of 361 days1997: Moderate 52 of 361 days1997: Unhealthy for Sensitive Groups 23 of 361 days1997: Unhealthy 3 of 361 days1998: Good 233 of 355 days1998: Moderate 93 of 355 days1998: Unhealthy for Sensitive Groups 27 of 355 days1998: Unhealthy 2 of 355 days1999: Good 251 of 361 days1999: Moderate 67 of 361 days1999: Unhealthy for Sensitive Groups 33 of 361 days1999: Unhealthy 10 of 361 days19992000: Good 278 of 362 days2000: Moderate 71 of 362 days2000: Unhealthy for Sensitive Groups 10 of 362 days2000: Unhealthy 3 of 362 days2001: Good 288 of 363 days2001: Moderate 63 of 363 days2001: Unhealthy for Sensitive Groups 10 of 363 days2001: Unhealthy 2 of 363 days2002: Good 274 of 362 days2002: Moderate 59 of 362 days2002: Unhealthy for Sensitive Groups 19 of 362 days2002: Unhealthy 10 of 362 days2003: Good 276 of 348 days2003: Moderate 62 of 348 days2003: Unhealthy for Sensitive Groups 7 of 348 days2003: Unhealthy 3 of 348 days2004: Good 308 of 349 days2004: Moderate 37 of 349 days2004: Unhealthy for Sensitive Groups 4 of 349 days20042005: Good 274 of 358 days2005: Moderate 67 of 358 days2005: Unhealthy for Sensitive Groups 17 of 358 days2006: Good 289 of 333 days2006: Moderate 43 of 333 days2006: Unhealthy for Sensitive Groups 1 of 333 days2007: Good 273 of 356 days2007: Moderate 62 of 356 days2007: Unhealthy for Sensitive Groups 21 of 356 days2008: Good 301 of 340 days2008: Moderate 38 of 340 days2008: Unhealthy for Sensitive Groups 1 of 340 days2009: Good 321 of 357 days2009: Moderate 36 of 357 days20092010: Good 316 of 357 days2010: Moderate 39 of 357 days2010: Unhealthy for Sensitive Groups 2 of 357 days2011: Good 278 of 336 days2011: Moderate 51 of 336 days2011: Unhealthy for Sensitive Groups 7 of 336 days2012: Good 266 of 355 days2012: Moderate 65 of 355 days2012: Unhealthy for Sensitive Groups 23 of 355 days2012: Unhealthy 1 of 355 days2013: Good 309 of 353 days2013: Moderate 42 of 353 days2013: Unhealthy for Sensitive Groups 2 of 353 days2014: Good 304 of 336 days2014: Moderate 30 of 336 days2014: Unhealthy for Sensitive Groups 2 of 336 days20142015: Good 330 of 358 days2015: Moderate 26 of 358 days2015: Unhealthy for Sensitive Groups 2 of 358 days2016: Good 309 of 347 days2016: Moderate 33 of 347 days2016: Unhealthy for Sensitive Groups 5 of 347 days2017: Good 302 of 332 days2017: Moderate 29 of 332 days2017: Unhealthy for Sensitive Groups 1 of 332 days2018: Good 315 of 362 days2018: Moderate 42 of 362 days2018: Unhealthy for Sensitive Groups 5 of 362 days2019: Good 319 of 351 days2019: Moderate 32 of 351 days20192020: Good 337 of 363 days2020: Moderate 26 of 363 days2021: Good 327 of 362 days2021: Moderate 34 of 362 days2021: Unhealthy for Sensitive Groups 1 of 362 days2022: Good 334 of 362 days2022: Moderate 27 of 362 days2022: Unhealthy for Sensitive Groups 1 of 362 days2023: Good 313 of 364 days2023: Moderate 48 of 364 days2023: Unhealthy for Sensitive Groups 3 of 364 days2024: Good 324 of 365 days2024: Moderate 41 of 365 days20242025: Good 323 of 351 days2025: Moderate 27 of 351 days2025: Unhealthy for Sensitive Groups 1 of 351 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 year0501001501988: 90th percentile AQI 371990: 90th percentile AQI 931991: 90th percentile AQI 1011992: 90th percentile AQI 771993: 90th percentile AQI 461994: 90th percentile AQI 1011995: 90th percentile AQI 1121996: 90th percentile AQI 1081997: 90th percentile AQI 901998: 90th percentile AQI 931999: 90th percentile AQI 1082000: 90th percentile AQI 772001: 90th percentile AQI 742002: 90th percentile AQI 902003: 90th percentile AQI 712004: 90th percentile AQI 542005: 90th percentile AQI 842006: 90th percentile AQI 582007: 90th percentile AQI 872008: 90th percentile AQI 512009: 90th percentile AQI 512010: 90th percentile AQI 542011: 90th percentile AQI 672012: 90th percentile AQI 802013: 90th percentile AQI 542014: 90th percentile AQI 502015: 90th percentile AQI 492016: 90th percentile AQI 512017: 90th percentile AQI 502018: 90th percentile AQI 542019: 90th percentile AQI 502020: 90th percentile AQI 492021: 90th percentile AQI 502022: 90th percentile AQI 492023: 90th percentile AQI 582024: 90th percentile AQI 512025: 90th percentile AQI 491988: Median AQI 291990: Median AQI 391991: Median AQI 391992: Median AQI 351993: Median AQI 301994: Median AQI 381995: Median AQI 441996: Median AQI 421997: Median AQI 371998: Median AQI 401999: Median AQI 402000: Median AQI 382001: Median AQI 362002: Median AQI 362003: Median AQI 372004: Median AQI 352005: Median AQI 372006: Median AQI 342007: Median AQI 382008: Median AQI 372009: Median AQI 332010: Median AQI 382011: Median AQI 372012: Median AQI 372013: Median AQI 352014: Median AQI 362015: Median AQI 352016: Median AQI 352017: Median AQI 352018: Median AQI 352019: Median AQI 372020: Median AQI 352021: Median AQI 352022: Median AQI 372023: Median AQI 362024: Median AQI 362025: Median AQI 34198819941999200420092014201920242025
  • 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
Ozone351100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253513232710003449112Ozone
2024365324410000365184Ozone
20233643134830003658126Ozone
20223623342710003749112Ozone
20213623273410003550101Ozone
2020363337260000354997Ozone
2019351319320000375097Ozone
20183623154250003554129Ozone
20173323022910003550105Ozone
20163473093350003551115Ozone
20153583302620003549126Ozone
20143363043020003650108Ozone
20133533094220003554105Ozone
201235526665231003780169Ozone
20113362785170003767129Ozone
20103573163920003854105Ozone
20093573213600003351100Ozone
20083403013810003751101Ozone
200735627362210003887147Ozone
20063332894310003458105Ozone
200535827467170003784126Ozone
20043493083740003554122Ozone
20033482766273003771195Ozone
2002362274591910003690177Ozone
200136328863102003674177Ozone
200036227871103003877174Ozone
19993612516733100040108187Ozone
199835523393272004093185Ozone
199736128352233003790156Ozone
1996213140462070042108177Ozone
1995269162693080044112177Ozone
1994349254603050038101185Ozone
1993360349110000304690Ozone
199236029548134003577177Ozone
1991361248693680039101190Ozone
199035525866274003993195Ozone
1988888710000293777Ozone

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 Indiana with a similar median AQI in 2025

All monitored counties in Indiana

Source: U.S. EPA AirData, “Annual AQI by County” files for 1988–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem