EnviroNearby

Huntington County, Indiana air quality history

Daily Air Quality Index summaries from EPA monitors in Huntington, Indiana, 1990–2019.

97%
Good days in 2019
31
Median daily AQI, 2019
0
Days above 100 in 2019
355
Days with an AQI in 2019 (of 365)

In 2019, EPA reported a daily Air Quality Index (AQI) for Huntington, Indiana on 355 days. 345 of those days (97%) were in the Good range, and the median daily AQI was 31. That median is lower than the typical monitored county in Indiana (median 40.5 across 34 counties), and lower than the typical monitored U.S. county (41). The main pollutant was ozone on 355 days. Across the years with fuller monitoring, the share of Good days rose: an average of 58% in 1990–2000 versus 95% in 2017–2019.

The most recent year with data for this county is 2019; EPA's files for 2020–2025 contain no row for it, which usually means its monitors stopped reporting.

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%1990: Good 85 of 151 days1990: Moderate 38 of 151 days1990: Unhealthy for Sensitive Groups 23 of 151 days1990: Unhealthy 4 of 151 days1990: Very Unhealthy 1 of 151 days19901991: Good 110 of 192 days1991: Moderate 54 of 192 days1991: Unhealthy for Sensitive Groups 24 of 192 days1991: Unhealthy 4 of 192 days2000: Good 103 of 170 days2000: Moderate 57 of 170 days2000: Unhealthy for Sensitive Groups 6 of 170 days2000: Unhealthy 4 of 170 days20002001: Good 112 of 183 days2001: Moderate 56 of 183 days2001: Unhealthy for Sensitive Groups 15 of 183 days2002: Good 104 of 183 days2002: Moderate 55 of 183 days2002: Unhealthy for Sensitive Groups 15 of 183 days2002: Unhealthy 9 of 183 days20022003: Good 99 of 183 days2003: Moderate 69 of 183 days2003: Unhealthy for Sensitive Groups 12 of 183 days2003: Unhealthy 3 of 183 days2004: Good 151 of 174 days2004: Moderate 20 of 174 days2004: Unhealthy for Sensitive Groups 3 of 174 days20042005: Good 95 of 171 days2005: Moderate 60 of 171 days2005: Unhealthy for Sensitive Groups 16 of 171 days2006: Good 124 of 177 days2006: Moderate 47 of 177 days2006: Unhealthy for Sensitive Groups 6 of 177 days20062007: Good 112 of 182 days2007: Moderate 59 of 182 days2007: Unhealthy for Sensitive Groups 11 of 182 days2008: Good 159 of 182 days2008: Moderate 23 of 182 days20082009: Good 158 of 183 days2009: Moderate 25 of 183 days2010: Good 159 of 182 days2010: Moderate 23 of 182 days20102011: Good 151 of 183 days2011: Moderate 30 of 183 days2011: Unhealthy for Sensitive Groups 2 of 183 days2012: Good 140 of 180 days2012: Moderate 38 of 180 days2012: Unhealthy for Sensitive Groups 2 of 180 days20122013: Good 177 of 183 days2013: Moderate 6 of 183 days2014: Good 168 of 176 days2014: Moderate 8 of 176 days20142015: Good 175 of 178 days2015: Moderate 3 of 178 days2016: Good 156 of 180 days2016: Moderate 23 of 180 days2016: Unhealthy for Sensitive Groups 1 of 180 days20162017: Good 227 of 245 days2017: Moderate 18 of 245 days2018: Good 337 of 358 days2018: Moderate 21 of 358 days20182019: Good 345 of 355 days2019: Moderate 10 of 355 days2019
  • 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 year0501001501990: 90th percentile AQI 1191991: 90th percentile AQI 1082000: 90th percentile AQI 932001: 90th percentile AQI 972002: 90th percentile AQI 1222003: 90th percentile AQI 1002004: 90th percentile AQI 642005: 90th percentile AQI 972006: 90th percentile AQI 742007: 90th percentile AQI 902008: 90th percentile AQI 542009: 90th percentile AQI 512010: 90th percentile AQI 542011: 90th percentile AQI 642012: 90th percentile AQI 712013: 90th percentile AQI 462014: 90th percentile AQI 462015: 90th percentile AQI 402016: 90th percentile AQI 642017: 90th percentile AQI 502018: 90th percentile AQI 462019: 90th percentile AQI 441990: Median AQI 491991: Median AQI 472000: Median AQI 482001: Median AQI 462002: Median AQI 472003: Median AQI 492004: Median AQI 412005: Median AQI 482006: Median AQI 452007: Median AQI 462008: Median AQI 402009: Median AQI 392010: Median AQI 412011: Median AQI 432012: Median AQI 422013: Median AQI 362014: Median AQI 352015: Median AQI 312016: Median AQI 372017: Median AQI 392018: Median AQI 312019: Median AQI 31199020002002200420062008201020122014201620182019
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2019

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
Ozone355100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2019355345100000314484Ozone
2018358337210000314697Ozone
20172452271800003950100Ozone
20161801562310003764105Ozone
201517817530000314071Ozone
201417616880000354680Ozone
201318317760000364677Ozone
20121801403820004271126Ozone
20111831513020004364115Ozone
2010182159230000415490Ozone
2009183158250000395180Ozone
2008182159230000405484Ozone
200718211259110004690140Ozone
20061771244760004574119Ozone
20051719560160004897140Ozone
20041741512030004164115Ozone
200318399691230049100200Ozone
2002183104551590047122161Ozone
200118311256150004697150Ozone
20001701035764004893169Ozone
1991192110542440047108169Ozone
199015185382341049119202Ozone

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 2019

All monitored counties in Indiana

Source: U.S. EPA AirData, “Annual AQI by County” files for 1990–2019 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem