EnviroNearby

Comanche County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Comanche, Oklahoma, 1988–2025.

67%
Good days in 2025
44
Median daily AQI, 2025
4
Days above 100 in 2025
358
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Comanche, Oklahoma on 358 days. 239 of those days (67%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Oklahoma (median 44 across 19 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 205 days. Across the years with fuller monitoring, the share of Good days fell: an average of 97% in 1989–1993 versus 65% in 2023–2025.

Years with fewer than 120 monitored days (1988, 1990, 1991) 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 69 of 77 days1988: Moderate 8 of 77 days19881989: Good 132 of 142 days1989: Moderate 10 of 142 days1990: Good 52 of 57 days1990: Moderate 5 of 57 days1991: Good 55 of 56 days1991: Moderate 1 of 56 days1992: Good 253 of 253 days1993: Good 359 of 365 days1993: Moderate 6 of 365 days19931994: Good 289 of 365 days1994: Moderate 62 of 365 days1994: Unhealthy for Sensitive Groups 14 of 365 days1995: Good 283 of 365 days1995: Moderate 69 of 365 days1995: Unhealthy for Sensitive Groups 12 of 365 days1995: Unhealthy 1 of 365 days1996: Good 157 of 177 days1996: Moderate 19 of 177 days1996: Unhealthy for Sensitive Groups 1 of 177 days1997: Good 135 of 144 days1997: Moderate 9 of 144 days1998: Good 250 of 365 days1998: Moderate 80 of 365 days1998: Unhealthy for Sensitive Groups 33 of 365 days1998: Unhealthy 2 of 365 days19981999: Good 272 of 365 days1999: Moderate 66 of 365 days1999: Unhealthy for Sensitive Groups 27 of 365 days2000: Good 229 of 366 days2000: Moderate 108 of 366 days2000: Unhealthy for Sensitive Groups 26 of 366 days2000: Unhealthy 3 of 366 days2001: Good 238 of 365 days2001: Moderate 102 of 365 days2001: Unhealthy for Sensitive Groups 25 of 365 days2002: Good 260 of 365 days2002: Moderate 91 of 365 days2002: Unhealthy for Sensitive Groups 14 of 365 days2003: Good 260 of 365 days2003: Moderate 95 of 365 days2003: Unhealthy for Sensitive Groups 9 of 365 days2003: Unhealthy 1 of 365 days20032004: Good 257 of 365 days2004: Moderate 96 of 365 days2004: Unhealthy for Sensitive Groups 11 of 365 days2004: Unhealthy 1 of 365 days2005: Good 261 of 365 days2005: Moderate 85 of 365 days2005: Unhealthy for Sensitive Groups 19 of 365 days2006: Good 235 of 334 days2006: Moderate 74 of 334 days2006: Unhealthy for Sensitive Groups 23 of 334 days2006: Unhealthy 2 of 334 days2007: Good 293 of 362 days2007: Moderate 64 of 362 days2007: Unhealthy for Sensitive Groups 5 of 362 days2008: Good 278 of 364 days2008: Moderate 83 of 364 days2008: Unhealthy for Sensitive Groups 3 of 364 days20082009: Good 120 of 360 days2009: Moderate 237 of 360 days2009: Unhealthy for Sensitive Groups 3 of 360 days2010: Good 174 of 365 days2010: Moderate 189 of 365 days2010: Unhealthy for Sensitive Groups 2 of 365 days2011: Good 141 of 364 days2011: Moderate 205 of 364 days2011: Unhealthy for Sensitive Groups 18 of 364 days2012: Good 149 of 364 days2012: Moderate 208 of 364 days2012: Unhealthy for Sensitive Groups 6 of 364 days2012: Unhealthy 1 of 364 days2013: Good 199 of 365 days2013: Moderate 160 of 365 days2013: Unhealthy for Sensitive Groups 6 of 365 days20132014: Good 208 of 365 days2014: Moderate 156 of 365 days2014: Unhealthy for Sensitive Groups 1 of 365 days2015: Good 247 of 364 days2015: Moderate 117 of 364 days2016: Good 277 of 366 days2016: Moderate 89 of 366 days2017: Good 249 of 365 days2017: Moderate 115 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2018: Good 240 of 365 days2018: Moderate 121 of 365 days2018: Unhealthy for Sensitive Groups 4 of 365 days20182019: Good 220 of 365 days2019: Moderate 145 of 365 days2020: Good 262 of 366 days2020: Moderate 103 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days2021: Good 223 of 364 days2021: Moderate 139 of 364 days2021: Unhealthy for Sensitive Groups 2 of 364 days2022: Good 205 of 353 days2022: Moderate 146 of 353 days2022: Unhealthy for Sensitive Groups 2 of 353 days2023: Good 216 of 357 days2023: Moderate 137 of 357 days2023: Unhealthy for Sensitive Groups 4 of 357 days20232024: Good 242 of 362 days2024: Moderate 113 of 362 days2024: Unhealthy for Sensitive Groups 6 of 362 days2024: Hazardous 1 of 362 days2025: Good 239 of 358 days2025: Moderate 115 of 358 days2025: Unhealthy for Sensitive Groups 4 of 358 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 year0501001988: 90th percentile AQI 511989: 90th percentile AQI 491990: 90th percentile AQI 471991: 90th percentile AQI 401992: 90th percentile AQI 321993: 90th percentile AQI 351994: 90th percentile AQI 741995: 90th percentile AQI 771996: 90th percentile AQI 541997: 90th percentile AQI 421998: 90th percentile AQI 971999: 90th percentile AQI 872000: 90th percentile AQI 972001: 90th percentile AQI 902002: 90th percentile AQI 802003: 90th percentile AQI 742004: 90th percentile AQI 762005: 90th percentile AQI 872006: 90th percentile AQI 902007: 90th percentile AQI 642008: 90th percentile AQI 642009: 90th percentile AQI 772010: 90th percentile AQI 672011: 90th percentile AQI 872012: 90th percentile AQI 802013: 90th percentile AQI 742014: 90th percentile AQI 682015: 90th percentile AQI 612016: 90th percentile AQI 572017: 90th percentile AQI 592018: 90th percentile AQI 672019: 90th percentile AQI 642020: 90th percentile AQI 602021: 90th percentile AQI 632022: 90th percentile AQI 712023: 90th percentile AQI 712024: 90th percentile AQI 772025: 90th percentile AQI 671988: Median AQI 271989: Median AQI 261990: Median AQI 231991: Median AQI 251992: Median AQI 141993: Median AQI 151994: Median AQI 371995: Median AQI 401996: Median AQI 361997: Median AQI 281998: Median AQI 411999: Median AQI 412000: Median AQI 442001: Median AQI 442002: Median AQI 402003: Median AQI 442004: Median AQI 402005: Median AQI 412006: Median AQI 432007: Median AQI 392008: Median AQI 412009: Median AQI 562010: Median AQI 522011: Median AQI 542012: Median AQI 542013: Median AQI 482014: Median AQI 472015: Median AQI 442016: Median AQI 422017: Median AQI 442018: Median AQI 442019: Median AQI 472020: Median AQI 442021: Median AQI 472022: Median AQI 472023: Median AQI 462024: Median AQI 432025: Median AQI 44198819931998200320082013201820232025
  • 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
Ozone20557%
Fine particles (PM2.5)15343%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202535823911540004467131Ozone
202436224211360014377339Ozone
202335721613740004671126Ozone
202235320514620004771126Ozone
202136422313920004763124PM2.5
202036626210310004460107PM2.5
20193652201450000476497PM2.5
201836524012140004467122Ozone
201736524911510004459115PM2.5
2016366277890000425787Ozone
20153642471170000446197Ozone
201436520815610004768105Ozone
201336519916060004874119Ozone
201236414920861005480151PM2.5
2011364141205180005487143PM2.5
201036517418920005267136PM2.5
200936012023730005677119PM2.5
20083642788330004164133Ozone
20073622936450003964126Ozone
200633423574232004390156Ozone
200536526185190004187150Ozone
200436525796111004076151Ozone
20033652609591004474151Ozone
200236526091140004080140Ozone
2001365238102250004490150Ozone
2000366229108263004497169Ozone
199936527266270004187147Ozone
199836525080332004197166Ozone
199714413590000284274Ozone
19961771571910003654133Ozone
199536528369121004077159Ozone
199436528962140003774140Ozone
199336535960000153590NO2
199225325300000143249CO
1991565510000254059PM10
1990575250000234773PM10
1989142132100000264970PM10
1988776980000275175PM10

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 Oklahoma with a similar median AQI in 2025

All monitored counties in Oklahoma

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