EnviroNearby

Cleveland County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Cleveland, Oklahoma, 1980–2025.

57%
Good days in 2025
48
Median daily AQI, 2025
3
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Cleveland, Oklahoma on 364 days. 207 of those days (57%) were in the Good range, and the median daily AQI was 48. That median is higher than 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 fine particles (PM2.5) on 194 days. Across the years with fuller monitoring, the share of Good days fell: an average of 86% in 1980–1982 versus 51% 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%1980: Good 259 of 331 days1980: Moderate 49 of 331 days1980: Unhealthy for Sensitive Groups 16 of 331 days1980: Unhealthy 7 of 331 days19801981: Good 202 of 219 days1981: Moderate 17 of 219 days1982: Good 242 of 274 days1982: Moderate 31 of 274 days1982: Unhealthy for Sensitive Groups 1 of 274 days1983: Good 317 of 364 days1983: Moderate 43 of 364 days1983: Unhealthy for Sensitive Groups 4 of 364 days1984: Good 262 of 360 days1984: Moderate 76 of 360 days1984: Unhealthy for Sensitive Groups 21 of 360 days1984: Unhealthy 1 of 360 days1985: Good 296 of 362 days1985: Moderate 63 of 362 days1985: Unhealthy for Sensitive Groups 3 of 362 days19851986: Good 302 of 365 days1986: Moderate 59 of 365 days1986: Unhealthy for Sensitive Groups 4 of 365 days1987: Good 273 of 332 days1987: Moderate 57 of 332 days1987: Unhealthy for Sensitive Groups 2 of 332 days1988: Good 135 of 184 days1988: Moderate 40 of 184 days1988: Unhealthy for Sensitive Groups 9 of 184 days1989: Good 267 of 365 days1989: Moderate 90 of 365 days1989: Unhealthy for Sensitive Groups 8 of 365 days1990: Good 291 of 365 days1990: Moderate 63 of 365 days1990: Unhealthy for Sensitive Groups 11 of 365 days19901991: Good 280 of 365 days1991: Moderate 67 of 365 days1991: Unhealthy for Sensitive Groups 18 of 365 days1992: Good 333 of 364 days1992: Moderate 28 of 364 days1992: Unhealthy for Sensitive Groups 3 of 364 days1993: Good 340 of 365 days1993: Moderate 25 of 365 days1994: Good 285 of 365 days1994: Moderate 69 of 365 days1994: Unhealthy for Sensitive Groups 11 of 365 days1995: Good 276 of 365 days1995: Moderate 64 of 365 days1995: Unhealthy for Sensitive Groups 22 of 365 days1995: Unhealthy 3 of 365 days19951996: Good 287 of 366 days1996: Moderate 69 of 366 days1996: Unhealthy for Sensitive Groups 10 of 366 days1997: Good 278 of 359 days1997: Moderate 68 of 359 days1997: Unhealthy for Sensitive Groups 12 of 359 days1997: Unhealthy 1 of 359 days1998: Good 236 of 361 days1998: Moderate 88 of 361 days1998: Unhealthy for Sensitive Groups 32 of 361 days1998: Unhealthy 4 of 361 days1998: Very Unhealthy 1 of 361 days1999: Good 284 of 365 days1999: Moderate 62 of 365 days1999: Unhealthy for Sensitive Groups 18 of 365 days1999: Unhealthy 1 of 365 days2000: Good 271 of 363 days2000: Moderate 71 of 363 days2000: Unhealthy for Sensitive Groups 19 of 363 days2000: Unhealthy 2 of 363 days20002001: Good 259 of 361 days2001: Moderate 87 of 361 days2001: Unhealthy for Sensitive Groups 15 of 361 days2002: Good 291 of 363 days2002: Moderate 63 of 363 days2002: Unhealthy for Sensitive Groups 9 of 363 days2003: Good 286 of 361 days2003: Moderate 65 of 361 days2003: Unhealthy for Sensitive Groups 9 of 361 days2003: Unhealthy 1 of 361 days2004: Good 299 of 361 days2004: Moderate 59 of 361 days2004: Unhealthy for Sensitive Groups 3 of 361 days2005: Good 284 of 365 days2005: Moderate 66 of 365 days2005: Unhealthy for Sensitive Groups 15 of 365 days20052006: Good 272 of 364 days2006: Moderate 64 of 364 days2006: Unhealthy for Sensitive Groups 28 of 364 days2007: Good 315 of 355 days2007: Moderate 36 of 355 days2007: Unhealthy for Sensitive Groups 4 of 355 days2008: Good 314 of 363 days2008: Moderate 47 of 363 days2008: Unhealthy for Sensitive Groups 2 of 363 days2009: Good 151 of 365 days2009: Moderate 213 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 157 of 364 days2010: Moderate 206 of 364 days2010: Unhealthy for Sensitive Groups 1 of 364 days20102011: Good 107 of 360 days2011: Moderate 231 of 360 days2011: Unhealthy for Sensitive Groups 21 of 360 days2011: Unhealthy 1 of 360 days2012: Good 116 of 362 days2012: Moderate 227 of 362 days2012: Unhealthy for Sensitive Groups 18 of 362 days2012: Unhealthy 1 of 362 days2013: Good 159 of 355 days2013: Moderate 194 of 355 days2013: Unhealthy for Sensitive Groups 2 of 355 days2014: Good 189 of 365 days2014: Moderate 174 of 365 days2014: Unhealthy for Sensitive Groups 2 of 365 days2015: Good 220 of 364 days2015: Moderate 144 of 364 days20152016: Good 251 of 365 days2016: Moderate 113 of 365 days2016: Unhealthy for Sensitive Groups 1 of 365 days2017: Good 215 of 362 days2017: Moderate 145 of 362 days2017: Unhealthy for Sensitive Groups 2 of 362 days2018: Good 159 of 365 days2018: Moderate 200 of 365 days2018: Unhealthy for Sensitive Groups 6 of 365 days2019: Good 160 of 365 days2019: Moderate 205 of 365 days2020: Good 175 of 354 days2020: Moderate 177 of 354 days2020: Unhealthy for Sensitive Groups 2 of 354 days20202021: Good 144 of 362 days2021: Moderate 215 of 362 days2021: Unhealthy for Sensitive Groups 3 of 362 days2022: Good 182 of 348 days2022: Moderate 162 of 348 days2022: Unhealthy for Sensitive Groups 4 of 348 days2023: Good 163 of 355 days2023: Moderate 188 of 355 days2023: Unhealthy for Sensitive Groups 4 of 355 days2024: Good 177 of 359 days2024: Moderate 173 of 359 days2024: Unhealthy for Sensitive Groups 9 of 359 days2025: Good 207 of 364 days2025: Moderate 154 of 364 days2025: Unhealthy for Sensitive Groups 3 of 364 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 year0501001501980: 90th percentile AQI 841981: 90th percentile AQI 481982: 90th percentile AQI 521983: 90th percentile AQI 611984: 90th percentile AQI 871985: 90th percentile AQI 561986: 90th percentile AQI 581987: 90th percentile AQI 571988: 90th percentile AQI 841989: 90th percentile AQI 711990: 90th percentile AQI 711991: 90th percentile AQI 771992: 90th percentile AQI 491993: 90th percentile AQI 481994: 90th percentile AQI 741995: 90th percentile AQI 871996: 90th percentile AQI 711997: 90th percentile AQI 771998: 90th percentile AQI 1011999: 90th percentile AQI 802000: 90th percentile AQI 842001: 90th percentile AQI 802002: 90th percentile AQI 712003: 90th percentile AQI 742004: 90th percentile AQI 642005: 90th percentile AQI 772006: 90th percentile AQI 902007: 90th percentile AQI 512008: 90th percentile AQI 582009: 90th percentile AQI 692010: 90th percentile AQI 682011: 90th percentile AQI 932012: 90th percentile AQI 902013: 90th percentile AQI 672014: 90th percentile AQI 702015: 90th percentile AQI 642016: 90th percentile AQI 592017: 90th percentile AQI 672018: 90th percentile AQI 712019: 90th percentile AQI 672020: 90th percentile AQI 672021: 90th percentile AQI 682022: 90th percentile AQI 682023: 90th percentile AQI 742024: 90th percentile AQI 742025: 90th percentile AQI 651980: Median AQI 341981: Median AQI 311982: Median AQI 311983: Median AQI 351984: Median AQI 421985: Median AQI 411986: Median AQI 371987: Median AQI 361988: Median AQI 401989: Median AQI 421990: Median AQI 381991: Median AQI 401992: Median AQI 341993: Median AQI 321994: Median AQI 401995: Median AQI 401996: Median AQI 411997: Median AQI 411998: Median AQI 431999: Median AQI 422000: Median AQI 392001: Median AQI 392002: Median AQI 372003: Median AQI 382004: Median AQI 352005: Median AQI 372006: Median AQI 402007: Median AQI 342008: Median AQI 372009: Median AQI 532010: Median AQI 522011: Median AQI 562012: Median AQI 562013: Median AQI 532014: Median AQI 502015: Median AQI 452016: Median AQI 442017: Median AQI 472018: Median AQI 522019: Median AQI 522020: Median AQI 512021: Median AQI 532022: Median AQI 492023: Median AQI 522024: Median AQI 512025: Median AQI 481980198519901995200020052010201520202025
  • 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
Fine particles (PM2.5)19453%
Ozone17047%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536420715430004865130PM2.5
202435917717390005174126Ozone
202335516318840005274143PM2.5
202234818216240004968105PM2.5
202136214421530005368129PM2.5
202035417517720005167121PM2.5
20193651602050000526790PM2.5
201836515920060005271121PM2.5
201736221514520004767105Ozone
201636525111310004459101Ozone
20153642201440000456487Ozone
201436518917420005070101PM2.5
201335515919420005367112PM2.5
2012362116227181005690156PM2.5
2011360107231211005693151PM2.5
201036415720610005268112PM2.5
200936515121310005369101PM2.5
20083633144720003758101Ozone
20073553153640003451112Ozone
200636427264280004090147Ozone
200536528466150003777136Ozone
20043612995930003564140Ozone
20033612866591003874151Ozone
20023632916390003771150Ozone
200136125987150003980147Ozone
200036327171192003984154Ozone
199936528462181004280156Ozone
1998361236883241043101201Ozone
199735927868121004177177Ozone
199636628769100004171147Ozone
199536527664223004087185Ozone
199436528569110004074147Ozone
1993365340250000324890Ozone
19923643332830003449115Ozone
199136528067180004077147Ozone
199036529163110003871143Ozone
19893652679080004271126Ozone
19881841354090004084140Ozone
19873322735720003657105NO2
19863653025940003758119NO2
19853622966330004156136NO2
198436026276211004287151NO2
19833643174340003561147Ozone
19822742423110003152108Ozone
1981219202170000314880Ozone
198033125949167003484187Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem