EnviroNearby

Cherokee County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Cherokee, Oklahoma, 1999–2017.

93%
Good days in 2017
39
Median daily AQI, 2017
0
Days above 100 in 2017
280
Days with an AQI in 2017 (of 365)

In 2017, EPA reported a daily Air Quality Index (AQI) for Cherokee, Oklahoma on 280 days. 261 of those days (93%) were in the Good range, and the median daily AQI was 39. That median is lower than the typical monitored county in Oklahoma (median 42 across 24 counties), and about the same as the typical monitored U.S. county (41). The main pollutant was ozone on 280 days. Across the years with fuller monitoring, the share of Good days rose: an average of 65% in 1999–2001 versus 93% in 2015–2017.

EPA did not report an AQI for every day of 2017 here (280 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.

The most recent year with data for this county is 2017; EPA's files for 2018–2025 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%1999: Good 106 of 183 days1999: Moderate 45 of 183 days1999: Unhealthy for Sensitive Groups 26 of 183 days1999: Unhealthy 6 of 183 days19992000: Good 241 of 366 days2000: Moderate 94 of 366 days2000: Unhealthy for Sensitive Groups 26 of 366 days2000: Unhealthy 5 of 366 days2001: Good 257 of 365 days2001: Moderate 98 of 365 days2001: Unhealthy for Sensitive Groups 10 of 365 days20012002: Good 274 of 365 days2002: Moderate 84 of 365 days2002: Unhealthy for Sensitive Groups 7 of 365 days2003: Good 255 of 365 days2003: Moderate 101 of 365 days2003: Unhealthy for Sensitive Groups 8 of 365 days2003: Unhealthy 1 of 365 days20032004: Good 283 of 366 days2004: Moderate 76 of 366 days2004: Unhealthy for Sensitive Groups 7 of 366 days2005: Good 240 of 365 days2005: Moderate 113 of 365 days2005: Unhealthy for Sensitive Groups 12 of 365 days20052006: Good 249 of 365 days2006: Moderate 104 of 365 days2006: Unhealthy for Sensitive Groups 10 of 365 days2006: Unhealthy 2 of 365 days2007: Good 274 of 365 days2007: Moderate 85 of 365 days2007: Unhealthy for Sensitive Groups 6 of 365 days20072008: Good 306 of 366 days2008: Moderate 59 of 366 days2008: Unhealthy for Sensitive Groups 1 of 366 days2009: Good 277 of 328 days2009: Moderate 50 of 328 days2009: Unhealthy for Sensitive Groups 1 of 328 days20092010: Good 227 of 294 days2010: Moderate 62 of 294 days2010: Unhealthy for Sensitive Groups 4 of 294 days2010: Unhealthy 1 of 294 days2011: Good 206 of 292 days2011: Moderate 69 of 292 days2011: Unhealthy for Sensitive Groups 17 of 292 days20112012: Good 188 of 283 days2012: Moderate 79 of 283 days2012: Unhealthy for Sensitive Groups 16 of 283 days2013: Good 245 of 289 days2013: Moderate 43 of 289 days2013: Unhealthy for Sensitive Groups 1 of 289 days20132014: Good 259 of 284 days2014: Moderate 25 of 284 days2015: Good 256 of 278 days2015: Moderate 22 of 278 days20152016: Good 250 of 269 days2016: Moderate 19 of 269 days2017: Good 261 of 280 days2017: Moderate 19 of 280 days2017
  • 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 year0501001501999: 90th percentile AQI 1222000: 90th percentile AQI 942001: 90th percentile AQI 772002: 90th percentile AQI 712003: 90th percentile AQI 742004: 90th percentile AQI 662005: 90th percentile AQI 802006: 90th percentile AQI 832007: 90th percentile AQI 672008: 90th percentile AQI 612009: 90th percentile AQI 612010: 90th percentile AQI 712011: 90th percentile AQI 842012: 90th percentile AQI 872013: 90th percentile AQI 642014: 90th percentile AQI 502015: 90th percentile AQI 482016: 90th percentile AQI 492017: 90th percentile AQI 491999: Median AQI 452000: Median AQI 422001: Median AQI 412002: Median AQI 382003: Median AQI 422004: Median AQI 392005: Median AQI 442006: Median AQI 422007: Median AQI 392008: Median AQI 372009: Median AQI 382010: Median AQI 402011: Median AQI 432012: Median AQI 442013: Median AQI 402014: Median AQI 382015: Median AQI 372016: Median AQI 382017: Median AQI 391999200120032005200720092011201320152017
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2017

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
Ozone280100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2017280261190000394971Ozone
2016269250190000384977Ozone
2015278256220000374893Ozone
2014284259250000385077Ozone
20132892454310004064101Ozone
201228318879160004487140Ozone
201129220669170004384143Ozone
20102942276241004071151Ozone
20093282775010003861105Ozone
20083663065910003761108Ozone
20073652748560003967129Ozone
2006365249104102004283182Ozone
2005365240113120004480133Ozone
20043662837670003966122Ozone
200336525510181004274151Ozone
20023652748470003871140Ozone
200136525798100004177143Ozone
200036624194265004294185Ozone
1999183106452660045122190Ozone

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.

All monitored counties in Oklahoma

Source: U.S. EPA AirData, “Annual AQI by County” files for 1999–2017 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem