EnviroNearby

Mayes County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Mayes, Oklahoma, 1989–2025.

91%
Good days in 2025
37
Median daily AQI, 2025
0
Days above 100 in 2025
285
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Mayes, Oklahoma on 285 days. 260 of those days (91%) were in the Good range, and the median daily AQI was 37. That median is lower than the typical monitored county in Oklahoma (median 44 across 19 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 285 days. Across the years with fuller monitoring, the share of Good days rose: an average of 79% in 1998–2000 versus 90% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (285 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.

Years with fewer than 120 monitored days (1992, 1993, 1994, 1995, 1996, 1997…) 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%1989: Good 25 of 25 days19891990: Good 55 of 56 days1990: Moderate 1 of 56 days1991: Good 49 of 49 days1992: Good 49 of 49 days1993: Good 36 of 38 days1993: Moderate 2 of 38 days1994: Good 49 of 50 days1994: Moderate 1 of 50 days19941995: Good 54 of 57 days1995: Moderate 3 of 57 days1996: Good 54 of 57 days1996: Moderate 3 of 57 days1997: Good 48 of 48 days1998: Good 183 of 300 days1998: Moderate 88 of 300 days1998: Unhealthy for Sensitive Groups 25 of 300 days1998: Unhealthy 3 of 300 days1998: Very Unhealthy 1 of 300 days1999: Good 330 of 349 days1999: Moderate 19 of 349 days19992000: Good 272 of 335 days2000: Moderate 63 of 335 days2001: Good 100 of 182 days2001: Moderate 82 of 182 days2002: Good 50 of 120 days2002: Moderate 70 of 120 days2003: Good 41 of 123 days2003: Moderate 81 of 123 days2003: Unhealthy for Sensitive Groups 1 of 123 days2004: Good 239 of 344 days2004: Moderate 101 of 344 days2004: Unhealthy for Sensitive Groups 4 of 344 days20042005: Good 210 of 364 days2005: Moderate 128 of 364 days2005: Unhealthy for Sensitive Groups 26 of 364 days2006: Good 216 of 365 days2006: Moderate 123 of 365 days2006: Unhealthy for Sensitive Groups 24 of 365 days2006: Unhealthy 2 of 365 days2007: Good 240 of 365 days2007: Moderate 120 of 365 days2007: Unhealthy for Sensitive Groups 5 of 365 days2008: Good 264 of 365 days2008: Moderate 100 of 365 days2008: Unhealthy for Sensitive Groups 1 of 365 days2009: Good 239 of 342 days2009: Moderate 100 of 342 days2009: Unhealthy for Sensitive Groups 3 of 342 days20092010: Good 176 of 285 days2010: Moderate 108 of 285 days2010: Unhealthy for Sensitive Groups 1 of 285 days2011: Good 154 of 266 days2011: Moderate 92 of 266 days2011: Unhealthy for Sensitive Groups 18 of 266 days2011: Unhealthy 2 of 266 days2012: Good 181 of 275 days2012: Moderate 68 of 275 days2012: Unhealthy for Sensitive Groups 23 of 275 days2012: Unhealthy 3 of 275 days2013: Good 229 of 275 days2013: Moderate 44 of 275 days2013: Unhealthy for Sensitive Groups 2 of 275 days2014: Good 262 of 286 days2014: Moderate 24 of 286 days20142015: Good 262 of 284 days2015: Moderate 21 of 284 days2015: Unhealthy for Sensitive Groups 1 of 284 days2016: Good 264 of 294 days2016: Moderate 30 of 294 days2017: Good 261 of 285 days2017: Moderate 24 of 285 days2018: Good 228 of 261 days2018: Moderate 32 of 261 days2018: Unhealthy for Sensitive Groups 1 of 261 days2019: Good 283 of 297 days2019: Moderate 14 of 297 days20192020: Good 255 of 258 days2020: Moderate 3 of 258 days2021: Good 228 of 248 days2021: Moderate 20 of 248 days2022: Good 246 of 266 days2022: Moderate 19 of 266 days2022: Unhealthy for Sensitive Groups 1 of 266 days2023: Good 255 of 285 days2023: Moderate 28 of 285 days2023: Unhealthy for Sensitive Groups 2 of 285 days2024: Good 261 of 290 days2024: Moderate 28 of 290 days2024: Unhealthy for Sensitive Groups 1 of 290 days20242025: Good 260 of 285 days2025: Moderate 25 of 285 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 year0501001989: 90th percentile AQI 401990: 90th percentile AQI 381991: 90th percentile AQI 411992: 90th percentile AQI 411993: 90th percentile AQI 391994: 90th percentile AQI 401995: 90th percentile AQI 401996: 90th percentile AQI 341997: 90th percentile AQI 331998: 90th percentile AQI 1001999: 90th percentile AQI 362000: 90th percentile AQI 592001: 90th percentile AQI 702002: 90th percentile AQI 712003: 90th percentile AQI 712004: 90th percentile AQI 672005: 90th percentile AQI 932006: 90th percentile AQI 902007: 90th percentile AQI 712008: 90th percentile AQI 652009: 90th percentile AQI 662010: 90th percentile AQI 712011: 90th percentile AQI 972012: 90th percentile AQI 1002013: 90th percentile AQI 612014: 90th percentile AQI 502015: 90th percentile AQI 502016: 90th percentile AQI 512017: 90th percentile AQI 492018: 90th percentile AQI 542019: 90th percentile AQI 462020: 90th percentile AQI 442021: 90th percentile AQI 492022: 90th percentile AQI 492023: 90th percentile AQI 512024: 90th percentile AQI 512025: 90th percentile AQI 491989: Median AQI 271990: Median AQI 251991: Median AQI 221992: Median AQI 221993: Median AQI 251994: Median AQI 231995: Median AQI 221996: Median AQI 201997: Median AQI 211998: Median AQI 441999: Median AQI 192000: Median AQI 232001: Median AQI 432002: Median AQI 542003: Median AQI 552004: Median AQI 432005: Median AQI 472006: Median AQI 452007: Median AQI 412008: Median AQI 412009: Median AQI 442010: Median AQI 452011: Median AQI 462012: Median AQI 442013: Median AQI 402014: Median AQI 372015: Median AQI 382016: Median AQI 382017: Median AQI 382018: Median AQI 372019: Median AQI 352020: Median AQI 342021: Median AQI 372022: Median AQI 392023: Median AQI 422024: Median AQI 402025: Median AQI 37198919941999200420092014201920242025
  • 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
Ozone285100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025285260250000374987Ozone
20242902612810004051112Ozone
20232852552820004251129Ozone
20222662461910003949112Ozone
20212482282000003749100Ozone
202025825530000344451Ozone
20192972831400003546100Ozone
20182612283210003754140Ozone
2017285261240000384971Ozone
2016294264300000385193Ozone
20152842622110003850108Ozone
2014286262240000375074Ozone
20132752294420004061112Ozone
2012275181682330044100166Ozone
201126615492182004697166Ozone
201028517610810004571101Ozone
200934223910030004466115Ozone
200836526410010004165112Ozone
200736524012050004171136Ozone
2006365216123242004590174Ozone
2005364210128260004793150Ozone
200434423910140004367129Ozone
2003123418110005571106PM2.5
200212050700000547199PM2.5
2001182100820000437091PM2.5
2000335272630000235994NO2
1999349330190000193676NO2
1998300183882531044100212Ozone
1997484800000213345PM10
1996575430000203453PM10
1995575430000224052PM10
1994504910000234052PM10
1993383620000253954PM10
1992494900000224145PM10
1991494900000224150PM10
1990565510000253853PM10
1989252500000274042PM10

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 1989–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem