EnviroNearby

Caddo County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Caddo, Oklahoma, 2000–2017.

98%
Good days in 2016
33
Median daily AQI, 2016
0
Days above 100 in 2016
137
Days with an AQI in 2016 (of 366)

In 2016, EPA reported a daily Air Quality Index (AQI) for Caddo, Oklahoma on 137 days. 134 of those days (98%) were in the Good range, and the median daily AQI was 33. That median is lower than the typical monitored county in Oklahoma (median 39 across 25 counties), and lower than the typical monitored U.S. county (41). The main pollutant was ozone on 137 days. Across the years with fuller monitoring, the share of Good days rose: an average of 77% in 2006–2008 versus 98% in 2014–2016.

EPA did not report an AQI for every day of 2016 here (137 of 366 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.

Years with fewer than 120 monitored days (2001, 2002, 2003, 2004, 2005, 2017…) 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%2000: Good 23 of 40 days2000: Moderate 17 of 40 days20002001: Good 35 of 57 days2001: Moderate 22 of 57 days2002: Good 36 of 56 days2002: Moderate 20 of 56 days20022003: Good 29 of 54 days2003: Moderate 25 of 54 days2004: Good 33 of 58 days2004: Moderate 25 of 58 days20042005: Good 26 of 61 days2005: Moderate 34 of 61 days2005: Unhealthy for Sensitive Groups 1 of 61 days2006: Good 173 of 254 days2006: Moderate 61 of 254 days2006: Unhealthy for Sensitive Groups 20 of 254 days20062007: Good 150 of 170 days2007: Moderate 20 of 170 days2008: Good 183 of 241 days2008: Moderate 58 of 241 days20082009: Good 267 of 329 days2009: Moderate 62 of 329 days2010: Good 277 of 348 days2010: Moderate 70 of 348 days2010: Unhealthy for Sensitive Groups 1 of 348 days20102011: Good 234 of 349 days2011: Moderate 96 of 349 days2011: Unhealthy for Sensitive Groups 17 of 349 days2011: Unhealthy 2 of 349 days2012: Good 259 of 339 days2012: Moderate 66 of 339 days2012: Unhealthy for Sensitive Groups 14 of 339 days20122013: Good 326 of 343 days2013: Moderate 17 of 343 days2014: Good 305 of 309 days2014: Moderate 4 of 309 days20142015: Good 257 of 266 days2015: Moderate 9 of 266 days2016: Good 134 of 137 days2016: Moderate 3 of 137 days20162017: Good 107 of 111 days2017: Moderate 4 of 111 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 year0501002000: 90th percentile AQI 682001: 90th percentile AQI 652002: 90th percentile AQI 632003: 90th percentile AQI 682004: 90th percentile AQI 682005: 90th percentile AQI 722006: 90th percentile AQI 902007: 90th percentile AQI 542008: 90th percentile AQI 672009: 90th percentile AQI 632010: 90th percentile AQI 672011: 90th percentile AQI 872012: 90th percentile AQI 802013: 90th percentile AQI 442014: 90th percentile AQI 422015: 90th percentile AQI 462016: 90th percentile AQI 442017: 90th percentile AQI 452000: Median AQI 502001: Median AQI 432002: Median AQI 382003: Median AQI 472004: Median AQI 472005: Median AQI 522006: Median AQI 422007: Median AQI 232008: Median AQI 412009: Median AQI 372010: Median AQI 402011: Median AQI 442012: Median AQI 402013: Median AQI 282014: Median AQI 242015: Median AQI 312016: Median AQI 332017: Median AQI 352000200220042006200820102012201420162017
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2016

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
Ozone137100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
201711110740000354558Ozone
201613713430000334461Ozone
201526625790000314674Ozone
201430930540000244274Ozone
2013343326170000284497Ozone
201233925966140004080133Ozone
201134923496172004487161Ozone
20103482777010004067126Ozone
20093292676200003763100Ozone
20082411835800004167100Ozone
2007170150200000235496Ozone
200625417361200004290147Ozone
200561263410005272123PM2.5
20045833250000476894PM2.5
20035429250000476881PM2.5
20025636200000386385PM2.5
20015735220000436585PM2.5
20004023170000506874PM2.5

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 2016

All monitored counties in Oklahoma

Source: U.S. EPA AirData, “Annual AQI by County” files for 2000–2017 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem