EnviroNearby

McCurtain County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in McCurtain, Oklahoma, 2010–2012.

83%
Good days in 2012
40
Median daily AQI, 2012
3
Days above 100 in 2012
328
Days with an AQI in 2012 (of 366)

In 2012, EPA reported a daily Air Quality Index (AQI) for McCurtain, Oklahoma on 328 days. 272 of those days (83%) were in the Good range, and the median daily AQI was 40. That median is lower than the typical monitored county in Oklahoma (median 44 across 21 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 328 days.

The most recent year with data for this county is 2012; EPA's files for 2013–2025 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%2010: Good 220 of 256 days2010: Moderate 35 of 256 days2010: Unhealthy for Sensitive Groups 1 of 256 days20102011: Good 213 of 273 days2011: Moderate 57 of 273 days2011: Unhealthy for Sensitive Groups 3 of 273 days20112012: Good 272 of 328 days2012: Moderate 53 of 328 days2012: Unhealthy for Sensitive Groups 3 of 328 days2012
  • 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 year0501002010: 90th percentile AQI 612011: 90th percentile AQI 712012: 90th percentile AQI 612010: Median AQI 382011: Median AQI 422012: Median AQI 40201020112012
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2012

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
Ozone328100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20123282725330004061112Ozone
20112732135730004271119Ozone
20102562203510003861101Ozone

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 2010–2012 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem