EnviroNearby

Latimer County, Oklahoma air quality history

Daily Air Quality Index summaries from EPA monitors in Latimer, Oklahoma, 1997–2001.

98%
Good days in 2001
23
Median daily AQI, 2001
0
Days above 100 in 2001
291
Days with an AQI in 2001 (of 365)

In 2001, EPA reported a daily Air Quality Index (AQI) for Latimer, Oklahoma on 291 days. 284 of those days (98%) were in the Good range, and the median daily AQI was 23. That median is lower than the typical monitored county in Oklahoma (median 44 across 15 counties), and lower than the typical monitored U.S. county (44). The main pollutant was ozone on 263 days.

EPA did not report an AQI for every day of 2001 here (291 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 2001; EPA's files for 2002–2025 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%1997: Good 106 of 144 days1997: Moderate 23 of 144 days1997: Unhealthy for Sensitive Groups 12 of 144 days1997: Unhealthy 3 of 144 days19971998: Good 194 of 331 days1998: Moderate 111 of 331 days1998: Unhealthy for Sensitive Groups 21 of 331 days1998: Unhealthy 5 of 331 days19981999: Good 331 of 353 days1999: Moderate 19 of 353 days1999: Unhealthy for Sensitive Groups 3 of 353 days19992000: Good 323 of 342 days2000: Moderate 18 of 342 days2000: Unhealthy for Sensitive Groups 1 of 342 days20002001: Good 284 of 291 days2001: Moderate 7 of 291 days2001
  • 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 year0501001501997: 90th percentile AQI 1011998: 90th percentile AQI 1001999: 90th percentile AQI 462000: 90th percentile AQI 472001: 90th percentile AQI 401997: Median AQI 431998: Median AQI 451999: Median AQI 302000: Median AQI 272001: Median AQI 2319971998199920002001
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2001

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
Ozone26390%
Nitrogen dioxide (NO₂)2810%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
200129128470000234090Ozone
20003423231810002747101Ozone
19993533311930003046119Ozone
19983311941112150045100190Ozone
1997144106231230043101166Ozone

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 1997–2001 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem