Oklahoma · County air quality · 2024

Jefferson County, Oklahoma

Median AQI 42 (Good). 81.0% of monitored days rated Good, direct from EPA Air Quality System stations.

42
Median AQI
81.0%
Good-air days
0
Unhealthy days
47%
Cleaner than US counties

Jefferson County's 2024 annual median AQI is 42 (Good), with 81.0% Good days

According to the U.S. EPA Air Quality System, Jefferson County, Oklahoma posted a 2024 median AQI of 42 (Good) across 305 monitored days, with 81.0% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US
Jefferson County's 81.0% Good-day share places it cleaner than 47% of US counties in 2024.
Closest median-AQI peer
Pontotoc County (71.6% Good, median AQI 43) is the closest nationwide median-AQI peer to Jefferson County.
2023–2024 trend
Jefferson County's floor-qualifying Good-day share is improving from 2023 to 2024 (65.8% → 81.0%).
Median AQI
Median AQI: 42

According to the 2024 EPA AQS county release on PlainAirData, Jefferson County, Oklahoma ranks #8 of 15 by median AQI (42) and #8 by good-day share (81.0%). San Mateo County, California is #1 of 15 by median AQI (27, 88.1% Good days) at good-day-share #5 ≠ Chattooga County, Georgia #1 by good-day share (96.3%, median AQI 39) at median-AQI #5.

Annual release change

What changed in the 2024 EPA annual release

2023 → 2024
  • Jefferson County's Good-day share rose from 65.8% to 81.0% between the 2023 and 2024 EPA annual releases, a change of +15.2 percentage points.
  • Jefferson County's peak single-day AQI fell from 133 to 108 between the 2023 and 2024 EPA annual releases, a change of -25 points.
  • Jefferson County's median AQI fell from 46 to 42 between the 2023 and 2024 EPA annual releases, a change of -4 points.

Compared against 231 monitored days in 2023 and 305 in 2024. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Data updated August 2026

Jefferson County AQI category distribution Stacked-segment bar showing the share of monitored days that fell in each EPA AQI category, Good, Moderate, USG, Unhealthy, Very Unhealthy, Hazardous, with median AQI marker. AQI category distribution 305 monitored days G M Median AQI 42 0 50 100 150 200 300 500 Jefferson County
  • Good · 247 d · 81.0%
  • Moderate · 55 d · 18.0%
  • USG · 3 d · 1.0%

How did Jefferson County's air break down in 2024?

Across 305 monitored days, 247 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).

EPA AQS →
Jefferson County, Good days share 81.0%
National avg

Share of monitored days at AQI 0-50 (Good band).

Jefferson County, Unhealthy-or-worse share 0.0%
National avg

Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).

Where Jefferson County sits nationally

COUNT-derived placement among 951 US counties with at least 100 monitored days in 2024. Jefferson County's Good-day share is 81.0% - cleaner than 47% of that comparison set.

Jefferson County Good-day share vs. every US county

Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release

81.0% 47th percentile higher than 47% of 951 US counties

0.0%–5.0%: 0 US counties (0%). Below this entry. 5.0%–10.0%: 1 US counties (0%). Below this entry. 10.0%–15.0%: 4 US counties (0%). Below this entry. 15.0%–20.0%: 4 US counties (0%). Below this entry. 20.0%–25.0%: 1 US counties (0%). Below this entry. 25.0%–30.0%: 5 US counties (1%). Below this entry. 30.0%–35.0%: 9 US counties (1%). Below this entry. 35.0%–40.0%: 4 US counties (0%). Below this entry. 40.0%–45.0%: 16 US counties (2%). Below this entry. 45.0%–50.0%: 16 US counties (2%). Below this entry. 50.0%–55.0%: 32 US counties (3%). Below this entry. 55.0%–60.0%: 50 US counties (5%). Below this entry. 60.0%–65.0%: 77 US counties (8%). Below this entry. 65.0%–70.0%: 93 US counties (10%). Below this entry. 70.0%–75.0%: 109 US counties (11%). Below this entry. 75.0%–80.0%: 114 US counties (12%). Below this entry. 80.0%–85.0%: 123 US counties (13%). This entry sits in this band. 85.0%–90.0%: 99 US counties (10%). Above this entry. 90.0%–95.0%: 117 US counties (12%). Above this entry. 95.0%–100.0%: 70 US counties (7%). Above this entry. 100.0%–105.0%: 7 US counties (1%). Above this entry. This county 0.0% 100% every floor-qualified US county, bucketed by value

Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2024

Pollutant Breakdown

Days where each pollutant was the primary driver of AQI readings in Jefferson County.

Jefferson County, Oklahoma criteria pollutant distribution Stratified-band visualization showing the share of monitored days each criteria pollutant (PM2.5, PM10, O3, NO2, CO) was the primary AQI driver. Ozone · 100.0% 0% 25% 50% 75% 100% Jefferson County, Oklahoma · 305 monitored days Criteria pollutant column
  • Ozone · 305 days · 100.0%

2024 daily-monitor rhythm in Jefferson County

Month-by-month median AQI from EPA day-level county monitors (305 reported days in 2024). Aug posted the highest typical readings (median AQI 51, peak 108); Dec was cleanest at median 32. Summer months (Jun–Aug) averaged median AQI 46 vs 34 in Dec–Feb.

0 10 20 30 40 50 60 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 36 39 42 45 41 46 51 43 48 33 32
Jefferson County median daily AQI by calendar month (2024, EPA daily county file)

Health Impact Assessment

Good

Jefferson County's air quality is rated Good based on 81.0% good air days. No unhealthy air days were recorded in 2024.

Air quality was acceptable on 81.0% of monitored days in 2024, with a median AQI of 42. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.

The dominant pollutant is Ozone, driving AQI on 305 of 305 monitored days.

5-Year Air Quality Trend

Air quality is improving in Jefferson County. Highest Good-day share: 2024 (81.0%, 247 of 305 monitored days).

Year Good Moderate USG Unhealthy Median AQI
2023 152 74 5 0 46
2024 247 55 3 0 42

How does Jefferson County compare?

How Jefferson County compares

Good-day share better than typical
Jefferson County 81.0%
Pontotoc County, Oklahoma 71.6%
Typical US county 76.0%
Median AQI worse than typical
Jefferson County 42
Pontotoc County, Oklahoma 43
Typical US county 39
Unhealthy days / yr better than typical
Jefferson County 0
Pontotoc County, Oklahoma 0
Typical US county 1

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.

Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Jefferson County, Oklahoma · 2020–2025

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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.