Median AQI
48
Good
Florida · County air quality · 2025
Leon County, Florida
Median AQI 48 (Good). 56.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 48
- Median AQI
- 56.4%
- Good-air days
- 0
- Unhealthy days
- 11%
- Cleaner than US counties
Leon County's 2025 annual median AQI is 48 (Good), with 56.4% Good days
According to the U.S. EPA Air Quality System, Leon County, Florida posted a 2025 median AQI of 48 (Good) across 365 monitored days, with 56.4% 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
- Leon County's 56.4% Good-day share places it cleaner than 11% of US counties in 2025.
- Closest median-AQI peer
- Adair County (55.8% Good, median AQI 48) is the closest nationwide median-AQI peer to Leon County.
- 2020–2025 trend
- Leon County's floor-qualifying Good-day share is improving from 2020 to 2025 (50.5% → 56.4%).
- Median AQI
- Median AQI: 48
The verdict
According to EPA Air Quality System monitoring data, Leon County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 48 with 56.4% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 48
- median AQI · Good
- 56.4%
- days rated Good
- PM2.5
- main pollutant
- 11%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 140.
Annual release change
What changed in the 2025 EPA annual release
- Leon County's Good-day share fell from 68.5% to 56.4% between the 2024 and 2025 EPA annual releases, a change of -12.0 percentage points.
- Leon County's median AQI rose from 44 to 48 between the 2024 and 2025 EPA annual releases, a change of +4 points.
- Leon County's peak single-day AQI rose from 129 to 140 between the 2024 and 2025 EPA annual releases, a change of +11 points.
Data updated August 2026
- Good · 206 d · 56.4%
- Moderate · 158 d · 43.3%
- USG · 1 d · 0.3%
How did Leon County's air break down in 2025?
Across 365 monitored days, 206 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 140 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 48 (Good).
Insights: Leon County, Florida. EPA monitors recorded a median Air Quality Index of 48 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 206 (56%) fell in the Good band (AQI 0–50), 158 (43%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 60, while the worst single-day peak hit 140 (USG). Residents averaged about 16.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (292 days), Ozone (73 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +5.9 points and the median AQI moved -1 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 140, usg but never Unhealthy. Nearby counties show comparable readings: Alachua (88.7% good, AQI 37); Baker (69.5% good, AQI 44); Bay (66.4% good, AQI 44); Brevard (91.2% good, AQI 38); Broward (73.4% good, AQI 43); Citrus (71.1% good, AQI 43).
Air Quality Summary
Good Days
56.4%
206 of 365 monitored days
-18.6pp vs 75% target
Max AQI Recorded
140
USG
Health Grade
Moderate
90th-pct AQI 60
Leon County, Good days share 56.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Leon 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).
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
206
56%
Moderate
158
43%
USG
1
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Leon County.
- PM2.5 · 292 days · 80.0%
- Ozone · 73 days · 20.0%
Health Impact Assessment
Moderate
Leon County's air quality is rated Moderate based on 56.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 56.4% of monitored days in 2025, with a median AQI of 48. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 292 of 365 monitored days.
5-Year Air Quality Trend
Air quality is improving in Leon County. Highest Good-day share: 2024 (68.5%, 243 of 355 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 185 | 178 | 2 | 1 | 49 | 163 |
| 2021 | 194 | 171 | 0 | 0 | 48 | 80 |
| 2022 | 211 | 153 | 0 | 0 | 47 | 93 |
| 2023 | 204 | 156 | 1 | 0 | 47 | 124 |
| 2024 | 243 | 111 | 1 | 0 | 44 | 129 |
| 2025 | 206 | 158 | 1 | 0 | 48 | 140 |
How does Leon County compare?
How Leon County compares
Good-day share worse than typical
Leon County 56.4%
Adair County, Oklahoma 55.8%
Typical US county 76.0%
Median AQI worse than typical
Leon County 48
Adair County, Oklahoma 48
Typical US county 39
Unhealthy days / yr better than typical
Leon County 0
Adair County, Oklahoma 2
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Leon County (48), not geographic neighbors.
Adair County, Oklahoma
Median AQI 48 · 55.8% Good-day share
Arapahoe County, Colorado
Median AQI 48 · 58.1% Good-day share
Arkansas County, Arkansas
Median AQI 48 · 52.9% Good-day share
Ashley County, Arkansas
Median AQI 48 · 55.7% Good-day share
Boulder County, Colorado
Median AQI 48 · 58.4% Good-day share
Bowie County, Texas
Median AQI 48 · 55.0% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Buchanan County, Missouri
56.4% Good-day share · median AQI 46
Fairbanks North Star County, Alaska
56.4% Good-day share · median AQI 44
Lane County, Oregon
56.4% Good-day share · median AQI 46
Miami-Dade County, Florida
56.4% Good-day share · median AQI 47
Okanogan County, Washington
56.5% Good-day share · median AQI 41
Shoshone County, Idaho
56.2% Good-day share · median AQI 44
Florida counties on the map
Geographic containment only, other monitored counties in Florida, independent of AQI or pollutant match.
What Leon County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 48 means for exposure. Health guidance
- See how Leon County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Leon County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 365 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Leon County, Florida? ▼
Leon County has a median Air Quality Index (AQI) of 48, rated "Good." 56.4% of monitored days (206 out of 365) had good air quality in 2025.
What is the main pollutant in Leon County? ▼
The primary pollutant in Leon County is Fine Particles (PM2.5), which was the main AQI driver on 292 days (80% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Leon County have? ▼
In 2025, Leon County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 140.
Is the air quality in Leon County getting better or worse? ▼
Air quality in Leon County is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 68.5% (243 of 355 days). Lowest qualifying Good-day share: 2020 at 50.5% (185 of 366 days).
What does AQI 48 mean for health? ▼
Leon County's median AQI of 48 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Leon County compare to other counties in Florida? ▼
Leon County has 56.4% good air days. Nearby counties in Florida: Alachua (88.7% good), Baker (69.5% good), Bay (66.4% good), Brevard (91.2% good), Broward (73.4% good), Citrus (71.1% good).
What is the 90th percentile AQI in Leon County? ▼
The 90th percentile AQI for Leon County is 60, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 140 (USG).
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 Leon County, Florida · 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.