Median AQI
40
Good
Florida · County air quality · 2025
Lee County, Florida
Median AQI 40 (Good). 76.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 40
- Median AQI
- 76.4%
- Good-air days
- 0
- Unhealthy days
- 47%
- Cleaner than US counties
Lee County's 2025 annual median AQI is 40 (Good), with 76.4% Good days
According to the U.S. EPA Air Quality System, Lee County, Florida posted a 2025 median AQI of 40 (Good) across 365 monitored days, with 76.4% 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
- Lee County's 76.4% Good-day share places it cleaner than 47% of US counties in 2025.
- Closest median-AQI peer
- Anderson County (91.3% Good, median AQI 40) is the closest nationwide median-AQI peer to Lee County.
- 2020–2025 trend
- Lee County's floor-qualifying Good-day share is stable from 2020 to 2025 (77.6% → 76.4%).
- Median AQI
- Median AQI: 40
The verdict
According to EPA Air Quality System monitoring data, Lee County's air is good on balance, more polluted than the median US county, a median AQI of 40 with 76.4% of 365 monitored days in the Good band, driven mainly by Ozone.
- 40
- median AQI · Good
- 76.4%
- days rated Good
- Ozone
- main pollutant
- 47%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 97.
Annual release change
What changed in the 2025 EPA annual release
- Lee County's Good-day share fell from 92.1% to 76.4% between the 2024 and 2025 EPA annual releases, a change of -15.6 percentage points.
- Lee County's peak single-day AQI rose from 80 to 97 between the 2024 and 2025 EPA annual releases, a change of +17 points.
- Lee County's median AQI rose from 37 to 40 between the 2024 and 2025 EPA annual releases, a change of +3 points.
Data updated August 2026
- Good · 279 d · 76.4%
- Moderate · 86 d · 23.6%
How did Lee County's air break down in 2025?
Across 365 monitored days, 279 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 97 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 40 (Good).
Insights: Lee County, Florida. EPA monitors recorded a median Air Quality Index of 40 across 365 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 279 (76%) fell in the Good band (AQI 0–50), 86 (24%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 56, while the worst single-day peak hit 97 (Moderate). Residents averaged about 22.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (207 days), PM2.5 (158 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -1.2 points and the median AQI moved +1 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 97, moderate 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
76.4%
279 of 365 monitored days
1.4pp vs 75% target
Max AQI Recorded
97
Moderate
Health Grade
Good
90th-pct AQI 56
Lee County, Good days share 76.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lee 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
279
76%
Moderate
86
24%
USG
0
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 Lee County.
- Ozone · 207 days · 56.7%
- PM2.5 · 158 days · 43.3%
Health Impact Assessment
Good
Lee County's air quality is rated Good based on 76.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 76.4% of monitored days in 2025, with a median AQI of 40. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 207 of 365 monitored days.
5-Year Air Quality Trend
Air quality is stable in Lee County. Highest Good-day share: 2023 (94.5%, 343 of 363 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 284 | 82 | 0 | 0 | 39 | 100 |
| 2021 | 299 | 66 | 0 | 0 | 41 | 97 |
| 2022 | 238 | 64 | 0 | 0 | 42 | 80 |
| 2023 | 343 | 19 | 1 | 0 | 35 | 101 |
| 2024 | 313 | 27 | 0 | 0 | 37 | 80 |
| 2025 | 279 | 86 | 0 | 0 | 40 | 97 |
How does Lee County compare?
How Lee County compares
Good-day share about average
Lee County 76.4%
Anderson County, South Carolina 91.3%
US average 76.0%
Median AQI worse than US avg
Lee County 40
Anderson County, South Carolina 40
US average 39
Unhealthy days / yr better than US avg
Lee County 0
Anderson County, South Carolina 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Lee County (40), not geographic neighbors.
Anderson County, South Carolina
Median AQI 40 · 91.3% Good-day share
Andrew County, Missouri
Median AQI 40 · 86.9% Good-day share
Anne Arundel County, Maryland
Median AQI 40 · 87.6% Good-day share
Bergen County, New Jersey
Median AQI 40 · 71.1% Good-day share
Blair County, Pennsylvania
Median AQI 40 · 76.9% Good-day share
Brazos County, Texas
Median AQI 40 · 68.5% Good-day share
Same primary pollutant: Ozone
Ozone 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).
York County, South Carolina
76.5% Good-day share · median AQI 43
La Paz County, Arizona
76.6% Good-day share · median AQI 44
Cumberland County, New Jersey
76.2% Good-day share · median AQI 40
Cass County, North Dakota
76.2% Good-day share · median AQI 37
Burke County, North Dakota
76.2% Good-day share · median AQI 38
Franklin County, Massachusetts
76.9% Good-day share · median AQI 38
Florida counties on the map
Geographic containment only, other monitored counties in Florida, independent of AQI or pollutant match.
What Lee County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 40 means for exposure. Health guidance
- See how Lee County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Lee 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 Lee County, Florida? ▼
Lee County has a median Air Quality Index (AQI) of 40, rated "Good." 76.4% of monitored days (279 out of 365) had good air quality in 2025.
What is the main pollutant in Lee County? ▼
The primary pollutant in Lee County is Ozone (O3), which was the main AQI driver on 207 days (57% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Lee County have? ▼
In 2025, Lee County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 97.
Is the air quality in Lee County getting better or worse? ▼
Air quality in Lee County is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2023 at 94.5% (343 of 363 days). Lowest qualifying Good-day share: 2025 at 76.4% (279 of 365 days).
What does AQI 40 mean for health? ▼
Lee County's median AQI of 40 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Lee County compare to other counties in Florida? ▼
Lee County has 76.4% 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 Lee County? ▼
The 90th percentile AQI for Lee County is 56, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 97 (Moderate).
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 Lee 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.