Median AQI
35
Good
Florida · County air quality · 2025
Lake County, Florida
Median AQI 35 (Good). 95.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 35
- Median AQI
- 95.0%
- Good-air days
- 0
- Unhealthy days
- 92%
- Cleaner than US counties
Lake County's 2025 annual median AQI is 35 (Good), with 95.0% Good days
According to the U.S. EPA Air Quality System, Lake County, Florida posted a 2025 median AQI of 35 (Good) across 360 monitored days, with 95.0% 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
- Lake County's 95.0% Good-day share places it cleaner than 92% of US counties in 2025.
- Closest median-AQI peer
- Atascosa County (76.0% Good, median AQI 35) is the closest nationwide median-AQI peer to Lake County.
- 2020–2025 trend
- Lake County's floor-qualifying Good-day share is stable from 2020 to 2025 (96.7% → 95.0%).
- Median AQI
- Median AQI: 35
The verdict
According to EPA Air Quality System monitoring data, Lake County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 35 with 95.0% of 360 monitored days in the Good band, driven mainly by Ozone.
- 35
- median AQI · Good
- 95.0%
- days rated Good
- Ozone
- main pollutant
- 92%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 112.
Annual release change
What changed in the 2025 EPA annual release
- Lake County's Good-day share rose from 90.7% to 95.0% between the 2024 and 2025 EPA annual releases, a change of +4.3 percentage points.
- Lake County's peak single-day AQI rose from 100 to 112 between the 2024 and 2025 EPA annual releases, a change of +12 points.
Data updated August 2026
- Good · 342 d · 95.0%
- Moderate · 17 d · 4.7%
- USG · 1 d · 0.3%
How did Lake County's air break down in 2025?
Across 360 monitored days, 342 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 112 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 360 days monitored. Median AQI: 35 (Good).
Insights: Lake County, Florida. EPA monitors recorded a median Air Quality Index of 35 across 360 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 342 (95%) fell in the Good band (AQI 0–50), 17 (5%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 47, while the worst single-day peak hit 112 (USG). Residents averaged about 28.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (360 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -1.7 points and the median AQI moved +3 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 112, 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
95.0%
342 of 360 monitored days
20.0pp vs 75% target
Max AQI Recorded
112
USG
Health Grade
Excellent
90th-pct AQI 47
Lake County, Good days share 95.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lake 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 360 monitored days across EPA AQI categories.
Good
342
95%
Moderate
17
5%
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 Lake County.
- Ozone · 360 days · 100.0%
Health Impact Assessment
Excellent
Lake County's air quality is rated Excellent based on 95.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 95.0% of monitored days in 2025, with a median AQI of 35. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 360 of 360 monitored days.
5-Year Air Quality Trend
Air quality is stable in Lake County. Highest Good-day share: 2020 (96.7%, 354 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 354 | 12 | 0 | 0 | 32 | 87 |
| 2021 | 338 | 18 | 0 | 0 | 34 | 87 |
| 2022 | 349 | 15 | 0 | 0 | 35 | 87 |
| 2023 | 337 | 27 | 0 | 0 | 37 | 97 |
| 2024 | 312 | 32 | 0 | 0 | 36 | 100 |
| 2025 | 342 | 17 | 1 | 0 | 35 | 112 |
How does Lake County compare?
How Lake County compares
Good-day share better than US avg
Lake County 95.0%
Atascosa County, Texas 76.0%
US average 76.0%
Median AQI better than US avg
Lake County 35
Atascosa County, Texas 35
US average 39
Unhealthy days / yr better than US avg
Lake County 0
Atascosa County, Texas 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Lake County (35), not geographic neighbors.
Atascosa County, Texas
Median AQI 35 · 76.0% Good-day share
Benzie County, Michigan
Median AQI 35 · 91.1% Good-day share
Berkeley County, South Carolina
Median AQI 35 · 93.3% Good-day share
Boone County, Indiana
Median AQI 35 · 89.7% Good-day share
Brazoria County, Texas
Median AQI 35 · 80.8% Good-day share
Caroline County, Virginia
Median AQI 35 · 96.7% 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).
Lee County, Mississippi
95.0% Good-day share · median AQI 38
Highlands County, Florida
94.9% Good-day share · median AQI 35
Rockingham County, North Carolina
95.1% Good-day share · median AQI 38
Dawson County, Georgia
95.1% Good-day share · median AQI 34
Washington County, Minnesota
94.9% Good-day share · median AQI 34
Caswell County, North Carolina
95.1% Good-day share · median AQI 37
Florida counties on the map
Geographic containment only, other monitored counties in Florida, independent of AQI or pollutant match.
What Lake 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 35 means for exposure. Health guidance
- See how Lake County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Lake County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 360 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 Lake County, Florida? ▼
Lake County has a median Air Quality Index (AQI) of 35, rated "Good." 95.0% of monitored days (342 out of 360) had good air quality in 2025.
What is the main pollutant in Lake County? ▼
The primary pollutant in Lake County is Ozone (O3), which was the main AQI driver on 360 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Lake County have? ▼
In 2025, Lake County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 112.
Is the air quality in Lake County getting better or worse? ▼
Air quality in Lake 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: 2020 at 96.7% (354 of 366 days). Lowest qualifying Good-day share: 2024 at 90.7% (312 of 344 days).
What does AQI 35 mean for health? ▼
Lake County's median AQI of 35 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Lake County compare to other counties in Florida? ▼
Lake County has 95.0% 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 Lake County? ▼
The 90th percentile AQI for Lake County is 47, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 112 (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 Lake County, Florida · 2020–2025
Share this annual record
Send the source-year summary or download its ready-to-use data card.
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
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.