Median AQI
34
Good
Florida · County air quality · 2025
Flagler County, Florida
Median AQI 34 (Good). 98.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 34
- Median AQI
- 98.1%
- Good-air days
- 0
- Unhealthy days
- 98%
- Cleaner than US counties
Flagler County's 2025 annual median AQI is 34 (Good), with 98.1% Good days
According to the U.S. EPA Air Quality System, Flagler County, Florida posted a 2025 median AQI of 34 (Good) across 364 monitored days, with 98.1% 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
- Flagler County's 98.1% Good-day share places it cleaner than 98% of US counties in 2025.
- Closest median-AQI peer
- Androscoggin County (85.2% Good, median AQI 34) is the closest nationwide median-AQI peer to Flagler County.
- 2020–2025 trend
- Flagler County's floor-qualifying Good-day share is stable from 2020 to 2025 (99.2% → 98.1%).
- Median AQI
- Median AQI: 34
The verdict
According to EPA Air Quality System monitoring data, Flagler County's air is good on balance, among the cleanest 5% of US counties, a median AQI of 34 with 98.1% of 364 monitored days in the Good band, driven mainly by Ozone.
- 34
- median AQI · Good
- 98.1%
- days rated Good
- Ozone
- main pollutant
- 98%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 77.
Data updated August 2026
- Good · 357 d · 98.1%
- Moderate · 7 d · 1.9%
How did Flagler County's air break down in 2025?
Across 364 monitored days, 357 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 77 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 364 days monitored. Median AQI: 34 (Good).
Insights: Flagler County, Florida. EPA monitors recorded a median Air Quality Index of 34 across 364 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 357 (98%) fell in the Good band (AQI 0–50), 7 (2%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 45, while the worst single-day peak hit 77 (Moderate). Residents averaged about 29.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (364 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -1.1 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 77, 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
98.1%
357 of 364 monitored days
23.1pp vs 75% target
Max AQI Recorded
77
Moderate
Health Grade
Excellent
90th-pct AQI 45
Flagler County, Good days share 98.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Flagler 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 364 monitored days across EPA AQI categories.
Good
357
98%
Moderate
7
2%
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 Flagler County.
- Ozone · 364 days · 100.0%
Health Impact Assessment
Excellent
Flagler County's air quality is rated Excellent based on 98.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 98.1% of monitored days in 2025, with a median AQI of 34. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 364 of 364 monitored days.
5-Year Air Quality Trend
Air quality is stable in Flagler County. Highest Good-day share: 2020 (99.2%, 363 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 363 | 3 | 0 | 0 | 31 | 64 |
| 2021 | 344 | 9 | 0 | 0 | 33 | 67 |
| 2022 | 352 | 9 | 0 | 0 | 34 | 100 |
| 2023 | 354 | 10 | 0 | 0 | 35 | 71 |
| 2024 | 344 | 10 | 0 | 0 | 35 | 71 |
| 2025 | 357 | 7 | 0 | 0 | 34 | 77 |
How does Flagler County compare?
How Flagler County compares
Good-day share better than US avg
Flagler County 98.1%
Androscoggin County, Maine 85.2%
US average 76.0%
Median AQI better than US avg
Flagler County 34
Androscoggin County, Maine 34
US average 39
Unhealthy days / yr better than US avg
Flagler County 0
Androscoggin County, Maine 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Flagler County (34), not geographic neighbors.
Androscoggin County, Maine
Median AQI 34 · 85.2% Good-day share
Archuleta County, Colorado
Median AQI 34 · 83.0% Good-day share
Bristol City County, Virginia
Median AQI 34 · 78.0% Good-day share
Brown County, Indiana
Median AQI 34 · 95.9% Good-day share
Clark County, Arkansas
Median AQI 34 · 96.7% Good-day share
Clay County, South Dakota
Median AQI 34 · 87.8% 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).
Elmore County, Alabama
97.9% Good-day share · median AQI 34
Prince Edward County, Virginia
97.8% Good-day share · median AQI 33
Mayagnez County, Puerto Rico
97.8% Good-day share · median AQI 9
Knox County, Maine
97.8% Good-day share · median AQI 33
Liberty County, Florida
98.5% Good-day share · median AQI 33
Fauquier County, Virginia
97.5% Good-day share · median AQI 34
Florida counties on the map
Geographic containment only, other monitored counties in Florida, independent of AQI or pollutant match.
What Flagler 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 34 means for exposure. Health guidance
- See how Flagler County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Flagler County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 364 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 Flagler County, Florida? ▼
Flagler County has a median Air Quality Index (AQI) of 34, rated "Good." 98.1% of monitored days (357 out of 364) had good air quality in 2025.
What is the main pollutant in Flagler County? ▼
The primary pollutant in Flagler County is Ozone (O3), which was the main AQI driver on 364 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Flagler County have? ▼
In 2025, Flagler County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 77.
Is the air quality in Flagler County getting better or worse? ▼
Air quality in Flagler 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 99.2% (363 of 366 days). Lowest qualifying Good-day share: 2024 at 97.2% (344 of 354 days).
What does AQI 34 mean for health? ▼
Flagler County's median AQI of 34 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Flagler County compare to other counties in Florida? ▼
Flagler County has 98.1% 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 Flagler County? ▼
The 90th percentile AQI for Flagler County is 45, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (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 Flagler 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.