Median AQI
34
Good
Florida · County air quality · 2025
Flagler County, Florida
Median AQI 34 (Good). 97.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 34
- Median AQI
- 97.4%
- Good-air days
- 0
- Unhealthy days
- 94%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Flagler County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 34 with 97.4% of 272 monitored days in the Good band, driven mainly by Ozone.
- 34
- median AQI · Good
- 97.4%
- days rated Good
- Ozone
- main pollutant
- 94%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 77.
Data updated July 2026
- Good · 265 d · 97.4%
- Moderate · 7 d · 2.6%
How did Flagler County's air break down in 2025?
Across 272 monitored days, 265 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). 272 days monitored. Median AQI: 34 (Good).
Insights: Flagler County, Florida. EPA monitors recorded a median Air Quality Index of 34 across 272 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 265 (97%) fell in the Good band (AQI 0–50), 7 (3%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 46, while the worst single-day peak hit 77 (Moderate). Residents averaged about 29.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (272 days). Across the 2020–2025 trend window, good days shifted by -98 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 (90.1% good, AQI 37); Baker (69.1% good, AQI 45); Bay (60.6% good, AQI 46); Brevard (89.7% good, AQI 37); Broward (72.4% good, AQI 43); Citrus (67.8% good, AQI 44).
Air Quality Summary
Good Days
97.4%
265 of 272 monitored days
22.4pp vs 75% target
Max AQI Recorded
77
Moderate
Health Grade
Excellent
90th-pct AQI 46
Flagler County, Good days share 97.4%
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 272 monitored days across EPA AQI categories.
Good
265
97%
Moderate
7
3%
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 · 272 days · 100.0%
Health Impact Assessment
Excellent
Flagler County's air quality is rated Excellent based on 97.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 97.4% 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 272 of 272 monitored days.
5-Year Air Quality Trend
Air quality is stable in Flagler County. Best year: 2020 (363 good 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 | 265 | 7 | 0 | 0 | 34 | 77 |
How does Flagler County compare?
How Flagler County compares
Good-day share better than US avg
Flagler County 97.4%
Alachua County, Florida 90.1%
US average 76.5%
Median AQI better than US avg
Flagler County 34
Alachua County, Florida 37
US average 38
Unhealthy days / yr about average
Flagler County 0
Alachua County, Florida 0
US average 0
Other Counties in Florida
Air quality comparison for nearby counties in Florida.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Flagler County.
Belknap County, New Hampshire
AQI 34 · 87.9% good
Dyer County, Tennessee
AQI 34 · 79.4% good
Grant County, Oregon
AQI 34 · 66.7% good
Highlands County, Florida
AQI 34 · 93.2% good
Johnson County, Texas
AQI 34 · 91.6% good
Knox County, Maine
AQI 34 · 97.3% good
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 272 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
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." 97.4% of monitored days (265 out of 272) 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 272 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 based on 5-year trends (2020-2025). Best year: 2020 with 363 good days. Worst year: 2025 with 265 good days.
What does AQI 34 mean for health? ▼
Flagler County's median AQI of 34 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Flagler County compare to other counties in Florida? ▼
Flagler County has 97.4% good air days. Nearby counties in Florida: Alachua (90.1% good), Baker (69.1% good), Bay (60.6% good), Brevard (89.7% good), Broward (72.4% good), Citrus (67.8% good).
What is the 90th percentile AQI in Flagler County? ▼
The 90th percentile AQI for Flagler County is 46, 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.
Every figure on PlainAir 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.