Median AQI
52
Moderate
Florida · County air quality · 2025
Duval County, Florida
Median AQI 52 (Moderate). 40.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 52
- Median AQI
- 40.7%
- Good-air days
- 0
- Unhealthy days
- 3%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Duval County's air is moderate on balance, among the most polluted counties nationally, a median AQI of 52 with 40.7% of 182 monitored days in the Good band, driven mainly by PM2.5.
- 52
- median AQI · Moderate
- 40.7%
- days rated Good
- PM2.5
- main pollutant
- 3%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 136.
Data updated July 2026
- Good · 74 d · 40.7%
- Moderate · 104 d · 57.1%
- USG · 4 d · 2.2%
How did Duval County's air break down in 2025?
Across 182 monitored days, 74 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 136 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 182 days monitored. Median AQI: 52 (Moderate).
Insights: Duval County, Florida. EPA monitors recorded a median Air Quality Index of 52 across 182 measured days in 2025, earning a Moderate classification and a Poor health grade. Of those days, 74 (41%) fell in the Good band (AQI 0–50), 104 (57%) registered Moderate readings, and 4 (2%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 64, while the worst single-day peak hit 136 (USG). Residents averaged about 12.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (134 days), Ozone (45 days), NO2 (2 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -88 and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 136, usg 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
40.7%
74 of 182 monitored days
-34.3pp vs 75% target
Max AQI Recorded
136
USG
Health Grade
Poor
90th-pct AQI 64
Duval County, Good days share 40.7%
National avg
Share of monitored days at AQI 0-50 (Good band).
Duval 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 182 monitored days across EPA AQI categories.
Good
74
41%
Moderate
104
57%
USG
4
2%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Duval County.
- PM2.5 · 134 days · 73.6%
- Ozone · 45 days · 24.7%
- NO₂ · 2 days · 1.1%
- CO · 1 days · 0.5%
Health Impact Assessment
Poor
Duval County's air quality is rated Poor based on 40.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 40.7% of monitored days in 2025, with a median AQI of 52. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 134 of 182 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Duval County. Best year: 2024 (190 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 162 | 201 | 3 | 0 | 52 | 125 |
| 2021 | 140 | 225 | 0 | 0 | 52 | 94 |
| 2022 | 144 | 221 | 0 | 0 | 53 | 93 |
| 2023 | 156 | 207 | 2 | 0 | 52 | 124 |
| 2024 | 190 | 176 | 0 | 0 | 50 | 98 |
| 2025 | 74 | 104 | 4 | 0 | 52 | 136 |
How does Duval County compare?
How Duval County compares
Good-day share worse than US avg
Duval County 40.7%
Alachua County, Florida 90.1%
US average 76.5%
Median AQI worse than US avg
Duval County 52
Alachua County, Florida 37
US average 38
Unhealthy days / yr about average
Duval 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 Duval County.
Hinds County, Mississippi
AQI 52 · 43.4% good
Jefferson County, Texas
AQI 52 · 42.4% good
McLennan County, Texas
AQI 52 · 43.4% good
Orange County, California
AQI 52 · 44.5% good
Union County, Arkansas
AQI 52 · 44.0% good
Wayne County, Michigan
AQI 52 · 46.4% good
What Duval 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 52 means for exposure. Health guidance
- See how Duval County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Duval County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 182 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 Duval County, Florida? ▼
Duval County has a median Air Quality Index (AQI) of 52, rated "Moderate." 40.7% of monitored days (74 out of 182) had good air quality in 2025.
What is the main pollutant in Duval County? ▼
The primary pollutant in Duval County is Fine Particles (PM2.5), which was the main AQI driver on 134 days (74% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Duval County have? ▼
In 2025, Duval County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 136.
Is the air quality in Duval County getting better or worse? ▼
Air quality in Duval County is worsening based on 5-year trends (2020-2025). Best year: 2024 with 190 good days. Worst year: 2025 with 74 good days.
What does AQI 52 mean for health? ▼
Duval County's median AQI of 52 falls in the "Moderate" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Duval County compare to other counties in Florida? ▼
Duval County has 40.7% 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 Duval County? ▼
The 90th percentile AQI for Duval County is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 136 (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.
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.