Median AQI
44
Good
Florida · County air quality · 2025
Orange County, Florida
Median AQI 44 (Good). 71.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 71.5%
- Good-air days
- 0
- Unhealthy days
- 34%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Orange County's air is good on balance, more polluted than the median US county, a median AQI of 44 with 71.5% of 274 monitored days in the Good band, driven mainly by Ozone.
- 44
- median AQI · Good
- 71.5%
- days rated Good
- Ozone
- main pollutant
- 34%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 105.
Data updated July 2026
- Good · 196 d · 71.5%
- Moderate · 77 d · 28.1%
- USG · 1 d · 0.4%
How did Orange County's air break down in 2025?
Across 274 monitored days, 196 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 105 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 274 days monitored. Median AQI: 44 (Good).
Insights: Orange County, Florida. EPA monitors recorded a median Air Quality Index of 44 across 274 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 196 (72%) fell in the Good band (AQI 0–50), 77 (28%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 61, while the worst single-day peak hit 105 (USG). Residents averaged about 21.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (142 days), PM2.5 (128 days), NO2 (3 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -158 and the median AQI moved +10 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 105, 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
71.5%
196 of 274 monitored days
-3.5pp vs 75% target
Max AQI Recorded
105
USG
Health Grade
Moderate
90th-pct AQI 61
Orange County, Good days share 71.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Orange 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 274 monitored days across EPA AQI categories.
Good
196
72%
Moderate
77
28%
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 Orange County.
- Ozone · 142 days · 51.8%
- PM2.5 · 128 days · 46.7%
- NO₂ · 3 days · 1.1%
- CO · 1 days · 0.4%
Health Impact Assessment
Moderate
Orange County's air quality is rated Moderate based on 71.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 71.5% of monitored days in 2025, with a median AQI of 44. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 142 of 274 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Orange County. Best year: 2021 (354 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 354 | 12 | 0 | 0 | 34 | 93 |
| 2021 | 354 | 11 | 0 | 0 | 33 | 87 |
| 2022 | 317 | 48 | 0 | 0 | 39 | 97 |
| 2023 | 267 | 96 | 2 | 0 | 43 | 115 |
| 2024 | 272 | 86 | 2 | 0 | 41 | 121 |
| 2025 | 196 | 77 | 1 | 0 | 44 | 105 |
How does Orange County compare?
How Orange County compares
Good-day share worse than US avg
Orange County 71.5%
Alachua County, Florida 90.1%
US average 76.5%
Median AQI worse than US avg
Orange County 44
Alachua County, Florida 37
US average 38
Unhealthy days / yr about average
Orange 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 Orange County.
Baltimore County, Maryland
AQI 44 · 70.4% good
Baltimore (City) County, Maryland
AQI 44 · 68.7% good
Bartholomew County, Indiana
AQI 44 · 69.2% good
Berks County, Pennsylvania
AQI 44 · 65.6% good
Bolivar County, Mississippi
AQI 44 · 70.3% good
Brewster County, Texas
AQI 44 · 69.0% good
What Orange 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 44 means for exposure. Health guidance
- See how Orange County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Orange County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 274 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 Orange County, Florida? ▼
Orange County has a median Air Quality Index (AQI) of 44, rated "Good." 71.5% of monitored days (196 out of 274) had good air quality in 2025.
What is the main pollutant in Orange County? ▼
The primary pollutant in Orange County is Ozone (O3), which was the main AQI driver on 142 days (52% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Orange County have? ▼
In 2025, Orange County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 105.
Is the air quality in Orange County getting better or worse? ▼
Air quality in Orange County is worsening based on 5-year trends (2020-2025). Best year: 2021 with 354 good days. Worst year: 2025 with 196 good days.
What does AQI 44 mean for health? ▼
Orange County's median AQI of 44 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 Orange County compare to other counties in Florida? ▼
Orange County has 71.5% 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 Orange County? ▼
The 90th percentile AQI for Orange County is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 105 (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.