Median AQI
37
Good
Florida · County air quality · 2025
Pasco County, Florida
Median AQI 37 (Good). 91.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 37
- Median AQI
- 91.6%
- Good-air days
- 0
- Unhealthy days
- 79%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Pasco County's air is good on balance, cleaner than most US counties, a median AQI of 37 with 91.6% of 273 monitored days in the Good band, driven mainly by Ozone.
- 37
- median AQI · Good
- 91.6%
- days rated Good
- Ozone
- main pollutant
- 79%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 115.
Data updated July 2026
- Good · 250 d · 91.6%
- Moderate · 22 d · 8.1%
- USG · 1 d · 0.4%
How did Pasco County's air break down in 2025?
Across 273 monitored days, 250 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 115 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 273 days monitored. Median AQI: 37 (Good).
Insights: Pasco County, Florida. EPA monitors recorded a median Air Quality Index of 37 across 273 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 250 (92%) fell in the Good band (AQI 0–50), 22 (8%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 49, while the worst single-day peak hit 115 (USG). Residents averaged about 27.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (273 days). Across the 2020–2025 trend window, good days shifted by -105 and the median AQI moved +2 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 115, 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
91.6%
250 of 273 monitored days
16.6pp vs 75% target
Max AQI Recorded
115
USG
Health Grade
Excellent
90th-pct AQI 49
Pasco County, Good days share 91.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Pasco 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 273 monitored days across EPA AQI categories.
Good
250
92%
Moderate
22
8%
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 Pasco County.
- Ozone · 273 days · 100.0%
Health Impact Assessment
Excellent
Pasco County's air quality is rated Excellent based on 91.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 91.6% of monitored days in 2025, with a median AQI of 37. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 273 of 273 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Pasco County. Best year: 2020 (355 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 355 | 11 | 0 | 0 | 35 | 77 |
| 2021 | 346 | 19 | 0 | 0 | 35 | 87 |
| 2022 | 332 | 29 | 0 | 0 | 37 | 87 |
| 2023 | 323 | 42 | 0 | 0 | 39 | 97 |
| 2024 | 320 | 34 | 0 | 0 | 39 | 97 |
| 2025 | 250 | 22 | 1 | 0 | 37 | 115 |
How does Pasco County compare?
How Pasco County compares
Good-day share better than US avg
Pasco County 91.6%
Alachua County, Florida 90.1%
US average 76.5%
Median AQI better than US avg
Pasco County 37
Alachua County, Florida 37
US average 38
Unhealthy days / yr about average
Pasco 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 Pasco County.
Alachua County, Florida
AQI 37 · 90.1% good
Beltrami County, Minnesota
AQI 37 · 88.8% good
Benewah County, Idaho
AQI 37 · 74.6% good
Brevard County, Florida
AQI 37 · 89.7% good
Brown County, Indiana
AQI 37 · 94.5% good
Brown County, Wisconsin
AQI 37 · 79.0% good
What Pasco 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 37 means for exposure. Health guidance
- See how Pasco County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Pasco County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 273 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 Pasco County, Florida? ▼
Pasco County has a median Air Quality Index (AQI) of 37, rated "Good." 91.6% of monitored days (250 out of 273) had good air quality in 2025.
What is the main pollutant in Pasco County? ▼
The primary pollutant in Pasco County is Ozone (O3), which was the main AQI driver on 273 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Pasco County have? ▼
In 2025, Pasco County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 115.
Is the air quality in Pasco County getting better or worse? ▼
Air quality in Pasco County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 355 good days. Worst year: 2025 with 250 good days.
What does AQI 37 mean for health? ▼
Pasco County's median AQI of 37 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 Pasco County compare to other counties in Florida? ▼
Pasco County has 91.6% 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 Pasco County? ▼
The 90th percentile AQI for Pasco County is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 115 (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.