Median AQI
21
Good
Florida · County air quality · 2025
Putnam County, Florida
Median AQI 21 (Good). 96.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 21
- Median AQI
- 96.0%
- Good-air days
- 0
- Unhealthy days
- 91%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Putnam County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 21 with 96.0% of 273 monitored days in the Good band, driven mainly by PM10.
- 21
- median AQI · Good
- 96.0%
- days rated Good
- PM10
- main pollutant
- 91%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 69.
Data updated July 2026
- Good · 262 d · 96.0%
- Moderate · 11 d · 4.0%
How did Putnam County's air break down in 2025?
Across 273 monitored days, 262 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 69 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 273 days monitored. Median AQI: 21 (Good).
Insights: Putnam County, Florida. EPA monitors recorded a median Air Quality Index of 21 across 273 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 262 (96%) fell in the Good band (AQI 0–50), 11 (4%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 42, while the worst single-day peak hit 69 (Moderate). Residents averaged about 28.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM10 (273 days). Across the 2020–2025 trend window, good days shifted by -103 and the median AQI moved +7 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 69, 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
96.0%
262 of 273 monitored days
21.0pp vs 75% target
Max AQI Recorded
69
Moderate
Health Grade
Excellent
90th-pct AQI 42
Putnam County, Good days share 96.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Putnam 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
262
96%
Moderate
11
4%
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 Putnam County.
- PM10 · 273 days · 100.0%
Health Impact Assessment
Excellent
Putnam County's air quality is rated Excellent based on 96.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 96.0% of monitored days in 2025, with a median AQI of 21. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM10, driving AQI on 273 of 273 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Putnam County. Best year: 2020 (365 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 365 | 1 | 0 | 0 | 14 | 67 |
| 2021 | 340 | 0 | 0 | 0 | 16 | 46 |
| 2022 | 321 | 2 | 0 | 0 | 16 | 58 |
| 2023 | 355 | 1 | 0 | 0 | 17 | 54 |
| 2024 | 329 | 31 | 2 | 0 | 25 | 112 |
| 2025 | 262 | 11 | 0 | 0 | 21 | 69 |
How does Putnam County compare?
How Putnam County compares
Good-day share better than US avg
Putnam County 96.0%
Alachua County, Florida 90.1%
US average 76.5%
Median AQI better than US avg
Putnam County 21
Alachua County, Florida 37
US average 38
Unhealthy days / yr about average
Putnam 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 Putnam County.
Cowlitz County, Washington
AQI 21 · 91.6% good
Juneau County, Alaska
AQI 21 · 85.1% good
Kitsap County, Washington
AQI 21 · 96.2% good
Marin County, California
AQI 21 · 100.0% good
Mason County, Washington
AQI 21 · 92.6% good
Pitkin County, Colorado
AQI 21 · 91.6% good
What Putnam County's air means for you
The air here stays in the breathable range year-round, with PM10 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM10 days, the guide explains what a median of 21 means for exposure. Health guidance
- See how Putnam County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Putnam 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 Putnam County, Florida? ▼
Putnam County has a median Air Quality Index (AQI) of 21, rated "Good." 96.0% of monitored days (262 out of 273) had good air quality in 2025.
What is the main pollutant in Putnam County? ▼
The primary pollutant in Putnam County is Coarse Particles (PM10), which was the main AQI driver on 273 days (100% of monitored days). Irritates airways and can aggravate asthma and bronchitis.
How many unhealthy air days does Putnam County have? ▼
In 2025, Putnam County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 69.
Is the air quality in Putnam County getting better or worse? ▼
Air quality in Putnam County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 365 good days. Worst year: 2025 with 262 good days.
What does AQI 21 mean for health? ▼
Putnam County's median AQI of 21 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 Putnam County compare to other counties in Florida? ▼
Putnam County has 96.0% 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 Putnam County? ▼
The 90th percentile AQI for Putnam County is 42, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 69 (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.