Median AQI
48
Good
Florida · County air quality · 2025
Columbia County, Florida
Median AQI 48 (Good). 57.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 48
- Median AQI
- 57.3%
- Good-air days
- 0
- Unhealthy days
- 12%
- Cleaner than US counties
Columbia County's 2025 annual median AQI is 48 (Good), with 57.3% Good days
According to the U.S. EPA Air Quality System, Columbia County, Florida posted a 2025 median AQI of 48 (Good) across 365 monitored days, with 57.3% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Columbia County's 57.3% Good-day share places it cleaner than 12% of US counties in 2025.
- Closest median-AQI peer
- Adair County (55.8% Good, median AQI 48) is the closest nationwide median-AQI peer to Columbia County.
- 2020–2025 trend
- Columbia County's floor-qualifying Good-day share is worsening from 2020 to 2025 (63.3% → 57.3%).
- Median AQI
- Median AQI: 48
The verdict
According to EPA Air Quality System monitoring data, Columbia County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 48 with 57.3% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 48
- median AQI · Good
- 57.3%
- days rated Good
- PM2.5
- main pollutant
- 12%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 80.
Annual release change
What changed in the 2025 EPA annual release
- Columbia County's Good-day share fell from 63.0% to 57.3% between the 2024 and 2025 EPA annual releases, a change of -5.8 percentage points.
- Columbia County's median AQI rose from 44 to 48 between the 2024 and 2025 EPA annual releases, a change of +4 points.
- Columbia County's peak single-day AQI fell from 93 to 80 between the 2024 and 2025 EPA annual releases, a change of -13 points.
Data updated August 2026
- Good · 209 d · 57.3%
- Moderate · 156 d · 42.7%
How did Columbia County's air break down in 2025?
Across 365 monitored days, 209 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 80 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 48 (Good).
Insights: Columbia County, Florida. EPA monitors recorded a median Air Quality Index of 48 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 209 (57%) fell in the Good band (AQI 0–50), 156 (43%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 59, while the worst single-day peak hit 80 (Moderate). Residents averaged about 17.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (302 days), Ozone (63 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -6.1 points (measured against 311 monitored days in 2020 and 365 in 2025, so raw day counts are not comparable) and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 80, moderate but never Unhealthy. Nearby counties show comparable readings: Alachua (88.7% good, AQI 37); Baker (69.5% good, AQI 44); Bay (66.4% good, AQI 44); Brevard (91.2% good, AQI 38); Broward (73.4% good, AQI 43); Citrus (71.1% good, AQI 43).
Air Quality Summary
Good Days
57.3%
209 of 365 monitored days
-17.7pp vs 75% target
Max AQI Recorded
80
Moderate
Health Grade
Moderate
90th-pct AQI 59
Columbia County, Good days share 57.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Columbia 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 365 monitored days across EPA AQI categories.
Good
209
57%
Moderate
156
43%
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 Columbia County.
- PM2.5 · 302 days · 82.7%
- Ozone · 63 days · 17.3%
Health Impact Assessment
Moderate
Columbia County's air quality is rated Moderate based on 57.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 57.3% of monitored days in 2025, with a median AQI of 48. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 302 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Columbia County. Highest Good-day share: 2021 (64.8%, 236 of 364 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 197 | 111 | 1 | 2 | 44 | 160 |
| 2021 | 236 | 128 | 0 | 0 | 44 | 77 |
| 2022 | 234 | 129 | 0 | 0 | 45 | 91 |
| 2023 | 212 | 151 | 0 | 0 | 47 | 92 |
| 2024 | 220 | 129 | 0 | 0 | 44 | 93 |
| 2025 | 209 | 156 | 0 | 0 | 48 | 80 |
How does Columbia County compare?
How Columbia County compares
Good-day share worse than typical
Columbia County 57.3%
Adair County, Oklahoma 55.8%
Typical US county 76.0%
Median AQI worse than typical
Columbia County 48
Adair County, Oklahoma 48
Typical US county 39
Unhealthy days / yr better than typical
Columbia County 0
Adair County, Oklahoma 2
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Columbia County (48), not geographic neighbors.
Adair County, Oklahoma
Median AQI 48 · 55.8% Good-day share
Arapahoe County, Colorado
Median AQI 48 · 58.1% Good-day share
Arkansas County, Arkansas
Median AQI 48 · 52.9% Good-day share
Ashley County, Arkansas
Median AQI 48 · 55.7% Good-day share
Boulder County, Colorado
Median AQI 48 · 58.4% Good-day share
Bowie County, Texas
Median AQI 48 · 55.0% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Dougherty County, Georgia
57.3% Good-day share · median AQI 46
Jackson County, Missouri
57.3% Good-day share · median AQI 47
Sedgwick County, Kansas
57.5% Good-day share · median AQI 48
Cleveland County, Oklahoma
56.9% Good-day share · median AQI 48
Hall County, Georgia
57.7% Good-day share · median AQI 46
Pittsburg County, Oklahoma
56.7% Good-day share · median AQI 48
Florida counties on the map
Geographic containment only, other monitored counties in Florida, independent of AQI or pollutant match.
What Columbia 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 48 means for exposure. Health guidance
- See how Columbia County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Columbia County with its Florida neighbours before drawing a conclusion about the region. All of Florida
Based on 365 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Columbia County, Florida? ▼
Columbia County has a median Air Quality Index (AQI) of 48, rated "Good." 57.3% of monitored days (209 out of 365) had good air quality in 2025.
What is the main pollutant in Columbia County? ▼
The primary pollutant in Columbia County is Fine Particles (PM2.5), which was the main AQI driver on 302 days (83% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Columbia County have? ▼
In 2025, Columbia County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 80.
Is the air quality in Columbia County getting better or worse? ▼
Air quality in Columbia County is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2021 at 64.8% (236 of 364 days). Lowest qualifying Good-day share: 2025 at 57.3% (209 of 365 days).
What does AQI 48 mean for health? ▼
Columbia County's median AQI of 48 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Columbia County compare to other counties in Florida? ▼
Columbia County has 57.3% good air days. Nearby counties in Florida: Alachua (88.7% good), Baker (69.5% good), Bay (66.4% good), Brevard (91.2% good), Broward (73.4% good), Citrus (71.1% good).
What is the 90th percentile AQI in Columbia County? ▼
The 90th percentile AQI for Columbia County is 59, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 80 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Columbia County, Florida · 2020–2025
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Every figure on PlainAirData 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.