EnviroNearby

Columbia County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Columbia, Florida, 2000–2025.

57%
Good days in 2025
48
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Columbia, Florida on 365 days. 209 of those days (57%) were in the Good range, and the median daily AQI was 48. That median is higher than the typical monitored county in Florida (median 41 across 38 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 302 days. Across the years with fuller monitoring, the share of Good days fell: an average of 86% in 2001–2003 versus 60% in 2023–2025.

Years with fewer than 120 monitored days (2000) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%2000: Good 55 of 60 days2000: Moderate 5 of 60 days20002001: Good 292 of 356 days2001: Moderate 57 of 356 days2001: Unhealthy for Sensitive Groups 7 of 356 days2002: Good 319 of 363 days2002: Moderate 42 of 363 days2002: Unhealthy for Sensitive Groups 2 of 363 days20022003: Good 325 of 364 days2003: Moderate 33 of 364 days2003: Unhealthy for Sensitive Groups 6 of 364 days2004: Good 309 of 358 days2004: Moderate 45 of 358 days2004: Unhealthy for Sensitive Groups 4 of 358 days20042005: Good 296 of 363 days2005: Moderate 60 of 363 days2005: Unhealthy for Sensitive Groups 7 of 363 days2006: Good 272 of 359 days2006: Moderate 83 of 359 days2006: Unhealthy for Sensitive Groups 4 of 359 days20062007: Good 168 of 365 days2007: Moderate 188 of 365 days2007: Unhealthy for Sensitive Groups 8 of 365 days2007: Unhealthy 1 of 365 days2008: Good 113 of 364 days2008: Moderate 251 of 364 days20082009: Good 166 of 365 days2009: Moderate 199 of 365 days2010: Good 147 of 361 days2010: Moderate 213 of 361 days2010: Unhealthy for Sensitive Groups 1 of 361 days20102011: Good 169 of 365 days2011: Moderate 195 of 365 days2011: Unhealthy for Sensitive Groups 1 of 365 days2012: Good 267 of 365 days2012: Moderate 96 of 365 days2012: Unhealthy for Sensitive Groups 1 of 365 days2012: Unhealthy 1 of 365 days20122013: Good 214 of 364 days2013: Moderate 150 of 364 days2014: Good 287 of 338 days2014: Moderate 51 of 338 days20142015: Good 249 of 321 days2015: Moderate 72 of 321 days2016: Good 235 of 345 days2016: Moderate 110 of 345 days20162017: Good 237 of 363 days2017: Moderate 126 of 363 days2018: Good 267 of 359 days2018: Moderate 91 of 359 days2018: Unhealthy for Sensitive Groups 1 of 359 days20182019: Good 229 of 363 days2019: Moderate 134 of 363 days2020: Good 197 of 311 days2020: Moderate 111 of 311 days2020: Unhealthy for Sensitive Groups 1 of 311 days2020: Unhealthy 2 of 311 days20202021: Good 236 of 364 days2021: Moderate 128 of 364 days2022: Good 234 of 363 days2022: Moderate 129 of 363 days20222023: Good 212 of 363 days2023: Moderate 151 of 363 days2024: Good 220 of 349 days2024: Moderate 129 of 349 days20242025: Good 209 of 365 days2025: Moderate 156 of 365 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501002000: 90th percentile AQI 422001: 90th percentile AQI 672002: 90th percentile AQI 512003: 90th percentile AQI 512004: 90th percentile AQI 582005: 90th percentile AQI 672006: 90th percentile AQI 772007: 90th percentile AQI 742008: 90th percentile AQI 692009: 90th percentile AQI 622010: 90th percentile AQI 662011: 90th percentile AQI 682012: 90th percentile AQI 582013: 90th percentile AQI 612014: 90th percentile AQI 542015: 90th percentile AQI 562016: 90th percentile AQI 592017: 90th percentile AQI 612018: 90th percentile AQI 582019: 90th percentile AQI 612020: 90th percentile AQI 612021: 90th percentile AQI 562022: 90th percentile AQI 602023: 90th percentile AQI 612024: 90th percentile AQI 612025: 90th percentile AQI 592000: Median AQI 312001: Median AQI 362002: Median AQI 362003: Median AQI 342004: Median AQI 362005: Median AQI 362006: Median AQI 412007: Median AQI 522008: Median AQI 552009: Median AQI 512010: Median AQI 522011: Median AQI 522012: Median AQI 382013: Median AQI 472014: Median AQI 362015: Median AQI 392016: Median AQI 432017: Median AQI 452018: Median AQI 412019: Median AQI 462020: Median AQI 442021: Median AQI 442022: Median AQI 452023: Median AQI 472024: Median AQI 442025: Median AQI 4820002002200420062008201020122014201620182020202220242025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Fine particles (PM2.5)30283%
Ozone6317%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652091560000485980PM2.5
20243492201290000446193PM2.5
20233632121510000476192PM2.5
20223632341290000456091PM2.5
20213642361280000445677PM2.5
202031119711112004461160PM2.5
20193632291340000466190PM2.5
20183592679110004158111PM2.5
201736323712600004561100PM2.5
20163452351100000435990PM2.5
2015321249720000395677Ozone
2014338287510000365482Ozone
20133642141500000476189PM2.5
20123652679611003858154Ozone
201136516919510005268112PM2.5
201036114721310005266101PM2.5
20093651661990000516294PM2.5
200836411325100005569100PM2.5
200736516818881005274162PM2.5
20063592728340004177122Ozone
20053632966070003667126Ozone
20043583094540003658122Ozone
20033643253360003451140Ozone
20023633194220003651133Ozone
20013562925770003667133Ozone
2000605550000314267Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Florida with a similar median AQI in 2025

All monitored counties in Florida

Source: U.S. EPA AirData, “Annual AQI by County” files for 2000–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem