EnviroNearby

Highlands County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Highlands, Florida, 2001–2025.

95%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
356
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Highlands, Florida on 356 days. 338 of those days (95%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Florida (median 41 across 38 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 356 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 93% in 2001–2003 versus 94% in 2023–2025.

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%2001: Good 183 of 187 days2001: Moderate 4 of 187 days20012002: Good 317 of 353 days2002: Moderate 35 of 353 days2002: Unhealthy for Sensitive Groups 1 of 353 days2003: Good 326 of 359 days2003: Moderate 24 of 359 days2003: Unhealthy for Sensitive Groups 9 of 359 days20032004: Good 291 of 338 days2004: Moderate 43 of 338 days2004: Unhealthy for Sensitive Groups 4 of 338 days2005: Good 314 of 358 days2005: Moderate 39 of 358 days2005: Unhealthy for Sensitive Groups 5 of 358 days20052006: Good 290 of 364 days2006: Moderate 65 of 364 days2006: Unhealthy for Sensitive Groups 9 of 364 days2007: Good 300 of 357 days2007: Moderate 54 of 357 days2007: Unhealthy for Sensitive Groups 3 of 357 days20072008: Good 340 of 363 days2008: Moderate 18 of 363 days2008: Unhealthy for Sensitive Groups 5 of 363 days2009: Good 341 of 354 days2009: Moderate 13 of 354 days20092010: Good 312 of 348 days2010: Moderate 36 of 348 days2011: Good 330 of 358 days2011: Moderate 28 of 358 days20112012: Good 337 of 352 days2012: Moderate 15 of 352 days2013: Good 336 of 360 days2013: Moderate 24 of 360 days20132014: Good 327 of 350 days2014: Moderate 23 of 350 days2015: Good 345 of 356 days2015: Moderate 11 of 356 days20152016: Good 347 of 363 days2016: Moderate 16 of 363 days2017: Good 319 of 334 days2017: Moderate 15 of 334 days20172018: Good 337 of 351 days2018: Moderate 13 of 351 days2018: Unhealthy for Sensitive Groups 1 of 351 days2019: Good 224 of 233 days2019: Moderate 9 of 233 days20192020: Good 345 of 358 days2020: Moderate 13 of 358 days2021: Good 344 of 358 days2021: Moderate 14 of 358 days20212022: Good 337 of 349 days2022: Moderate 11 of 349 days2022: Unhealthy for Sensitive Groups 1 of 349 days2023: Good 345 of 360 days2023: Moderate 14 of 360 days2023: Unhealthy for Sensitive Groups 1 of 360 days20232024: Good 333 of 363 days2024: Moderate 30 of 363 days2025: Good 338 of 356 days2025: Moderate 18 of 356 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 year0501002001: 90th percentile AQI 432002: 90th percentile AQI 512003: 90th percentile AQI 502004: 90th percentile AQI 612005: 90th percentile AQI 582006: 90th percentile AQI 712007: 90th percentile AQI 612008: 90th percentile AQI 472009: 90th percentile AQI 462010: 90th percentile AQI 512011: 90th percentile AQI 502012: 90th percentile AQI 472013: 90th percentile AQI 472014: 90th percentile AQI 472015: 90th percentile AQI 442016: 90th percentile AQI 462017: 90th percentile AQI 462018: 90th percentile AQI 472019: 90th percentile AQI 462020: 90th percentile AQI 442021: 90th percentile AQI 462022: 90th percentile AQI 462023: 90th percentile AQI 452024: 90th percentile AQI 502025: 90th percentile AQI 472001: Median AQI 322002: Median AQI 362003: Median AQI 362004: Median AQI 382005: Median AQI 372006: Median AQI 382007: Median AQI 362008: Median AQI 332009: Median AQI 332010: Median AQI 362011: Median AQI 342012: Median AQI 342013: Median AQI 312014: Median AQI 322015: Median AQI 312016: Median AQI 332017: Median AQI 322018: Median AQI 312019: Median AQI 362020: Median AQI 312021: Median AQI 332022: Median AQI 332023: Median AQI 352024: Median AQI 352025: Median AQI 352001200320052007200920112013201520172019202120232025
  • 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
Ozone356100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025356338180000354780Ozone
2024363333300000355077Ozone
20233603451410003545108Ozone
20223493371110003346112Ozone
2021358344140000334693Ozone
2020358345130000314474Ozone
201923322490000364684Ozone
20183513371310003147108Ozone
2017334319150000324690Ozone
2016363347160000334687Ozone
2015356345110000314480Ozone
2014350327230000324777Ozone
2013360336240000314784Ozone
2012352337150000344784Ozone
2011358330280000345090Ozone
2010348312360000365197Ozone
2009354341130000334684Ozone
20083633401850003347122Ozone
20073573005430003661122Ozone
20063642906590003871136Ozone
20053583143950003758112Ozone
20043382914340003861108Ozone
20033593262490003650129Ozone
20023533173510003651119Ozone
200118718340000324380Ozone

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 2001–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem