EnviroNearby

Liberty County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Liberty, Florida, 1990–2025.

99%
Good days in 2025
33
Median daily AQI, 2025
0
Days above 100 in 2025
341
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Liberty, Florida on 341 days. 336 of those days (99%) were in the Good range, and the median daily AQI was 33. 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 341 days. Across the years with fuller monitoring, the share of Good days rose: an average of 83% in 1990–1992 versus 99% 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%1990: Good 255 of 316 days1990: Moderate 58 of 316 days1990: Unhealthy for Sensitive Groups 2 of 316 days1990: Unhealthy 1 of 316 days19901991: Good 288 of 328 days1991: Moderate 36 of 328 days1991: Unhealthy for Sensitive Groups 4 of 328 days1992: Good 291 of 355 days1992: Moderate 53 of 355 days1992: Unhealthy for Sensitive Groups 11 of 355 days1993: Good 271 of 326 days1993: Moderate 52 of 326 days1993: Unhealthy for Sensitive Groups 3 of 326 days1994: Good 300 of 342 days1994: Moderate 33 of 342 days1994: Unhealthy for Sensitive Groups 9 of 342 days1995: Good 273 of 331 days1995: Moderate 55 of 331 days1995: Unhealthy for Sensitive Groups 3 of 331 days19951996: Good 310 of 363 days1996: Moderate 49 of 363 days1996: Unhealthy for Sensitive Groups 4 of 363 days1997: Good 302 of 359 days1997: Moderate 50 of 359 days1997: Unhealthy for Sensitive Groups 7 of 359 days1998: Good 272 of 352 days1998: Moderate 63 of 352 days1998: Unhealthy for Sensitive Groups 16 of 352 days1998: Unhealthy 1 of 352 days1999: Good 276 of 360 days1999: Moderate 70 of 360 days1999: Unhealthy for Sensitive Groups 14 of 360 days2000: Good 253 of 355 days2000: Moderate 84 of 355 days2000: Unhealthy for Sensitive Groups 18 of 355 days20002001: Good 317 of 354 days2001: Moderate 34 of 354 days2001: Unhealthy for Sensitive Groups 3 of 354 days2002: Good 338 of 360 days2002: Moderate 21 of 360 days2002: Unhealthy for Sensitive Groups 1 of 360 days2003: Good 327 of 363 days2003: Moderate 32 of 363 days2003: Unhealthy for Sensitive Groups 4 of 363 days2004: Good 310 of 351 days2004: Moderate 40 of 351 days2004: Unhealthy for Sensitive Groups 1 of 351 days2005: Good 305 of 360 days2005: Moderate 53 of 360 days2005: Unhealthy for Sensitive Groups 2 of 360 days20052006: Good 309 of 360 days2006: Moderate 50 of 360 days2006: Unhealthy for Sensitive Groups 1 of 360 days2007: Good 308 of 343 days2007: Moderate 35 of 343 days2008: Good 323 of 354 days2008: Moderate 31 of 354 days2009: Good 323 of 332 days2009: Moderate 9 of 332 days2010: Good 293 of 324 days2010: Moderate 31 of 324 days20102011: Good 303 of 330 days2011: Moderate 27 of 330 days2012: Good 336 of 356 days2012: Moderate 20 of 356 days2013: Good 272 of 282 days2013: Moderate 10 of 282 days2014: Good 343 of 351 days2014: Moderate 8 of 351 days2015: Good 345 of 352 days2015: Moderate 7 of 352 days20152016: Good 333 of 342 days2016: Moderate 9 of 342 days2017: Good 350 of 355 days2017: Moderate 5 of 355 days2018: Good 273 of 284 days2018: Moderate 11 of 284 days2019: Good 339 of 351 days2019: Moderate 12 of 351 days2020: Good 356 of 358 days2020: Moderate 2 of 358 days20202021: Good 358 of 364 days2021: Moderate 6 of 364 days2022: Good 346 of 355 days2022: Moderate 9 of 355 days2023: Good 340 of 347 days2023: Moderate 7 of 347 days2024: Good 327 of 330 days2024: Moderate 3 of 330 days2025: Good 336 of 341 days2025: Moderate 5 of 341 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 year0501001990: 90th percentile AQI 711991: 90th percentile AQI 581992: 90th percentile AQI 671993: 90th percentile AQI 641994: 90th percentile AQI 541995: 90th percentile AQI 671996: 90th percentile AQI 541997: 90th percentile AQI 711998: 90th percentile AQI 771999: 90th percentile AQI 802000: 90th percentile AQI 872001: 90th percentile AQI 512002: 90th percentile AQI 472003: 90th percentile AQI 502004: 90th percentile AQI 542005: 90th percentile AQI 582006: 90th percentile AQI 582007: 90th percentile AQI 512008: 90th percentile AQI 502009: 90th percentile AQI 442010: 90th percentile AQI 502011: 90th percentile AQI 492012: 90th percentile AQI 472013: 90th percentile AQI 442014: 90th percentile AQI 442015: 90th percentile AQI 412016: 90th percentile AQI 452017: 90th percentile AQI 442018: 90th percentile AQI 472019: 90th percentile AQI 452020: 90th percentile AQI 442021: 90th percentile AQI 442022: 90th percentile AQI 452023: 90th percentile AQI 442024: 90th percentile AQI 432025: 90th percentile AQI 441990: Median AQI 411991: Median AQI 371992: Median AQI 371993: Median AQI 391994: Median AQI 351995: Median AQI 401996: Median AQI 381997: Median AQI 361998: Median AQI 401999: Median AQI 402000: Median AQI 412001: Median AQI 352002: Median AQI 332003: Median AQI 322004: Median AQI 352005: Median AQI 352006: Median AQI 362007: Median AQI 362008: Median AQI 332009: Median AQI 332010: Median AQI 362011: Median AQI 352012: Median AQI 322013: Median AQI 292014: Median AQI 322015: Median AQI 312016: Median AQI 332017: Median AQI 312018: Median AQI 312019: Median AQI 332020: Median AQI 312021: Median AQI 322022: Median AQI 322023: Median AQI 332024: Median AQI 312025: Median AQI 3319901995200020052010201520202025
  • 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
Ozone341100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202534133650000334477Ozone
202433032730000314354Ozone
202334734070000334464Ozone
202235534690000324574Ozone
202136435860000324461Ozone
202035835620000314451Ozone
2019351339120000334574Ozone
2018284273110000314771Ozone
201735535050000314461Ozone
201634233390000334567Ozone
201535234570000314161Ozone
201435134380000324461Ozone
2013282272100000294487Ozone
2012356336200000324780Ozone
2011330303270000354974Ozone
2010324293310000365093Ozone
200933232390000334467Ozone
2008354323310000335090Ozone
2007343308350000365197Ozone
20063603095010003658112Ozone
20053603055320003558122Ozone
20043513104010003554108Ozone
20033633273240003250140Ozone
20023603382110003347105Ozone
20013543173430003551126Ozone
200035525384180004187150Ozone
199936027670140004080140Ozone
199835227263161004077161Ozone
19973593025070003671140Ozone
19963633104940003854119Ozone
19953312735530004067133Ozone
19943423003390003554140Ozone
19933262715230003964105Ozone
199235529153110003767133Ozone
19913282883640003758126Ozone
19903162555821004171151Ozone

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 1990–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem