EnviroNearby

Leon County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Leon, Florida, 1980–2025.

56%
Good days in 2025
48
Median daily AQI, 2025
1
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 Leon, Florida on 365 days. 206 of those days (56%) 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 292 days. Across the years with fuller monitoring, the share of Good days fell: an average of 79% in 1980–1982 versus 60% in 2023–2025.

Years with fewer than 120 monitored days (1989, 1991) 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%1980: Good 256 of 327 days1980: Moderate 55 of 327 days1980: Unhealthy for Sensitive Groups 13 of 327 days1980: Unhealthy 3 of 327 days19801981: Good 252 of 341 days1981: Moderate 70 of 341 days1981: Unhealthy for Sensitive Groups 17 of 341 days1981: Unhealthy 2 of 341 days1982: Good 284 of 331 days1982: Moderate 39 of 331 days1982: Unhealthy for Sensitive Groups 7 of 331 days1982: Unhealthy 1 of 331 days1983: Good 243 of 271 days1983: Moderate 24 of 271 days1983: Unhealthy for Sensitive Groups 4 of 271 days1984: Good 304 of 363 days1984: Moderate 47 of 363 days1984: Unhealthy for Sensitive Groups 12 of 363 days1985: Good 340 of 359 days1985: Moderate 19 of 359 days19851986: Good 307 of 353 days1986: Moderate 40 of 353 days1986: Unhealthy for Sensitive Groups 6 of 353 days1987: Good 222 of 252 days1987: Moderate 27 of 252 days1987: Unhealthy for Sensitive Groups 3 of 252 days1988: Good 285 of 363 days1988: Moderate 60 of 363 days1988: Unhealthy for Sensitive Groups 18 of 363 days1989: Good 94 of 100 days1989: Moderate 5 of 100 days1989: Unhealthy for Sensitive Groups 1 of 100 days1991: Good 25 of 25 days19911992: Good 160 of 204 days1992: Moderate 37 of 204 days1992: Unhealthy for Sensitive Groups 7 of 204 days1995: Good 207 of 265 days1995: Moderate 53 of 265 days1995: Unhealthy for Sensitive Groups 5 of 265 days1996: Good 303 of 364 days1996: Moderate 54 of 364 days1996: Unhealthy for Sensitive Groups 7 of 364 days1997: Good 353 of 354 days1997: Moderate 1 of 354 days1998: Good 316 of 359 days1998: Moderate 33 of 359 days1998: Unhealthy for Sensitive Groups 10 of 359 days19981999: Good 219 of 365 days1999: Moderate 127 of 365 days1999: Unhealthy for Sensitive Groups 18 of 365 days1999: Unhealthy 1 of 365 days2000: Good 209 of 361 days2000: Moderate 134 of 361 days2000: Unhealthy for Sensitive Groups 18 of 361 days2001: Good 249 of 365 days2001: Moderate 108 of 365 days2001: Unhealthy for Sensitive Groups 8 of 365 days2002: Good 244 of 365 days2002: Moderate 116 of 365 days2002: Unhealthy for Sensitive Groups 5 of 365 days2003: Good 183 of 365 days2003: Moderate 177 of 365 days2003: Unhealthy for Sensitive Groups 5 of 365 days20032004: Good 73 of 364 days2004: Moderate 275 of 364 days2004: Unhealthy for Sensitive Groups 14 of 364 days2004: Unhealthy 2 of 364 days2005: Good 66 of 365 days2005: Moderate 286 of 365 days2005: Unhealthy for Sensitive Groups 11 of 365 days2005: Unhealthy 2 of 365 days2006: Good 58 of 365 days2006: Moderate 299 of 365 days2006: Unhealthy for Sensitive Groups 8 of 365 days2007: Good 64 of 365 days2007: Moderate 279 of 365 days2007: Unhealthy for Sensitive Groups 14 of 365 days2007: Unhealthy 7 of 365 days2007: Hazardous 1 of 365 days2008: Good 71 of 366 days2008: Moderate 288 of 366 days2008: Unhealthy for Sensitive Groups 7 of 366 days20082009: Good 127 of 365 days2009: Moderate 235 of 365 days2009: Unhealthy for Sensitive Groups 2 of 365 days2009: Unhealthy 1 of 365 days2010: Good 113 of 365 days2010: Moderate 251 of 365 days2010: Unhealthy 1 of 365 days2011: Good 142 of 365 days2011: Moderate 216 of 365 days2011: Unhealthy for Sensitive Groups 6 of 365 days2011: Unhealthy 1 of 365 days2012: Good 190 of 366 days2012: Moderate 172 of 366 days2012: Unhealthy for Sensitive Groups 4 of 366 days2013: Good 239 of 365 days2013: Moderate 123 of 365 days2013: Unhealthy for Sensitive Groups 2 of 365 days2013: Very Unhealthy 1 of 365 days20132014: Good 158 of 365 days2014: Moderate 206 of 365 days2014: Unhealthy 1 of 365 days2015: Good 173 of 363 days2015: Moderate 190 of 363 days2016: Good 204 of 361 days2016: Moderate 157 of 361 days2017: Good 186 of 357 days2017: Moderate 171 of 357 days2018: Good 217 of 355 days2018: Moderate 138 of 355 days20182019: Good 215 of 360 days2019: Moderate 144 of 360 days2019: Unhealthy for Sensitive Groups 1 of 360 days2020: Good 185 of 366 days2020: Moderate 178 of 366 days2020: Unhealthy for Sensitive Groups 2 of 366 days2020: Unhealthy 1 of 366 days2021: Good 194 of 365 days2021: Moderate 171 of 365 days2022: Good 211 of 364 days2022: Moderate 153 of 364 days2023: Good 204 of 361 days2023: Moderate 156 of 361 days2023: Unhealthy for Sensitive Groups 1 of 361 days20232024: Good 243 of 355 days2024: Moderate 111 of 355 days2024: Unhealthy for Sensitive Groups 1 of 355 days2025: Good 206 of 365 days2025: Moderate 158 of 365 days2025: Unhealthy for Sensitive Groups 1 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 year0501001980: 90th percentile AQI 741981: 90th percentile AQI 871982: 90th percentile AQI 611983: 90th percentile AQI 511984: 90th percentile AQI 611985: 90th percentile AQI 441986: 90th percentile AQI 581987: 90th percentile AQI 611988: 90th percentile AQI 871989: 90th percentile AQI 471991: 90th percentile AQI 311992: 90th percentile AQI 801995: 90th percentile AQI 711996: 90th percentile AQI 641997: 90th percentile AQI 231998: 90th percentile AQI 541999: 90th percentile AQI 842000: 90th percentile AQI 872001: 90th percentile AQI 712002: 90th percentile AQI 722003: 90th percentile AQI 742004: 90th percentile AQI 842005: 90th percentile AQI 842006: 90th percentile AQI 842007: 90th percentile AQI 852008: 90th percentile AQI 762009: 90th percentile AQI 692010: 90th percentile AQI 672011: 90th percentile AQI 772012: 90th percentile AQI 652013: 90th percentile AQI 612014: 90th percentile AQI 652015: 90th percentile AQI 622016: 90th percentile AQI 602017: 90th percentile AQI 642018: 90th percentile AQI 612019: 90th percentile AQI 632020: 90th percentile AQI 632021: 90th percentile AQI 592022: 90th percentile AQI 602023: 90th percentile AQI 612024: 90th percentile AQI 592025: 90th percentile AQI 601980: Median AQI 371981: Median AQI 411982: Median AQI 341983: Median AQI 341984: Median AQI 341985: Median AQI 261986: Median AQI 341987: Median AQI 351988: Median AQI 371989: Median AQI 321991: Median AQI 281992: Median AQI 381995: Median AQI 381996: Median AQI 331997: Median AQI 131998: Median AQI 261999: Median AQI 442000: Median AQI 462001: Median AQI 412002: Median AQI 402003: Median AQI 502004: Median AQI 592005: Median AQI 592006: Median AQI 602007: Median AQI 592008: Median AQI 572009: Median AQI 542010: Median AQI 542011: Median AQI 542012: Median AQI 502013: Median AQI 432014: Median AQI 522015: Median AQI 512016: Median AQI 482017: Median AQI 492018: Median AQI 462019: Median AQI 462020: Median AQI 492021: Median AQI 482022: Median AQI 472023: Median AQI 472024: Median AQI 442025: Median AQI 481980198519911998200320082013201820232025
  • 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)29280%
Ozone7320%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536520615810004860140PM2.5
202435524311110004459129PM2.5
202336120415610004761124PM2.5
20223642111530000476093PM2.5
20213651941710000485980PM2.5
202036618517821004963163PM2.5
201936021514410004663119PM2.5
20183552171380000466197PM2.5
20173571861710000496489PM2.5
20163612041570000486085PM2.5
20153631731900000516297PM2.5
201436515820601005265159PM2.5
201336523912320104361246PM2.5
201236619017240005065147PM2.5
201136514221661005477159PM2.5
201036511325101005467160PM2.5
200936512723521005469159PM2.5
20083667128870005776129PM2.5
200736564279147015985400PM2.5
20063655829980006084126PM2.5
200536566286112005984161PM2.5
200436473275142005984157PM2.5
200336518317750005074147PM2.5
200236524411650004072122Ozone
200136524910880004171133Ozone
2000361209134180004687140Ozone
1999365219127181004484159Ozone
199835931633100002654143Ozone
199735435310000132367PM10
19963643035470003364140Ozone
19952652075350003871147Ozone
19922041603770003880129Ozone
1991252500000283135Ozone
198910094510003247133Ozone
198836328560180003787147Ozone
19872522222730003561119Ozone
19863533074060003458122Ozone
19853593401900002644100Ozone
198436330447120003461133Ozone
19832712432440003451112Ozone
19823312843971003461151Ozone
198134125270172004187154Ozone
198032725655133003774172Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem