EnviroNearby

Lake County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Lake, Florida, 1997–2025.

95%
Good days in 2025
35
Median daily AQI, 2025
1
Days above 100 in 2025
360
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Lake, Florida on 360 days. 342 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 360 days. Across the years with fuller monitoring, the share of Good days fell: an average of 100% in 1997–1999 versus 93% 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%1997: Good 341 of 341 days19971998: Good 341 of 343 days1998: Moderate 2 of 343 days1999: Good 351 of 352 days1999: Moderate 1 of 352 days2000: Good 340 of 356 days2000: Moderate 11 of 356 days2000: Unhealthy for Sensitive Groups 5 of 356 days2001: Good 306 of 365 days2001: Moderate 52 of 365 days2001: Unhealthy for Sensitive Groups 7 of 365 days2002: Good 310 of 365 days2002: Moderate 48 of 365 days2002: Unhealthy for Sensitive Groups 7 of 365 days20022003: Good 279 of 365 days2003: Moderate 74 of 365 days2003: Unhealthy for Sensitive Groups 11 of 365 days2003: Unhealthy 1 of 365 days2004: Good 151 of 344 days2004: Moderate 184 of 344 days2004: Unhealthy for Sensitive Groups 7 of 344 days2004: Unhealthy 2 of 344 days2005: Good 161 of 360 days2005: Moderate 189 of 360 days2005: Unhealthy for Sensitive Groups 9 of 360 days2005: Unhealthy 1 of 360 days2006: Good 172 of 335 days2006: Moderate 154 of 335 days2006: Unhealthy for Sensitive Groups 8 of 335 days2006: Unhealthy 1 of 335 days2007: Good 218 of 363 days2007: Moderate 134 of 363 days2007: Unhealthy for Sensitive Groups 10 of 363 days2007: Unhealthy 1 of 363 days20072008: Good 209 of 366 days2008: Moderate 154 of 366 days2008: Unhealthy for Sensitive Groups 3 of 366 days2009: Good 236 of 365 days2009: Moderate 128 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 199 of 365 days2010: Moderate 165 of 365 days2010: Unhealthy for Sensitive Groups 1 of 365 days2011: Good 221 of 360 days2011: Moderate 137 of 360 days2011: Unhealthy for Sensitive Groups 2 of 360 days2012: Good 332 of 362 days2012: Moderate 29 of 362 days2012: Unhealthy for Sensitive Groups 1 of 362 days20122013: Good 338 of 356 days2013: Moderate 17 of 356 days2013: Unhealthy for Sensitive Groups 1 of 356 days2014: Good 331 of 362 days2014: Moderate 29 of 362 days2014: Unhealthy for Sensitive Groups 2 of 362 days2015: Good 347 of 364 days2015: Moderate 17 of 364 days2016: Good 299 of 334 days2016: Moderate 34 of 334 days2016: Unhealthy for Sensitive Groups 1 of 334 days2017: Good 335 of 365 days2017: Moderate 28 of 365 days2017: Unhealthy for Sensitive Groups 2 of 365 days20172018: Good 331 of 363 days2018: Moderate 31 of 363 days2018: Unhealthy for Sensitive Groups 1 of 363 days2019: Good 301 of 330 days2019: Moderate 28 of 330 days2019: Unhealthy for Sensitive Groups 1 of 330 days2020: Good 354 of 366 days2020: Moderate 12 of 366 days2021: Good 338 of 356 days2021: Moderate 18 of 356 days2022: Good 349 of 364 days2022: Moderate 15 of 364 days20222023: Good 337 of 364 days2023: Moderate 27 of 364 days2024: Good 312 of 344 days2024: Moderate 32 of 344 days2025: Good 342 of 360 days2025: Moderate 17 of 360 days2025: Unhealthy for Sensitive Groups 1 of 360 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 year0501001997: 90th percentile AQI 211998: 90th percentile AQI 301999: 90th percentile AQI 252000: 90th percentile AQI 412001: 90th percentile AQI 672002: 90th percentile AQI 542003: 90th percentile AQI 622004: 90th percentile AQI 692005: 90th percentile AQI 762006: 90th percentile AQI 772007: 90th percentile AQI 702008: 90th percentile AQI 642009: 90th percentile AQI 582010: 90th percentile AQI 632011: 90th percentile AQI 662012: 90th percentile AQI 482013: 90th percentile AQI 462014: 90th percentile AQI 502015: 90th percentile AQI 442016: 90th percentile AQI 512017: 90th percentile AQI 492018: 90th percentile AQI 492019: 90th percentile AQI 502020: 90th percentile AQI 452021: 90th percentile AQI 482022: 90th percentile AQI 472023: 90th percentile AQI 492024: 90th percentile AQI 502025: 90th percentile AQI 471997: Median AQI 131998: Median AQI 151999: Median AQI 152000: Median AQI 192001: Median AQI 372002: Median AQI 372003: Median AQI 412004: Median AQI 522005: Median AQI 522006: Median AQI 502007: Median AQI 472008: Median AQI 472009: Median AQI 462010: Median AQI 492011: Median AQI 442012: Median AQI 352013: Median AQI 332014: Median AQI 332015: Median AQI 342016: Median AQI 372017: Median AQI 352018: Median AQI 332019: Median AQI 352020: Median AQI 322021: Median AQI 342022: Median AQI 352023: Median AQI 372024: Median AQI 362025: Median AQI 351997200220072012201720222025
  • 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
Ozone360100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253603421710003547112Ozone
20243443123200003650100Ozone
2023364337270000374997Ozone
2022364349150000354787Ozone
2021356338180000344887Ozone
2020366354120000324587Ozone
20193303012810003550101Ozone
20183633313110003349101Ozone
20173653352820003549122Ozone
20163342993410003751115Ozone
2015364347170000344487Ozone
20143623312920003350108Ozone
20133563381710003346101Ozone
20123623322910003548101Ozone
201136022113720004466122PM2.5
201036519916510004963136PM2.5
200936523612810004658119PM2.5
200836620915430004764115PM2.5
2007363218134101004770171PM2.5
200633517215481005077176Ozone
200536016118991005276154PM2.5
200434415118472005269159PM2.5
200336527974111004162151Ozone
20023653104870003754147Ozone
20013653065270003767143Ozone
20003563401150001941126PM10
199935235110000152554PM10
199834334120000153057PM10
199734134100000132146PM10

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 1997–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem