EnviroNearby

Polk County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Polk, Florida, 1992–2025.

95%
Good days in 2025
34
Median daily AQI, 2025
0
Days above 100 in 2025
355
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Polk, Florida on 355 days. 339 of those days (95%) were in the Good range, and the median daily AQI was 34. 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 355 days. Across the years with fuller monitoring, the share of Good days fell: an average of 86% in 1992–1994 versus 83% 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%1992: Good 174 of 198 days1992: Moderate 20 of 198 days1992: Unhealthy for Sensitive Groups 2 of 198 days1992: Unhealthy 2 of 198 days19921993: Good 293 of 365 days1993: Moderate 59 of 365 days1993: Unhealthy for Sensitive Groups 10 of 365 days1993: Unhealthy 3 of 365 days1994: Good 324 of 365 days1994: Moderate 33 of 365 days1994: Unhealthy for Sensitive Groups 8 of 365 days1995: Good 314 of 365 days1995: Moderate 43 of 365 days1995: Unhealthy for Sensitive Groups 8 of 365 days1996: Good 319 of 366 days1996: Moderate 43 of 366 days1996: Unhealthy for Sensitive Groups 4 of 366 days1997: Good 310 of 365 days1997: Moderate 39 of 365 days1997: Unhealthy for Sensitive Groups 14 of 365 days1997: Unhealthy 2 of 365 days19971998: Good 277 of 365 days1998: Moderate 61 of 365 days1998: Unhealthy for Sensitive Groups 18 of 365 days1998: Unhealthy 9 of 365 days1999: Good 250 of 365 days1999: Moderate 96 of 365 days1999: Unhealthy for Sensitive Groups 19 of 365 days2000: Good 231 of 366 days2000: Moderate 110 of 366 days2000: Unhealthy for Sensitive Groups 24 of 366 days2000: Unhealthy 1 of 366 days2001: Good 255 of 365 days2001: Moderate 97 of 365 days2001: Unhealthy for Sensitive Groups 8 of 365 days2001: Unhealthy 5 of 365 days2002: Good 276 of 365 days2002: Moderate 80 of 365 days2002: Unhealthy for Sensitive Groups 9 of 365 days20022003: Good 286 of 365 days2003: Moderate 70 of 365 days2003: Unhealthy for Sensitive Groups 9 of 365 days2004: Good 256 of 365 days2004: Moderate 98 of 365 days2004: Unhealthy for Sensitive Groups 11 of 365 days2005: Good 254 of 365 days2005: Moderate 101 of 365 days2005: Unhealthy for Sensitive Groups 10 of 365 days2006: Good 247 of 365 days2006: Moderate 105 of 365 days2006: Unhealthy for Sensitive Groups 12 of 365 days2006: Unhealthy 1 of 365 days2007: Good 189 of 365 days2007: Moderate 164 of 365 days2007: Unhealthy for Sensitive Groups 12 of 365 days20072008: Good 189 of 366 days2008: Moderate 172 of 366 days2008: Unhealthy for Sensitive Groups 5 of 366 days2009: Good 217 of 365 days2009: Moderate 147 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 180 of 365 days2010: Moderate 183 of 365 days2010: Unhealthy for Sensitive Groups 2 of 365 days2011: Good 191 of 362 days2011: Moderate 168 of 362 days2011: Unhealthy for Sensitive Groups 2 of 362 days2011: Unhealthy 1 of 362 days2012: Good 201 of 366 days2012: Moderate 160 of 366 days2012: Unhealthy for Sensitive Groups 4 of 366 days2012: Unhealthy 1 of 366 days20122013: Good 242 of 365 days2013: Moderate 122 of 365 days2013: Unhealthy for Sensitive Groups 1 of 365 days2014: Good 206 of 364 days2014: Moderate 158 of 364 days2015: Good 248 of 365 days2015: Moderate 116 of 365 days2015: Unhealthy for Sensitive Groups 1 of 365 days2016: Good 251 of 366 days2016: Moderate 115 of 366 days2017: Good 217 of 365 days2017: Moderate 144 of 365 days2017: Unhealthy for Sensitive Groups 4 of 365 days20172018: Good 290 of 365 days2018: Moderate 73 of 365 days2018: Unhealthy for Sensitive Groups 2 of 365 days2019: Good 268 of 365 days2019: Moderate 97 of 365 days2020: Good 252 of 365 days2020: Moderate 113 of 365 days2021: Good 232 of 365 days2021: Moderate 133 of 365 days2022: Good 264 of 363 days2022: Moderate 99 of 363 days20222023: Good 275 of 365 days2023: Moderate 89 of 365 days2023: Unhealthy for Sensitive Groups 1 of 365 days2024: Good 282 of 365 days2024: Moderate 82 of 365 days2024: Unhealthy for Sensitive Groups 1 of 365 days2025: Good 339 of 355 days2025: Moderate 16 of 355 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 year0501001992: 90th percentile AQI 641993: 90th percentile AQI 671994: 90th percentile AQI 581995: 90th percentile AQI 611996: 90th percentile AQI 541997: 90th percentile AQI 741998: 90th percentile AQI 901999: 90th percentile AQI 802000: 90th percentile AQI 932001: 90th percentile AQI 742002: 90th percentile AQI 642003: 90th percentile AQI 602004: 90th percentile AQI 692005: 90th percentile AQI 712006: 90th percentile AQI 772007: 90th percentile AQI 742008: 90th percentile AQI 642009: 90th percentile AQI 612010: 90th percentile AQI 642011: 90th percentile AQI 662012: 90th percentile AQI 642013: 90th percentile AQI 582014: 90th percentile AQI 612015: 90th percentile AQI 582016: 90th percentile AQI 572017: 90th percentile AQI 612018: 90th percentile AQI 562019: 90th percentile AQI 582020: 90th percentile AQI 592021: 90th percentile AQI 582022: 90th percentile AQI 562023: 90th percentile AQI 582024: 90th percentile AQI 582025: 90th percentile AQI 461992: Median AQI 311993: Median AQI 361994: Median AQI 321995: Median AQI 361996: Median AQI 361997: Median AQI 371998: Median AQI 391999: Median AQI 412000: Median AQI 442001: Median AQI 412002: Median AQI 392003: Median AQI 382004: Median AQI 422005: Median AQI 412006: Median AQI 422007: Median AQI 502008: Median AQI 492009: Median AQI 472010: Median AQI 512011: Median AQI 492012: Median AQI 492013: Median AQI 432014: Median AQI 482015: Median AQI 442016: Median AQI 442017: Median AQI 472018: Median AQI 392019: Median AQI 422020: Median AQI 422021: Median AQI 452022: Median AQI 442023: Median AQI 422024: Median AQI 392025: Median AQI 3419921997200220072012201720222025
  • 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
Ozone355100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253553391600003446100Ozone
20243652828210003958105Ozone
20233652758910004258101Ozone
2022363264990000445687PM2.5
20213652321330000455884PM2.5
20203652521130000425987PM2.5
20193652689700004258100PM2.5
20183652907320003956112PM2.5
201736521714440004761143PM2.5
20163662511150000445790PM2.5
201536524811610004458105PM2.5
20143642061580000486187PM2.5
201336524212210004358105PM2.5
201236620116041004964154PM2.5
201136219116821004966151PM2.5
201036518018320005164122PM2.5
200936521714710004761105PM2.5
200836618917250004964126PM2.5
2007365189164120005074150PM2.5
2006365247105121004277159Ozone
2005365254101100004171150Ozone
200436525698110004269122Ozone
20033652867090003860147Ozone
20023652768090003964119Ozone
20013652559785004174182Ozone
2000366231110241004493165Ozone
199936525096190004180150Ozone
199836527761189003990200Ozone
199736531039142003774164Ozone
19963663194340003654136Ozone
19953653144380003661143Ozone
19943653243380003258143Ozone
199336529359103003667164Ozone
19921981742022003164161Ozone

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 1992–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem