EnviroNearby

Pasco County, Florida air quality history

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

93%
Good days in 2025
37
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 Pasco, Florida on 365 days. 338 of those days (93%) were in the Good range, and the median daily AQI was 37. 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 365 days. Across the years with fuller monitoring, the share of Good days rose: an average of 81% in 1992–1994 versus 90% 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 272 of 341 days1992: Moderate 65 of 341 days1992: Unhealthy for Sensitive Groups 4 of 341 days19921993: Good 266 of 347 days1993: Moderate 72 of 347 days1993: Unhealthy for Sensitive Groups 9 of 347 days1994: Good 309 of 357 days1994: Moderate 39 of 357 days1994: Unhealthy for Sensitive Groups 9 of 357 days1995: Good 291 of 352 days1995: Moderate 53 of 352 days1995: Unhealthy for Sensitive Groups 8 of 352 days1996: Good 301 of 365 days1996: Moderate 59 of 365 days1996: Unhealthy for Sensitive Groups 5 of 365 days1997: Good 271 of 364 days1997: Moderate 75 of 364 days1997: Unhealthy for Sensitive Groups 18 of 364 days19971998: Good 267 of 365 days1998: Moderate 78 of 365 days1998: Unhealthy for Sensitive Groups 15 of 365 days1998: Unhealthy 5 of 365 days1999: Good 268 of 365 days1999: Moderate 77 of 365 days1999: Unhealthy for Sensitive Groups 17 of 365 days1999: Unhealthy 3 of 365 days2000: Good 249 of 362 days2000: Moderate 94 of 362 days2000: Unhealthy for Sensitive Groups 18 of 362 days2000: Unhealthy 1 of 362 days2001: Good 281 of 365 days2001: Moderate 65 of 365 days2001: Unhealthy for Sensitive Groups 18 of 365 days2001: Unhealthy 1 of 365 days2002: Good 299 of 365 days2002: Moderate 59 of 365 days2002: Unhealthy for Sensitive Groups 7 of 365 days20022003: Good 299 of 365 days2003: Moderate 46 of 365 days2003: Unhealthy for Sensitive Groups 19 of 365 days2003: Unhealthy 1 of 365 days2004: Good 279 of 364 days2004: Moderate 76 of 364 days2004: Unhealthy for Sensitive Groups 9 of 364 days2005: Good 274 of 365 days2005: Moderate 75 of 365 days2005: Unhealthy for Sensitive Groups 16 of 365 days2006: Good 266 of 365 days2006: Moderate 85 of 365 days2006: Unhealthy for Sensitive Groups 13 of 365 days2006: Unhealthy 1 of 365 days2007: Good 273 of 362 days2007: Moderate 80 of 362 days2007: Unhealthy for Sensitive Groups 9 of 362 days20072008: Good 309 of 366 days2008: Moderate 50 of 366 days2008: Unhealthy for Sensitive Groups 7 of 366 days2009: Good 322 of 365 days2009: Moderate 42 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 304 of 365 days2010: Moderate 61 of 365 days2011: Good 308 of 364 days2011: Moderate 52 of 364 days2011: Unhealthy for Sensitive Groups 4 of 364 days2012: Good 325 of 366 days2012: Moderate 41 of 366 days20122013: Good 336 of 365 days2013: Moderate 28 of 365 days2013: Unhealthy for Sensitive Groups 1 of 365 days2014: Good 331 of 365 days2014: Moderate 33 of 365 days2014: Unhealthy for Sensitive Groups 1 of 365 days2015: Good 343 of 365 days2015: Moderate 22 of 365 days2016: Good 328 of 366 days2016: Moderate 37 of 366 days2016: Unhealthy for Sensitive Groups 1 of 366 days2017: Good 312 of 348 days2017: Moderate 34 of 348 days2017: Unhealthy for Sensitive Groups 2 of 348 days20172018: Good 324 of 365 days2018: Moderate 39 of 365 days2018: Unhealthy for Sensitive Groups 2 of 365 days2019: Good 336 of 365 days2019: Moderate 29 of 365 days2020: Good 355 of 366 days2020: Moderate 11 of 366 days2021: Good 346 of 365 days2021: Moderate 19 of 365 days2022: Good 332 of 361 days2022: Moderate 29 of 361 days20222023: Good 323 of 365 days2023: Moderate 42 of 365 days2024: Good 320 of 354 days2024: Moderate 34 of 354 days2025: Good 338 of 365 days2025: Moderate 26 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 year0501001992: 90th percentile AQI 671993: 90th percentile AQI 741994: 90th percentile AQI 611995: 90th percentile AQI 671996: 90th percentile AQI 671997: 90th percentile AQI 901998: 90th percentile AQI 871999: 90th percentile AQI 802000: 90th percentile AQI 902001: 90th percentile AQI 842002: 90th percentile AQI 642003: 90th percentile AQI 672004: 90th percentile AQI 742005: 90th percentile AQI 802006: 90th percentile AQI 772007: 90th percentile AQI 742008: 90th percentile AQI 612009: 90th percentile AQI 512010: 90th percentile AQI 582011: 90th percentile AQI 642012: 90th percentile AQI 512013: 90th percentile AQI 492014: 90th percentile AQI 502015: 90th percentile AQI 472016: 90th percentile AQI 512017: 90th percentile AQI 512018: 90th percentile AQI 542019: 90th percentile AQI 492020: 90th percentile AQI 462021: 90th percentile AQI 472022: 90th percentile AQI 502023: 90th percentile AQI 512024: 90th percentile AQI 502025: 90th percentile AQI 491992: Median AQI 371993: Median AQI 411994: Median AQI 341995: Median AQI 391996: Median AQI 391997: Median AQI 411998: Median AQI 411999: Median AQI 412000: Median AQI 432001: Median AQI 412002: Median AQI 412003: Median AQI 392004: Median AQI 422005: Median AQI 412006: Median AQI 422007: Median AQI 412008: Median AQI 382009: Median AQI 382010: Median AQI 392011: Median AQI 382012: Median AQI 382013: Median AQI 362014: Median AQI 352015: Median AQI 372016: Median AQI 372017: Median AQI 372018: Median AQI 352019: Median AQI 362020: Median AQI 352021: Median AQI 352022: Median AQI 372023: Median AQI 392024: Median AQI 392025: Median AQI 3719921997200220072012201720222025
  • 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
Ozone365100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653382610003749115Ozone
2024354320340000395097Ozone
2023365323420000395197Ozone
2022361332290000375087Ozone
2021365346190000354787Ozone
2020366355110000354677Ozone
2019365336290000364997Ozone
20183653243920003554129Ozone
20173483123420003751112Ozone
20163663283710003751105Ozone
2015365343220000374790Ozone
20143653313310003550108Ozone
20133653362810003649101Ozone
20123663254100003851100Ozone
20113643085240003864108Ozone
2010365304610000395897Ozone
20093653224210003851101Ozone
20083663095070003861143Ozone
20073622738090004174136Ozone
200636526685131004277161Ozone
200536527475160004180140Ozone
20043642797690004274140Ozone
200336529946191003967159Ozone
20023652995970004164126Ozone
200136528165181004184161Ozone
200036224994181004390159Ozone
199936526877173004180177Ozone
199836526778155004187185Ozone
199736427175180004190147Ozone
19963653015950003967126Ozone
19953522915380003967122Ozone
19943573093990003461147Ozone
19933472667290004174133Ozone
19923412726540003767150Ozone

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