EnviroNearby

St. Lucie County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in St. Lucie, Florida, 1995–2025.

96%
Good days in 2025
34
Median daily AQI, 2025
0
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for St. Lucie, Florida on 364 days. 351 of those days (96%) 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 364 days. Across the years with fuller monitoring, the share of Good days rose: an average of 91% in 1996–1998 versus 97% in 2023–2025.

Years with fewer than 120 monitored days (1995) 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%1995: Good 86 of 92 days1995: Moderate 6 of 92 days19951996: Good 347 of 364 days1996: Moderate 17 of 364 days1997: Good 336 of 362 days1997: Moderate 24 of 362 days1997: Unhealthy for Sensitive Groups 2 of 362 days1998: Good 303 of 361 days1998: Moderate 43 of 361 days1998: Unhealthy for Sensitive Groups 14 of 361 days1998: Unhealthy 1 of 361 days1999: Good 266 of 360 days1999: Moderate 90 of 360 days1999: Unhealthy for Sensitive Groups 4 of 360 days2000: Good 269 of 361 days2000: Moderate 87 of 361 days2000: Unhealthy for Sensitive Groups 5 of 361 days20002001: Good 294 of 364 days2001: Moderate 64 of 364 days2001: Unhealthy for Sensitive Groups 4 of 364 days2001: Unhealthy 2 of 364 days2002: Good 313 of 365 days2002: Moderate 51 of 365 days2002: Unhealthy for Sensitive Groups 1 of 365 days2003: Good 311 of 365 days2003: Moderate 52 of 365 days2003: Unhealthy for Sensitive Groups 2 of 365 days2004: Good 267 of 335 days2004: Moderate 63 of 335 days2004: Unhealthy for Sensitive Groups 5 of 335 days2005: Good 213 of 352 days2005: Moderate 136 of 352 days2005: Unhealthy for Sensitive Groups 3 of 352 days20052006: Good 155 of 364 days2006: Moderate 208 of 364 days2006: Unhealthy for Sensitive Groups 1 of 364 days2007: Good 207 of 363 days2007: Moderate 155 of 363 days2007: Unhealthy for Sensitive Groups 1 of 363 days2008: Good 202 of 366 days2008: Moderate 163 of 366 days2008: Unhealthy for Sensitive Groups 1 of 366 days2009: Good 234 of 365 days2009: Moderate 131 of 365 days2010: Good 134 of 223 days2010: Moderate 89 of 223 days20102011: Good 281 of 310 days2011: Moderate 29 of 310 days2012: Good 330 of 359 days2012: Moderate 28 of 359 days2012: Unhealthy for Sensitive Groups 1 of 359 days2014: Good 343 of 360 days2014: Moderate 16 of 360 days2014: Unhealthy for Sensitive Groups 1 of 360 days2015: Good 341 of 350 days2015: Moderate 9 of 350 days2016: Good 309 of 329 days2016: Moderate 20 of 329 days20162017: Good 319 of 339 days2017: Moderate 19 of 339 days2017: Unhealthy for Sensitive Groups 1 of 339 days2018: Good 342 of 360 days2018: Moderate 18 of 360 days2019: Good 342 of 352 days2019: Moderate 10 of 352 days2020: Good 351 of 360 days2020: Moderate 9 of 360 days2021: Good 353 of 363 days2021: Moderate 10 of 363 days20212022: Good 352 of 358 days2022: Moderate 6 of 358 days2023: Good 352 of 361 days2023: Moderate 9 of 361 days2024: Good 353 of 362 days2024: Moderate 9 of 362 days2025: Good 351 of 364 days2025: Moderate 13 of 364 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 year0501001995: 90th percentile AQI 471996: 90th percentile AQI 471997: 90th percentile AQI 491998: 90th percentile AQI 671999: 90th percentile AQI 632000: 90th percentile AQI 672001: 90th percentile AQI 582002: 90th percentile AQI 532003: 90th percentile AQI 542004: 90th percentile AQI 592005: 90th percentile AQI 672006: 90th percentile AQI 672007: 90th percentile AQI 632008: 90th percentile AQI 612009: 90th percentile AQI 592010: 90th percentile AQI 582011: 90th percentile AQI 502012: 90th percentile AQI 482014: 90th percentile AQI 482015: 90th percentile AQI 442016: 90th percentile AQI 482017: 90th percentile AQI 482018: 90th percentile AQI 472019: 90th percentile AQI 462020: 90th percentile AQI 442021: 90th percentile AQI 452022: 90th percentile AQI 442023: 90th percentile AQI 452024: 90th percentile AQI 452025: 90th percentile AQI 461995: Median AQI 281996: Median AQI 321997: Median AQI 321998: Median AQI 341999: Median AQI 392000: Median AQI 402001: Median AQI 362002: Median AQI 352003: Median AQI 362004: Median AQI 372005: Median AQI 452006: Median AQI 522007: Median AQI 472008: Median AQI 482009: Median AQI 462010: Median AQI 472011: Median AQI 352012: Median AQI 362014: Median AQI 342015: Median AQI 322016: Median AQI 372017: Median AQI 352018: Median AQI 332019: Median AQI 342020: Median AQI 332021: Median AQI 332022: Median AQI 332023: Median AQI 352024: Median AQI 352025: Median AQI 341995200020052010201620212025
  • 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
Ozone364100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025364351130000344667Ozone
202436235390000354564Ozone
202336135290000354580Ozone
202235835260000334477Ozone
2021363353100000334574Ozone
202036035190000334474Ozone
2019352342100000344677Ozone
20183603421800003347100Ozone
20173393191910003548112Ozone
2016329309200000374893Ozone
201535034190000324484Ozone
20143603431610003448122Ozone
20123593302810003648101Ozone
20113102812900003550100Ozone
2010223134890000475893PM2.5
20093652341310000465985PM2.5
200836620216310004861105PM2.5
200736320715510004763104PM2.5
200636415520810005267112PM2.5
200535221313630004567121PM2.5
20043352676350003759126Ozone
20033653115220003654101Ozone
20023653135110003553115Ozone
20013642946442003658164Ozone
20003612698750004067115Ozone
19993602669040003963133Ozone
199836130343141003467156Ozone
19973623362420003249108Ozone
1996364347170000324793Ozone
1995928660000284780Ozone

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 1995–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem