Collier County, Florida air quality history

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

72%

Good days in 2025

Median daily AQI, 2025

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 Collier, Florida on 365 days. 263 of those days (72%) were in the Good range, and the median daily AQI was 43. That median is about the same as 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 242 days. Across the years with fuller monitoring, the share of Good days fell: an average of 96% in 2001–2003 versus 73% in 2023–2025.

Years with fewer than 120 monitored days (1995, 1996, 1997, 1998, 1999, 2000) 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.

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 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.

Pollutant	Days as main pollutant	Share of monitored days
Fine particles (PM2.5)	242	66%
Ozone	123	34%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Median AQI	90th pct.	Max AQI	Main pollutant
2025	365	263	102	0	43	55	71	PM2.5
2024	366	279	87	0	42	55	87	PM2.5
2023	360	259	100	1	43	57	144	PM2.5
2022	347	277	70	0	40	53	82	PM2.5
2021	363	278	85	0	42	55	81	PM2.5
2020	364	267	97	0	41	58	87	PM2.5
2019	362	291	71	0	40	54	90	PM2.5
2018	365	262	103	0	42	58	80	PM2.5
2017	357	270	87	0	39	56	93	PM2.5
2016	366	286	80	0	43	54	87	PM2.5
2015	363	279	84	0	39	58	77	PM2.5
2014	365	265	100	0	42	56	79	PM2.5
2013	365	264	101	0	42	57	74	PM2.5
2012	365	254	111	0	44	58	86	PM2.5
2011	365	227	136	2	44	59	110	PM2.5
2010	362	218	144	0	46	59	93	PM2.5
2009	365	253	112	0	42	58	90	PM2.5
2008	359	215	140	4	46	61	115	PM2.5
2007	364	201	161	2	47	69	137	PM2.5
2006	364	163	199	2	52	67	119	PM2.5
2005	363	200	161	2	48	62	119	PM2.5
2004	356	315	37	4	34	54	122	Ozone
2003	335	312	18	5	32	47	122	Ozone
2002	365	348	17	0	33	47	87	Ozone
2001	122	120	2	0	32	43	77	Ozone
2000	37	37	0	0	16	21	39	PM10
1999	60	60	0	0	15	20	33	PM10
1998	58	56	2	0	15	36	57	PM10
1997	58	58	0	0	16	23	43	PM10
1996	56	55	1	0	13	20	53	PM10
1995	59	58	1	0	14	22	56	PM10

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