Hamilton County, Florida air quality history

Daily Air Quality Index summaries from EPA monitors in Hamilton, Florida, 1993–2025.

60%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

352

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Hamilton, Florida on 352 days. 212 of those days (60%) were in the Good range, and the median daily AQI was 46. That median is higher than 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 352 days. Across the years with fuller monitoring, the share of Good days fell: an average of 100% in 2002–2004 versus 63% in 2023–2025.

Years with fewer than 120 monitored days (1996, 1997, 1998, 1999, 2000, 2001…) 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)	352	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Very Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	352	212	140	0	0	0	46	57	72	PM2.5
2024	319	215	104	0	0	0	44	58	75	PM2.5
2023	318	191	127	0	0	0	46	60	89	PM2.5
2022	294	165	129	0	0	0	47	58	73	PM2.5
2021	336	207	129	0	0	0	46	57	69	PM2.5
2020	298	190	106	1	1	0	46	58	155	PM2.5
2019	316	214	102	0	0	0	44	58	81	PM2.5
2018	307	205	102	0	0	0	43	56	69	PM2.5
2017	348	213	135	0	0	0	45	60	84	PM2.5
2016	268	180	88	0	0	0	44	57	74	PM2.5
2015	317	214	103	0	0	0	42	61	80	PM2.5
2014	271	132	139	0	0	0	51	61	75	PM2.5
2013	278	166	112	0	0	0	45	60	71	PM2.5
2012	211	115	92	2	2	0	48	61	187	PM2.5
2011	361	169	189	3	0	0	52	66	140	PM2.5
2010	351	161	190	0	0	0	51	62	77	PM2.5
2009	340	172	168	0	0	0	50	61	78	PM2.5
2008	360	145	215	0	0	0	53	63	79	PM2.5
2007	336	184	149	0	2	1	47	66	212	PM2.5
2006	316	315	1	0	0	0	17	27	51	PM10
2005	359	351	8	0	0	0	15	29	83	PM10
2004	307	307	0	0	0	0	16	25	47	PM10
2003	362	362	0	0	0	0	15	23	45	PM10
2002	336	335	1	0	0	0	14	22	59	PM10
2001	108	106	1	1	0	0	16	28	132	PM10
2000	59	58	1	0	0	0	18	28	100	PM10
1999	58	57	0	1	0	0	20	32	103	PM10
1998	50	49	0	0	1	0	20	35	184	PM10
1997	55	55	0	0	0	0	19	31	40	PM10
1996	57	54	3	0	0	0	20	35	63	PM10
1995	58	58	0	0	0	0	19	36	49	PM10
1994	56	56	0	0	0	0	19	29	42	PM10
1993	50	48	2	0	0	0	21	36	98	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 1993–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem