Bad Air Days in Hamilton County, Florida: under 1 a Year

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 907 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly particles: smoke and dust (100% particle days).

Which months to watch

Most bad days here fall in June. Averaged over 2016 to 2025.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

The record for Hamilton

In 2000 to 2009 this county averaged under 1 bad days a year; in 2016 to 2025, under 1. Not much has changed. The worst recent year was 2020, with 2 bad days on 298 monitored days.

Date	AQI	Main pollutant
2020-06-26	155	PM2.5
2020-06-27	133	PM2.5
2023-10-03	89	PM2.5
2023-07-18	88	PM2.5
2017-05-30	84	PM2.5

An ordinary day in Hamilton

Across 3,156 monitored days from 2016 to 2025, the air in Hamilton County rated Good on 63% of them, less often than the 72% typical of monitored counties, and Moderate on 37%. The median day sat at AQI 45; one day in ten went above 58.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)100%3,156 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	352	212	140	0	0	46	72
2024	319	215	104	0	0	44	75
2023	318	191	127	0	0	46	89
2022	294	165	129	0	0	47	73
2021	336	207	129	0	0	46	69
2020	298	190	106	2	1	46	155
2019	316	214	102	0	0	44	81
2018	307	205	102	0	0	43	69
2017	348	213	135	0	0	45	84
2016	268	180	88	0	0	44	74
2015	317	214	103	0	0	42	80
2014	271	132	139	0	0	51	75
2013	278	166	112	0	0	45	71
2012	211	115	92	4	2	48	187
2011	361	169	189	3	0	52	140
2010	351	161	190	0	0	51	77

*2025 may be a partial year in EPA's file.

Florida compared

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.