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

under 1 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 846 of 996 monitored counties, where 1 is worst.

What makes them bad: a mix of particles and ozone (50% particle days).

Which months to watch

Most bad days here fall in March and May and June and October. 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 Martin

The worst recent year was 2017, with 1 bad day on 352 monitored days.

Date	AQI	Main pollutant
2023-10-03	127	PM2.5
2017-05-11	115	Ozone
2018-03-16	112	Ozone
2022-06-15	108	PM2.5
2020-09-04	96	PM2.5

An ordinary day in Martin

Across 3,605 monitored days from 2016 to 2025, the air in Martin County rated Good on 78% of them, more often than the 72% typical of monitored counties, and Moderate on 22%. The median day sat at AQI 41; one day in ten went above 55.

The pollutant setting the AQI on an ordinary day here:

fine particles (PM2.5)64%2,314 days
ozone36%1,291 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2025*	365	290	75	0	40	74
2024	357	309	48	0	39	71
2023	365	283	81	1	41	127
2022	356	280	75	1	42	108
2021	365	251	114	0	44	88
2020	365	275	90	0	42	96
2019	352	288	64	0	41	85
2018	365	285	79	1	42	112
2017	352	258	93	1	42	115
2016	363	280	83	0	41	87
2015	365	281	84	0	39	78
2014	363	276	86	1	41	101
2013	352	269	83	0	39	79
2012	365	225	139	1	46	122
2011	363	226	137	0	46	100
2010	204	123	81	0	46	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, and on why a purifier does not touch ozone in smoke vs ozone.