Bad Air Days in Martin County, North Carolina: 0 a Year

0 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 973 of 996 monitored counties, where 1 is worst.

What to buy, and what not to

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.

Better or worse than it was

In 2000 to 2009 this county averaged 15 bad days a year; in 2016 to 2025, 0. The air has improved.

Date	AQI	Main pollutant
2016-04-19	97	Ozone
2016-06-12	87	Ozone
2018-05-02	80	Ozone
2018-07-11	80	Ozone
2022-06-05	80	Ozone

An ordinary day in Martin

Across 2,704 monitored days from 2016 to 2025, the air in Martin County rated Good on 96% of them, more often than the 72% typical of monitored counties, and Moderate on 4%. The median day sat at AQI 34; one day in ten went above 46.

The pollutant setting the AQI on an ordinary day here:

ozone87%2,356 days
coarse dust (PM10)13%348 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	289	289	0	0	0	31	50
2024	305	304	1	0	0	31	61
2023	244	230	14	0	0	36	77
2022	289	282	7	0	0	34	80
2021	296	291	5	0	0	32	74
2020	240	240	0	0	0	33	49
2019	295	261	34	0	0	40	74
2018	289	261	28	0	0	34	80
2017	244	231	13	0	0	38	74
2016	213	200	13	0	0	36	97
2015	351	252	99	0	0	44	71
2014	359	189	170	0	0	49	97
2013	362	178	184	0	0	51	90
2012	358	237	120	1	0	43	140
2011	345	205	137	3	1	46	180
2010	357	201	153	3	0	48	133

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

Elsewhere in North Carolina

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.