Bad Air Days in Mayes County, Oklahoma: under 1 a Year

under 1 bad air day a year

Rare: among the cleanest-air counties EPA monitors. Ranked 765 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (0% particle days).

The bad-air season here

Most bad days here fall in June and March and July and August. Averaged over 2016 to 2025.

Is a purifier worth it 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 worst days on file

In 2000 to 2009 this county averaged 8 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2023, with 2 bad days on 285 monitored days.

Date	AQI	Main pollutant
2018-07-20	140	Ozone
2023-06-08	129	Ozone
2022-03-03	112	Ozone
2024-08-06	112	Ozone
2023-06-09	105	Ozone

An ordinary day in Mayes

Across 2,769 monitored days from 2016 to 2025, the air in Mayes County rated Good on 92% of them, more often than the 72% typical of monitored counties, and Moderate on 8%. The median day sat at AQI 38; one day in ten went above 49.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,769 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	285	260	25	0	0	37	87
2024	290	261	28	1	0	40	112
2023	285	255	28	2	0	42	129
2022	266	246	19	1	0	39	112
2021	248	228	20	0	0	37	100
2020	258	255	3	0	0	34	51
2019	297	283	14	0	0	35	100
2018	261	228	32	1	0	37	140
2017	285	261	24	0	0	38	71
2016	294	264	30	0	0	38	93
2015	284	262	21	1	0	38	108
2014	286	262	24	0	0	37	74
2013	275	229	44	2	0	40	112
2012	275	181	68	26	3	44	166
2011	266	154	92	20	2	46	166
2010	285	176	108	1	0	45	101

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

Elsewhere in Oklahoma

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.