Bad Air Days in Gregg County, Texas: under 1 a Year

under 1 bad air day a year

Fewer bad air days than most monitored US counties. Ranked 757 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 April and August and June and July and September. 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 21 bad days a year; in 2016 to 2025, under 1. The air has improved. The worst recent year was 2024, with 2 bad days on 360 monitored days.

Date	AQI	Main pollutant
2023-09-02	151	Ozone
2022-07-13	143	Ozone
2024-06-14	129	Ozone
2023-08-17	126	Ozone
2024-08-07	115	Ozone

The air on a normal day

Across 3,639 monitored days from 2016 to 2025, the air in Gregg County rated Good on 91% of them, more often than the 72% typical of monitored counties, and Moderate on 9%. The median day sat at AQI 34; one day in ten went above 51.

The pollutant setting the AQI on an ordinary day here:

ozone99%3,587 days
nitrogen dioxide1%52 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	365	316	48	1	0	36	115
2024	360	322	36	2	0	37	129
2023	365	304	59	2	1	35	151
2022	365	329	35	1	0	35	143
2021	365	336	29	0	0	33	93
2020	363	357	6	0	0	31	74
2019	362	328	33	1	0	35	112
2018	364	329	35	0	0	32	97
2017	364	339	25	0	0	35	77
2016	366	336	30	0	0	36	100
2015	365	324	39	2	0	33	143
2014	365	341	22	2	0	33	115
2013	364	310	50	4	0	35	129
2012	363	296	62	5	0	36	143
2011	346	254	69	23	2	39	159
2010	364	294	60	10	0	37	133

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

Nearby counties on file

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.