Bad Air Days in Parker County, Texas: 5 a Year

5 bad air days a year

More bad air days than three quarters of monitored counties. Ranked 234 of 996 monitored counties, where 1 is worst.

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

When the bad days come in Parker

Most bad days here fall in August and October and September. Averaged over 2016 to 2025.

Is a purifier worth it here?

Ozone drives many bad days here. Purifiers and filters do not remove ozone, so do not buy one for that. Ozone peaks on hot afternoons: exercise outside in the morning.

The record for Parker

In 2000 to 2009 this county averaged 22 bad days a year; in 2016 to 2025, 5. The air has improved. The worst recent year was 2022, with 14 bad days on 358 monitored days.

Date	AQI	Main pollutant
2018-08-22	164	Ozone
2016-06-07	156	Ozone
2024-09-10	156	Ozone
2022-06-29	147	Ozone
2025-10-02	147	Ozone

Most days, not the worst ones

Across 3,574 monitored days from 2016 to 2025, the air in Parker County rated Good on 87% of them, more often than the 72% typical of monitored counties, and Moderate on 12%. The median day sat at AQI 37; one day in ten went above 56.

The pollutant setting the AQI on an ordinary day here:

ozone100%3,574 days

Parker County by year

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	346	283	54	9	0	38	147
2024	349	299	44	6	1	36	156
2023	358	301	50	7	0	39	140
2022	358	290	54	14	0	40	147
2021	354	312	41	1	0	36	136
2020	362	331	30	1	0	35	115
2019	363	317	46	0	0	37	100
2018	359	319	34	6	1	35	164
2017	360	327	32	1	0	37	112
2016	365	333	31	1	1	37	156
2015	365	301	47	17	0	37	133
2014	354	298	49	7	0	37	126
2013	339	279	50	10	0	38	140
2012	363	287	67	9	2	40	166
2011	363	256	78	29	5	43	182
2010	364	324	38	2	1	38	164

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

Texas 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.