Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Texas

Counties in Texas by share of days with good air quality (US EPA AQI)

Karnes County had the highest share of days with good air quality (US EPA AQI) of 45 counties in 2022, at 100%. Harris County had the lowest, at 15.6%. The median was 67.7%. Source: EPA.

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Highest100Karnes County
Lowest15.6Harris County
Median67.745 counties

Map of counties, 2022

Atascosa County: 61.2 %Bell County: 66 %Bexar County: 31.8 %Bowie County: 41.3 %Brazoria County: 85.2 %Brazos County: 72.8 %Brewster County: 74.5 %Cameron County: 52.3 %Collin County: 80.5 %Culberson County: 63.4 %Dallas County: 44.9 %Denton County: 57.3 %Ector County: 73.9 %Ellis County: 85.4 %El Paso County: 19.7 %Galveston County: 64.7 %Gregg County: 90.1 %Harris County: 15.6 %Harrison County: 50 %Hidalgo County: 54 %Hood County: 81.9 %Hunt County: 92.2 %Jefferson County: 55.6 %Johnson County: 77.6 %Karnes County: 100 %Kaufman County: 69 %Kleberg County: 56.5 %Lubbock County: 86.5 %McLennan County: 57.4 %Maverick County: 73.4 %Montgomery County: 48.1 %Navarro County: 66.5 %Nueces County: 57 %Orange County: 67.7 %Parker County: 81 %Polk County: 95.4 %Potter County: 86.9 %Randall County: 74.3 %Rockwall County: 94.2 %Smith County: 79.6 %Tarrant County: 36.2 %Travis County: 48.8 %Victoria County: 96.6 %Webb County: 59.6 %Wilson County: 100 %
  • Under 49
  • 49 to 57
  • 57 to 68
  • 68 to 78
  • 78 to 87
  • 87 and over
  • No data
%, 2022. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2022

Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Victoria County: 96.6 %Victoria County96.6Polk County: 95.4 %Polk County95.4Rockwall County: 94.2 %Rockwall County94.2Hunt County: 92.2 %Hunt County92.2Gregg County: 90.1 %Gregg County90.1Potter County: 86.9 %Potter County86.9Lubbock County: 86.5 %Lubbock County86.5Ellis County: 85.4 %Ellis County85.4Brazoria County: 85.2 %Brazoria County85.2Hood County: 81.9 %Hood County81.9Parker County: 81 %Parker County81Collin County: 80.5 %Collin County80.5Smith County: 79.6 %Smith County79.6Johnson County: 77.6 %Johnson County77.6Brewster County: 74.5 %Brewster County74.5Randall County: 74.3 %Randall County74.3Ector County: 73.9 %Ector County73.9Maverick County: 73.4 %Maverick County73.4Brazos County: 72.8 %Brazos County72.8Kaufman County: 69 %Kaufman County69Orange County: 67.7 %Orange County67.7Navarro County: 66.5 %Navarro County66.5Bell County: 66 %Bell County66Galveston County: 64.7 %Galveston County64.7Culberson County: 63.4 %Culberson County63.4Atascosa County: 61.2 %Atascosa County61.2Webb County: 59.6 %Webb County59.6McLennan County: 57.4 %McLennan County57.4Denton County: 57.3 %Denton County57.3Nueces County: 57 %Nueces County57Kleberg County: 56.5 %Kleberg County56.5Jefferson County: 55.6 %Jefferson County55.6Hidalgo County: 54 %Hidalgo County54Cameron County: 52.3 %Cameron County52.3Harrison County: 50 %Harrison County50Travis County: 48.8 %Travis County48.8Montgomery County: 48.1 %Montgomery County48.1Dallas County: 44.9 %Dallas County44.9Bowie County: 41.3 %Bowie County41.3Tarrant County: 36.2 %Tarrant County36.2Bexar County: 31.8 %Bexar County31.8El Paso County: 19.7 %El Paso County19.7Harris County: 15.6 %Harris County15.6Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Victoria County: 96.6 %Victoria County96.6Polk County: 95.4 %Polk County95.4Rockwall County: 94.2 %Rockwall County94.2Hunt County: 92.2 %Hunt County92.2Gregg County: 90.1 %Gregg County90.1Potter County: 86.9 %Potter County86.9Lubbock County: 86.5 %Lubbock County86.5Ellis County: 85.4 %Ellis County85.4Brazoria County: 85.2 %Brazoria County85.2Hood County: 81.9 %Hood County81.9Parker County: 81 %Parker County81Collin County: 80.5 %Collin County80.5Smith County: 79.6 %Smith County79.6Johnson County: 77.6 %Johnson County77.6Brewster County: 74.5 %Brewster County74.5Randall County: 74.3 %Randall County74.3Ector County: 73.9 %Ector County73.9Maverick County: 73.4 %Maverick County73.4Brazos County: 72.8 %Brazos County72.8Kaufman County: 69 %Kaufman County69Orange County: 67.7 %Orange County67.7Navarro County: 66.5 %Navarro County66.5Bell County: 66 %Bell County66Galveston County: 64.7 %Galveston County64.7Culberson County: 63.4 %Culberson County63.4Atascosa County: 61.2 %Atascosa County61.2Webb County: 59.6 %Webb County59.6McLennan County: 57.4 %McLennan County57.4Denton County: 57.3 %Denton County57.3Nueces County: 57 %Nueces County57Kleberg County: 56.5 %Kleberg County56.5Jefferson County: 55.6 %Jefferson County55.6Hidalgo County: 54 %Hidalgo County54Cameron County: 52.3 %Cameron County52.3Harrison County: 50 %Harrison County50Travis County: 48.8 %Travis County48.8Montgomery County: 48.1 %Montgomery County48.1Dallas County: 44.9 %Dallas County44.9Bowie County: 41.3 %Bowie County41.3Tarrant County: 36.2 %Tarrant County36.2Bexar County: 31.8 %Bexar County31.8El Paso County: 19.7 %El Paso County19.7Harris County: 15.6 %Harris County15.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Karnes County1000 pts
1Wilson County1000 pts
3Victoria County96.6+1.3 pts
4Polk County95.4-3.5 pts
5Rockwall County94.2-1.1 pts
6Hunt County92.2-2.6 pts
7Gregg County90.1-2 pts
8Potter County86.9+4.1 pts
9Lubbock County86.5+6.4 pts
10Ellis County85.4+13.2 pts
11Brazoria County85.2-5.5 pts
12Hood County81.9-10.8 pts
13Parker County81-7.1 pts
14Collin County80.5-1.9 pts
15Smith County79.6-12.6 pts
16Johnson County77.6-8.1 pts
17Brewster County74.5-6.1 pts
18Randall County74.3-7.1 pts
19Ector County73.9-3.2 pts
20Maverick County73.4+5.7 pts
21Brazos County72.8+3.1 pts
22Kaufman County69-4.7 pts
23Orange County67.7-4.3 pts
24Navarro County66.5-6.4 pts
25Bell County66+0.2 pts
26Galveston County64.7-7 pts
27Culberson County63.4-13.5 pts
28Atascosa County61.2+1.4 pts
29Webb County59.6+5.6 pts
30McLennan County57.4-19.5 pts
31Denton County57.3-3.5 pts
32Nueces County57+2.1 pts
33Kleberg County56.5+3.3 pts
34Jefferson County55.6-7.7 pts
35Hidalgo County54+7.4 pts
36Cameron County52.3+7.9 pts
37Harrison County50-6.6 pts
38Travis County48.8-1.1 pts
39Montgomery County48.1-8.7 pts
40Dallas County44.9-12.6 pts
41Bowie County41.3-4.4 pts
42Tarrant County36.2-7.9 pts
43Bexar County31.8+0.8 pts
44El Paso County19.7-5.2 pts
45Harris County15.6-1.9 pts

Other periods

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 18 counties with data in other periods have no value for 2022 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts (Counties in Texas by share of days with good air quality (US EPA AQI), 2022) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Texas by share of days with good air quality (US EPA AQI), 2022. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in Texas by share of days with good air quality (US EPA AQI), 2022. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Texas by share of days with good air quality (US EPA AQI), 2022 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_texas_by_2022,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Texas by share of days with good air quality (US EPA AQI), 2022}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Texas by share of days with good air quality (US EPA AQI), 2022
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2022.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Rank Counties in Texas by share of days with good air quality (US EPA AQI) using official data, and cite the source.
rank_places {"indicator":"aqi_good_days_share","level":"province","within":"Texas","limit":10}
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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Karnes County, with 100% in 2022, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Harris County, with 15.6% in 2022.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 18 counties have no value for 2022 and are not ranked.

Share of days with good air quality (US EPA AQI): other rankings

Counties in Texas: more rankings