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 2024, at 100%. Harris County had the lowest, at 13.7%. The median was 65.7%. Source: EPA.

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Highest100Karnes County
Lowest13.7Harris County
Median65.745 counties

Map of counties, 2024

Atascosa County: 57.1 %Bell County: 61.7 %Bexar County: 47.5 %Bowie County: 52.5 %Brazoria County: 83 %Brazos County: 65.7 %Brewster County: 70.6 %Cameron County: 27 %Collin County: 77.5 %Culberson County: 89.2 %Dallas County: 35.2 %Denton County: 57.4 %Ector County: 78.7 %Ellis County: 89.2 %El Paso County: 22.1 %Galveston County: 67.7 %Gregg County: 89.4 %Harris County: 13.7 %Harrison County: 63.8 %Hidalgo County: 41 %Hood County: 79.7 %Hunt County: 89.5 %Jefferson County: 37.4 %Johnson County: 81.7 %Karnes County: 100 %Kaufman County: 62.4 %Kleberg County: 58.5 %Lubbock County: 92.2 %McLennan County: 34.5 %Maverick County: 68.3 %Montgomery County: 30.6 %Navarro County: 56 %Nueces County: 48.6 %Orange County: 65 %Parker County: 85.7 %Polk County: 96.6 %Potter County: 87.5 %Randall County: 78.6 %Rockwall County: 92.6 %Smith County: 86.5 %Tarrant County: 35.5 %Travis County: 42.6 %Victoria County: 91.3 %Webb County: 57.7 %Wilson County: 100 %
  • Under 39
  • 39 to 57
  • 57 to 66
  • 66 to 80
  • 80 to 89
  • 89 and over
  • No data
%, 2024. 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, 2024

Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Polk County: 96.6 %Polk County96.6Rockwall County: 92.6 %Rockwall County92.6Lubbock County: 92.2 %Lubbock County92.2Victoria County: 91.3 %Victoria County91.3Hunt County: 89.5 %Hunt County89.5Gregg County: 89.4 %Gregg County89.4Culberson County: 89.2 %Culberson County89.2Ellis County: 89.2 %Ellis County89.2Potter County: 87.5 %Potter County87.5Smith County: 86.5 %Smith County86.5Parker County: 85.7 %Parker County85.7Brazoria County: 83 %Brazoria County83Johnson County: 81.7 %Johnson County81.7Hood County: 79.7 %Hood County79.7Ector County: 78.7 %Ector County78.7Randall County: 78.6 %Randall County78.6Collin County: 77.5 %Collin County77.5Brewster County: 70.6 %Brewster County70.6Maverick County: 68.3 %Maverick County68.3Galveston County: 67.7 %Galveston County67.7Brazos County: 65.7 %Brazos County65.7Orange County: 65 %Orange County65Harrison County: 63.8 %Harrison County63.8Kaufman County: 62.4 %Kaufman County62.4Bell County: 61.7 %Bell County61.7Kleberg County: 58.5 %Kleberg County58.5Webb County: 57.7 %Webb County57.7Denton County: 57.4 %Denton County57.4Atascosa County: 57.1 %Atascosa County57.1Navarro County: 56 %Navarro County56Bowie County: 52.5 %Bowie County52.5Nueces County: 48.6 %Nueces County48.6Bexar County: 47.5 %Bexar County47.5Travis County: 42.6 %Travis County42.6Hidalgo County: 41 %Hidalgo County41Jefferson County: 37.4 %Jefferson County37.4Tarrant County: 35.5 %Tarrant County35.5Dallas County: 35.2 %Dallas County35.2McLennan County: 34.5 %McLennan County34.5Montgomery County: 30.6 %Montgomery County30.6Cameron County: 27 %Cameron County27El Paso County: 22.1 %El Paso County22.1Harris County: 13.7 %Harris County13.7Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Polk County: 96.6 %Polk County96.6Rockwall County: 92.6 %Rockwall County92.6Lubbock County: 92.2 %Lubbock County92.2Victoria County: 91.3 %Victoria County91.3Hunt County: 89.5 %Hunt County89.5Gregg County: 89.4 %Gregg County89.4Culberson County: 89.2 %Culberson County89.2Ellis County: 89.2 %Ellis County89.2Potter County: 87.5 %Potter County87.5Smith County: 86.5 %Smith County86.5Parker County: 85.7 %Parker County85.7Brazoria County: 83 %Brazoria County83Johnson County: 81.7 %Johnson County81.7Hood County: 79.7 %Hood County79.7Ector County: 78.7 %Ector County78.7Randall County: 78.6 %Randall County78.6Collin County: 77.5 %Collin County77.5Brewster County: 70.6 %Brewster County70.6Maverick County: 68.3 %Maverick County68.3Galveston County: 67.7 %Galveston County67.7Brazos County: 65.7 %Brazos County65.7Orange County: 65 %Orange County65Harrison County: 63.8 %Harrison County63.8Kaufman County: 62.4 %Kaufman County62.4Bell County: 61.7 %Bell County61.7Kleberg County: 58.5 %Kleberg County58.5Webb County: 57.7 %Webb County57.7Denton County: 57.4 %Denton County57.4Atascosa County: 57.1 %Atascosa County57.1Navarro County: 56 %Navarro County56Bowie County: 52.5 %Bowie County52.5Nueces County: 48.6 %Nueces County48.6Bexar County: 47.5 %Bexar County47.5Travis County: 42.6 %Travis County42.6Hidalgo County: 41 %Hidalgo County41Jefferson County: 37.4 %Jefferson County37.4Tarrant County: 35.5 %Tarrant County35.5Dallas County: 35.2 %Dallas County35.2McLennan County: 34.5 %McLennan County34.5Montgomery County: 30.6 %Montgomery County30.6Cameron County: 27 %Cameron County27El Paso County: 22.1 %El Paso County22.1Harris County: 13.7 %Harris County13.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Karnes County1000 pts
1Wilson County1000 pts
3Polk County96.6+5.6 pts
4Rockwall County92.6-1 pts
5Lubbock County92.2+3.5 pts
6Victoria County91.3-5.6 pts
7Hunt County89.5+2 pts
8Gregg County89.4+6.1 pts
9Culberson County89.2-5.2 pts
9Ellis County89.2+7 pts
11Potter County87.5-0.8 pts
12Smith County86.5+5.2 pts
13Parker County85.7+1.6 pts
14Brazoria County83+0.5 pts
15Johnson County81.7+3.5 pts
16Hood County79.7-0.4 pts
17Ector County78.7-1.6 pts
18Randall County78.6+4.2 pts
19Collin County77.5+4.2 pts
20Brewster County70.6-2.4 pts
21Maverick County68.3-4.1 pts
22Galveston County67.7+18.8 pts
23Brazos County65.7-1.3 pts
24Orange County65+6.6 pts
25Harrison County63.8+6.1 pts
26Kaufman County62.4+1.4 pts
27Bell County61.7-1.6 pts
28Kleberg County58.5+0.7 pts
29Webb County57.7-4.5 pts
30Denton County57.4+2.6 pts
31Atascosa County57.1-6.5 pts
32Navarro County56-3.6 pts
33Bowie County52.5+12 pts
34Nueces County48.6-5.1 pts
35Bexar County47.5+2.6 pts
36Travis County42.6+2.3 pts
37Hidalgo County41-16.7 pts
38Jefferson County37.4-1 pts
39Tarrant County35.5+8.4 pts
40Dallas County35.2+1.8 pts
41McLennan County34.5-11.8 pts
42Montgomery County30.6-10.9 pts
43Cameron County27-17.1 pts
44El Paso County22.1+3.2 pts
45Harris County13.7+1.6 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 2024 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), 2024) [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), 2024. 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=2024. 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), 2024. 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=2024.

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), 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_texas_by_2024,
  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), 2024}},
  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=2024. 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), 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2024.
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.
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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 2024, according to EPA.

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

Harris County, with 13.7% in 2024.

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 2024 and are not ranked.

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

Counties in Texas: more rankings