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), 2025

Karnes County had the highest share of days with good air quality (US EPA AQI) of 45 counties in 2025, at 100%. Harris County had the lowest, at 11%. The median was 66%. Source: EPA.

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Highest100Karnes County
Lowest11Harris County
Median6645 counties

Map of counties, 2025

Atascosa County: 76 %Bell County: 66 %Bexar County: 43.3 %Bowie County: 55 %Brazoria County: 80.8 %Brazos County: 68.5 %Brewster County: 74.7 %Cameron County: 29.9 %Collin County: 75.8 %Culberson County: 76.1 %Dallas County: 40.5 %Denton County: 57.8 %Ector County: 72.3 %Ellis County: 89.2 %El Paso County: 18.1 %Galveston County: 59.7 %Gregg County: 86.6 %Harris County: 11 %Harrison County: 64.4 %Hidalgo County: 44.4 %Hood County: 83.4 %Hunt County: 91.7 %Jefferson County: 47.9 %Johnson County: 85.5 %Karnes County: 100 %Kaufman County: 66 %Kleberg County: 51.7 %Lubbock County: 92.9 %McLennan County: 46.6 %Maverick County: 63 %Montgomery County: 39.1 %Navarro County: 59.2 %Nueces County: 40.5 %Orange County: 60.2 %Parker County: 81.8 %Polk County: 94.8 %Potter County: 94.1 %Randall County: 82.8 %Rockwall County: 96.8 %Smith County: 90.4 %Tarrant County: 31.8 %Travis County: 43.6 %Victoria County: 86.7 %Webb County: 49.9 %Wilson County: 100 %
  • Under 43
  • 43 to 57
  • 57 to 66
  • 66 to 81
  • 81 to 90
  • 90 and over
  • No data
%, 2025. 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, 2025

Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Rockwall County: 96.8 %Rockwall County96.8Polk County: 94.8 %Polk County94.8Potter County: 94.1 %Potter County94.1Lubbock County: 92.9 %Lubbock County92.9Hunt County: 91.7 %Hunt County91.7Smith County: 90.4 %Smith County90.4Ellis County: 89.2 %Ellis County89.2Victoria County: 86.7 %Victoria County86.7Gregg County: 86.6 %Gregg County86.6Johnson County: 85.5 %Johnson County85.5Hood County: 83.4 %Hood County83.4Randall County: 82.8 %Randall County82.8Parker County: 81.8 %Parker County81.8Brazoria County: 80.8 %Brazoria County80.8Culberson County: 76.1 %Culberson County76.1Atascosa County: 76 %Atascosa County76Collin County: 75.8 %Collin County75.8Brewster County: 74.7 %Brewster County74.7Ector County: 72.3 %Ector County72.3Brazos County: 68.5 %Brazos County68.5Bell County: 66 %Bell County66Kaufman County: 66 %Kaufman County66Harrison County: 64.4 %Harrison County64.4Maverick County: 63 %Maverick County63Orange County: 60.2 %Orange County60.2Galveston County: 59.7 %Galveston County59.7Navarro County: 59.2 %Navarro County59.2Denton County: 57.8 %Denton County57.8Bowie County: 55 %Bowie County55Kleberg County: 51.7 %Kleberg County51.7Webb County: 49.9 %Webb County49.9Jefferson County: 47.9 %Jefferson County47.9McLennan County: 46.6 %McLennan County46.6Hidalgo County: 44.4 %Hidalgo County44.4Travis County: 43.6 %Travis County43.6Bexar County: 43.3 %Bexar County43.3Dallas County: 40.5 %Dallas County40.5Nueces County: 40.5 %Nueces County40.5Montgomery County: 39.1 %Montgomery County39.1Tarrant County: 31.8 %Tarrant County31.8Cameron County: 29.9 %Cameron County29.9El Paso County: 18.1 %El Paso County18.1Harris County: 11 %Harris County11Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Rockwall County: 96.8 %Rockwall County96.8Polk County: 94.8 %Polk County94.8Potter County: 94.1 %Potter County94.1Lubbock County: 92.9 %Lubbock County92.9Hunt County: 91.7 %Hunt County91.7Smith County: 90.4 %Smith County90.4Ellis County: 89.2 %Ellis County89.2Victoria County: 86.7 %Victoria County86.7Gregg County: 86.6 %Gregg County86.6Johnson County: 85.5 %Johnson County85.5Hood County: 83.4 %Hood County83.4Randall County: 82.8 %Randall County82.8Parker County: 81.8 %Parker County81.8Brazoria County: 80.8 %Brazoria County80.8Culberson County: 76.1 %Culberson County76.1Atascosa County: 76 %Atascosa County76Collin County: 75.8 %Collin County75.8Brewster County: 74.7 %Brewster County74.7Ector County: 72.3 %Ector County72.3Brazos County: 68.5 %Brazos County68.5Bell County: 66 %Bell County66Kaufman County: 66 %Kaufman County66Harrison County: 64.4 %Harrison County64.4Maverick County: 63 %Maverick County63Orange County: 60.2 %Orange County60.2Galveston County: 59.7 %Galveston County59.7Navarro County: 59.2 %Navarro County59.2Denton County: 57.8 %Denton County57.8Bowie County: 55 %Bowie County55Kleberg County: 51.7 %Kleberg County51.7Webb County: 49.9 %Webb County49.9Jefferson County: 47.9 %Jefferson County47.9McLennan County: 46.6 %McLennan County46.6Hidalgo County: 44.4 %Hidalgo County44.4Travis County: 43.6 %Travis County43.6Bexar County: 43.3 %Bexar County43.3Dallas County: 40.5 %Dallas County40.5Nueces County: 40.5 %Nueces County40.5Montgomery County: 39.1 %Montgomery County39.1Tarrant County: 31.8 %Tarrant County31.8Cameron County: 29.9 %Cameron County29.9El Paso County: 18.1 %El Paso County18.1Harris County: 11 %Harris County11
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Karnes County1000 pts
1Wilson County1000 pts
3Rockwall County96.8+4.2 pts
4Polk County94.8-1.8 pts
5Potter County94.1+6.6 pts
6Lubbock County92.9+0.7 pts
7Hunt County91.7+2.2 pts
8Smith County90.4+3.9 pts
9Ellis County89.20 pts
10Victoria County86.7-4.6 pts
11Gregg County86.6-2.8 pts
12Johnson County85.5+3.8 pts
13Hood County83.4+3.7 pts
14Randall County82.8+4.2 pts
15Parker County81.8-3.9 pts
16Brazoria County80.8-2.2 pts
17Culberson County76.1-13.1 pts
18Atascosa County76+18.9 pts
19Collin County75.8-1.7 pts
20Brewster County74.7+4.1 pts
21Ector County72.3-6.4 pts
22Brazos County68.5+2.8 pts
23Bell County66+4.3 pts
23Kaufman County66+3.6 pts
25Harrison County64.4+0.6 pts
26Maverick County63-5.3 pts
27Orange County60.2-4.8 pts
28Galveston County59.7-8 pts
29Navarro County59.2+3.2 pts
30Denton County57.8+0.4 pts
31Bowie County55+2.5 pts
32Kleberg County51.7-6.8 pts
33Webb County49.9-7.8 pts
34Jefferson County47.9+10.5 pts
35McLennan County46.6+12.1 pts
36Hidalgo County44.4+3.4 pts
37Travis County43.6+1 pts
38Bexar County43.3-4.2 pts
39Dallas County40.5+5.3 pts
39Nueces County40.5-8.1 pts
41Montgomery County39.1+8.5 pts
42Tarrant County31.8-3.7 pts
43Cameron County29.9+2.9 pts
44El Paso County18.1-4 pts
45Harris County11-2.7 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 2025 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), 2025) [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), 2025. 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. 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), 2025. 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.

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), 2025 [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 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_texas_by_2025,
  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), 2025}},
  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. 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), 2025
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties.
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 2025, according to EPA.

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

Harris County, with 11% in 2025.

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 2025 and are not ranked.

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

Counties in Texas: more rankings