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 2023, at 100%. Harris County had the lowest, at 12.1%. The median was 63.6%. Source: EPA.

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Highest100Karnes County
Lowest12.1Harris County
Median63.645 counties

Map of counties, 2023

Atascosa County: 63.6 %Bell County: 63.3 %Bexar County: 44.9 %Bowie County: 40.5 %Brazoria County: 82.5 %Brazos County: 67 %Brewster County: 73 %Cameron County: 44.1 %Collin County: 73.3 %Culberson County: 94.4 %Dallas County: 33.4 %Denton County: 54.8 %Ector County: 80.3 %Ellis County: 82.2 %El Paso County: 18.9 %Galveston County: 48.9 %Gregg County: 83.3 %Harris County: 12.1 %Harrison County: 57.7 %Hidalgo County: 57.7 %Hood County: 80.1 %Hunt County: 87.5 %Jefferson County: 38.4 %Johnson County: 78.2 %Karnes County: 100 %Kaufman County: 61 %Kleberg County: 57.8 %Lubbock County: 88.7 %McLennan County: 46.3 %Maverick County: 72.4 %Montgomery County: 41.5 %Navarro County: 59.6 %Nueces County: 53.7 %Orange County: 58.4 %Parker County: 84.1 %Polk County: 91 %Potter County: 88.3 %Randall County: 74.4 %Rockwall County: 93.6 %Smith County: 81.3 %Tarrant County: 27.1 %Travis County: 40.3 %Victoria County: 96.9 %Webb County: 62.2 %Wilson County: 100 %
  • Under 42
  • 42 to 58
  • 58 to 64
  • 64 to 80
  • 80 to 88
  • 88 and over
  • No data
%, 2023. 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, 2023

Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Victoria County: 96.9 %Victoria County96.9Culberson County: 94.4 %Culberson County94.4Rockwall County: 93.6 %Rockwall County93.6Polk County: 91 %Polk County91Lubbock County: 88.7 %Lubbock County88.7Potter County: 88.3 %Potter County88.3Hunt County: 87.5 %Hunt County87.5Parker County: 84.1 %Parker County84.1Gregg County: 83.3 %Gregg County83.3Brazoria County: 82.5 %Brazoria County82.5Ellis County: 82.2 %Ellis County82.2Smith County: 81.3 %Smith County81.3Ector County: 80.3 %Ector County80.3Hood County: 80.1 %Hood County80.1Johnson County: 78.2 %Johnson County78.2Randall County: 74.4 %Randall County74.4Collin County: 73.3 %Collin County73.3Brewster County: 73 %Brewster County73Maverick County: 72.4 %Maverick County72.4Brazos County: 67 %Brazos County67Atascosa County: 63.6 %Atascosa County63.6Bell County: 63.3 %Bell County63.3Webb County: 62.2 %Webb County62.2Kaufman County: 61 %Kaufman County61Navarro County: 59.6 %Navarro County59.6Orange County: 58.4 %Orange County58.4Kleberg County: 57.8 %Kleberg County57.8Harrison County: 57.7 %Harrison County57.7Hidalgo County: 57.7 %Hidalgo County57.7Denton County: 54.8 %Denton County54.8Nueces County: 53.7 %Nueces County53.7Galveston County: 48.9 %Galveston County48.9McLennan County: 46.3 %McLennan County46.3Bexar County: 44.9 %Bexar County44.9Cameron County: 44.1 %Cameron County44.1Montgomery County: 41.5 %Montgomery County41.5Bowie County: 40.5 %Bowie County40.5Travis County: 40.3 %Travis County40.3Jefferson County: 38.4 %Jefferson County38.4Dallas County: 33.4 %Dallas County33.4Tarrant County: 27.1 %Tarrant County27.1El Paso County: 18.9 %El Paso County18.9Harris County: 12.1 %Harris County12.1Karnes County: 100 %Karnes County100Wilson County: 100 %Wilson County100Victoria County: 96.9 %Victoria County96.9Culberson County: 94.4 %Culberson County94.4Rockwall County: 93.6 %Rockwall County93.6Polk County: 91 %Polk County91Lubbock County: 88.7 %Lubbock County88.7Potter County: 88.3 %Potter County88.3Hunt County: 87.5 %Hunt County87.5Parker County: 84.1 %Parker County84.1Gregg County: 83.3 %Gregg County83.3Brazoria County: 82.5 %Brazoria County82.5Ellis County: 82.2 %Ellis County82.2Smith County: 81.3 %Smith County81.3Ector County: 80.3 %Ector County80.3Hood County: 80.1 %Hood County80.1Johnson County: 78.2 %Johnson County78.2Randall County: 74.4 %Randall County74.4Collin County: 73.3 %Collin County73.3Brewster County: 73 %Brewster County73Maverick County: 72.4 %Maverick County72.4Brazos County: 67 %Brazos County67Atascosa County: 63.6 %Atascosa County63.6Bell County: 63.3 %Bell County63.3Webb County: 62.2 %Webb County62.2Kaufman County: 61 %Kaufman County61Navarro County: 59.6 %Navarro County59.6Orange County: 58.4 %Orange County58.4Kleberg County: 57.8 %Kleberg County57.8Harrison County: 57.7 %Harrison County57.7Hidalgo County: 57.7 %Hidalgo County57.7Denton County: 54.8 %Denton County54.8Nueces County: 53.7 %Nueces County53.7Galveston County: 48.9 %Galveston County48.9McLennan County: 46.3 %McLennan County46.3Bexar County: 44.9 %Bexar County44.9Cameron County: 44.1 %Cameron County44.1Montgomery County: 41.5 %Montgomery County41.5Bowie County: 40.5 %Bowie County40.5Travis County: 40.3 %Travis County40.3Jefferson County: 38.4 %Jefferson County38.4Dallas County: 33.4 %Dallas County33.4Tarrant County: 27.1 %Tarrant County27.1El Paso County: 18.9 %El Paso County18.9Harris County: 12.1 %Harris County12.1
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Karnes County1000 pts
1Wilson County1000 pts
3Victoria County96.9+0.3 pts
4Culberson County94.4+31 pts
5Rockwall County93.6-0.6 pts
6Polk County91-4.4 pts
7Lubbock County88.7+2.2 pts
8Potter County88.3+1.4 pts
9Hunt County87.5-4.7 pts
10Parker County84.1+3.1 pts
11Gregg County83.3-6.8 pts
12Brazoria County82.5-2.7 pts
13Ellis County82.2-3.2 pts
14Smith County81.3+1.7 pts
15Ector County80.3+6.4 pts
16Hood County80.1-1.8 pts
17Johnson County78.2+0.6 pts
18Randall County74.4+0.1 pts
19Collin County73.3-7.2 pts
20Brewster County73-1.5 pts
21Maverick County72.4-1 pts
22Brazos County67-5.8 pts
23Atascosa County63.6+2.4 pts
24Bell County63.3-2.7 pts
25Webb County62.2+2.6 pts
26Kaufman County61-8 pts
27Navarro County59.6-6.9 pts
28Orange County58.4-9.3 pts
29Kleberg County57.8+1.3 pts
30Harrison County57.7+7.7 pts
30Hidalgo County57.7+3.7 pts
32Denton County54.8-2.5 pts
33Nueces County53.7-3.3 pts
34Galveston County48.9-15.8 pts
35McLennan County46.3-11.1 pts
36Bexar County44.9+13.1 pts
37Cameron County44.1-8.2 pts
38Montgomery County41.5-6.6 pts
39Bowie County40.5-0.8 pts
40Travis County40.3-8.5 pts
41Jefferson County38.4-17.2 pts
42Dallas County33.4-11.5 pts
43Tarrant County27.1-9.1 pts
44El Paso County18.9-0.8 pts
45Harris County12.1-3.5 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 2023 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), 2023) [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), 2023. 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=2023. 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), 2023. 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=2023.

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), 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_texas_by_2023,
  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), 2023}},
  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=2023. 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), 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2023.
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 2023, according to EPA.

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

Harris County, with 12.1% in 2023.

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 2023 and are not ranked.

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

Counties in Texas: more rankings