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)

Wichita County had the highest share of days with good air quality (US EPA AQI) of 43 counties in 2014, at 95.9%. Harris County had the lowest, at 18.6%. The median was 64.9%. Source: EPA.

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Highest95.9Wichita County
Lowest18.6Harris County
Median64.943 counties

Map of counties, 2014

Bell County: 83.8 %Bexar County: 35.3 %Bowie County: 47.9 %Brazoria County: 90.4 %Brewster County: 80.4 %Cameron County: 47.4 %Collin County: 82.8 %Culberson County: 86.9 %Dallas County: 39.7 %Denton County: 54.2 %Ector County: 63.8 %Ellis County: 52.9 %El Paso County: 30.1 %Fayette County: 67.9 %Galveston County: 67.7 %Gregg County: 93.4 %Harris County: 18.6 %Harrison County: 65.2 %Hidalgo County: 55.6 %Hood County: 86.3 %Hunt County: 93.4 %Jefferson County: 49.3 %Johnson County: 85 %Kaufman County: 64.9 %Kleberg County: 62.1 %Lubbock County: 71.3 %McLennan County: 64.7 %Maverick County: 52.5 %Montgomery County: 51 %Navarro County: 59.1 %Nueces County: 56.7 %Orange County: 63.6 %Parker County: 84.2 %Polk County: 95.8 %Potter County: 83.1 %Randall County: 82.2 %Rockwall County: 87.2 %Smith County: 90.1 %Tarrant County: 49 %Travis County: 48.2 %Victoria County: 95 %Webb County: 45.2 %Wichita County: 95.9 %
  • Under 48
  • 48 to 56
  • 56 to 65
  • 65 to 83
  • 83 to 87
  • 87 and over
  • No data
%, 2014. 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, 2014

Wichita County: 95.9 %Wichita County95.9Polk County: 95.8 %Polk County95.8Victoria County: 95 %Victoria County95Gregg County: 93.4 %Gregg County93.4Hunt County: 93.4 %Hunt County93.4Brazoria County: 90.4 %Brazoria County90.4Smith County: 90.1 %Smith County90.1Rockwall County: 87.2 %Rockwall County87.2Culberson County: 86.9 %Culberson County86.9Hood County: 86.3 %Hood County86.3Johnson County: 85 %Johnson County85Parker County: 84.2 %Parker County84.2Bell County: 83.8 %Bell County83.8Potter County: 83.1 %Potter County83.1Collin County: 82.8 %Collin County82.8Randall County: 82.2 %Randall County82.2Brewster County: 80.4 %Brewster County80.4Lubbock County: 71.3 %Lubbock County71.3Fayette County: 67.9 %Fayette County67.9Galveston County: 67.7 %Galveston County67.7Harrison County: 65.2 %Harrison County65.2Kaufman County: 64.9 %Kaufman County64.9McLennan County: 64.7 %McLennan County64.7Ector County: 63.8 %Ector County63.8Orange County: 63.6 %Orange County63.6Kleberg County: 62.1 %Kleberg County62.1Navarro County: 59.1 %Navarro County59.1Nueces County: 56.7 %Nueces County56.7Hidalgo County: 55.6 %Hidalgo County55.6Denton County: 54.2 %Denton County54.2Ellis County: 52.9 %Ellis County52.9Maverick County: 52.5 %Maverick County52.5Montgomery County: 51 %Montgomery County51Jefferson County: 49.3 %Jefferson County49.3Tarrant County: 49 %Tarrant County49Travis County: 48.2 %Travis County48.2Bowie County: 47.9 %Bowie County47.9Cameron County: 47.4 %Cameron County47.4Webb County: 45.2 %Webb County45.2Dallas County: 39.7 %Dallas County39.7Bexar County: 35.3 %Bexar County35.3El Paso County: 30.1 %El Paso County30.1Harris County: 18.6 %Harris County18.6Wichita County: 95.9 %Wichita County95.9Polk County: 95.8 %Polk County95.8Victoria County: 95 %Victoria County95Gregg County: 93.4 %Gregg County93.4Hunt County: 93.4 %Hunt County93.4Brazoria County: 90.4 %Brazoria County90.4Smith County: 90.1 %Smith County90.1Rockwall County: 87.2 %Rockwall County87.2Culberson County: 86.9 %Culberson County86.9Hood County: 86.3 %Hood County86.3Johnson County: 85 %Johnson County85Parker County: 84.2 %Parker County84.2Bell County: 83.8 %Bell County83.8Potter County: 83.1 %Potter County83.1Collin County: 82.8 %Collin County82.8Randall County: 82.2 %Randall County82.2Brewster County: 80.4 %Brewster County80.4Lubbock County: 71.3 %Lubbock County71.3Fayette County: 67.9 %Fayette County67.9Galveston County: 67.7 %Galveston County67.7Harrison County: 65.2 %Harrison County65.2Kaufman County: 64.9 %Kaufman County64.9McLennan County: 64.7 %McLennan County64.7Ector County: 63.8 %Ector County63.8Orange County: 63.6 %Orange County63.6Kleberg County: 62.1 %Kleberg County62.1Navarro County: 59.1 %Navarro County59.1Nueces County: 56.7 %Nueces County56.7Hidalgo County: 55.6 %Hidalgo County55.6Denton County: 54.2 %Denton County54.2Ellis County: 52.9 %Ellis County52.9Maverick County: 52.5 %Maverick County52.5Montgomery County: 51 %Montgomery County51Jefferson County: 49.3 %Jefferson County49.3Tarrant County: 49 %Tarrant County49Travis County: 48.2 %Travis County48.2Bowie County: 47.9 %Bowie County47.9Cameron County: 47.4 %Cameron County47.4Webb County: 45.2 %Webb County45.2Dallas County: 39.7 %Dallas County39.7Bexar County: 35.3 %Bexar County35.3El Paso County: 30.1 %El Paso County30.1Harris County: 18.6 %Harris County18.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Wichita County95.9+17.6 pts
2Polk County95.8+3.9 pts
3Victoria County95-0.2 pts
4Gregg County93.4+8.2 pts
4Hunt County93.4+7.6 pts
6Brazoria County90.4+3.8 pts
7Smith County90.1+4.4 pts
8Rockwall County87.2+4.1 pts
9Culberson County86.9+2.7 pts
10Hood County86.3+3.5 pts
11Johnson County85+2.9 pts
12Parker County84.2+1.9 pts
13Bell County83.8+2.6 pts
14Potter County83.1-5.2 pts
15Collin County82.8+6.3 pts
16Randall County82.2+6.4 pts
17Brewster County80.4+6.5 pts
18Lubbock County71.3-5.6 pts
19Fayette County67.9-2.5 pts
20Galveston County67.7-5.9 pts
21Harrison County65.2+6.8 pts
22Kaufman County64.9+5.7 pts
23McLennan County64.7+0.2 pts
24Ector County63.8-5.8 pts
25Orange County63.6-0.2 pts
26Kleberg County62.1-4.4 pts
27Navarro County59.1+2.4 pts
28Nueces County56.7-3 pts
29Hidalgo County55.6-5.8 pts
30Denton County54.2+1 pts
31Ellis County52.9+1.7 pts
32Maverick County52.5-19.3 pts
33Montgomery County51-2.4 pts
34Jefferson County49.3+5.5 pts
35Tarrant County49+10.4 pts
36Travis County48.2-4.1 pts
37Bowie County47.9-3 pts
38Cameron County47.4-6.3 pts
39Webb County45.2-12.1 pts
40Dallas County39.7+17.8 pts
41Bexar County35.3-5.5 pts
42El Paso County30.1+3.5 pts
43Harris County18.6-2.8 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. 20 counties with data in other periods have no value for 2014 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), 2014) [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), 2014. 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=2014. 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), 2014. 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=2014.

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), 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_texas_by_2014,
  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), 2014}},
  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=2014. 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), 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/texas-counties?period=2014.
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)?

Wichita County, with 95.9% in 2014, according to EPA.

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

Harris County, with 18.6% in 2014.

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. 20 counties have no value for 2014 and are not ranked.

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

Counties in Texas: more rankings