Data / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Webb County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County was 1.4% in 2025, according to EPA. That is down 2.7 pts from 2024. That is the 16th highest of 45 counties in 2025.

20251.4%
Change on 2024-2.7 pts
Rank16th of 45Counties in Texas ranked
Series high4.12024
Series low01988

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County, 1988 to 2025

01234519881994200020062012201820251988: 0 %1989: 0 %1990: 0 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0.9 %1998: 0.8 %1999: 0 %2000: 1.1 %2001: 0.3 %2002: 0.5 %2003: 0.8 %2004: 0 %2005: 0.8 %2006: 1.1 %2007: 0 %2008: 0.8 %2009: 0 %2010: 0 %2011: 0.9 %2012: 0.3 %2013: 0.8 %2014: 0 %2015: 0 %2016: 0 %2017: 0 %2018: 0.6 %2019: 0.3 %2020: 0.8 %2021: 0 %2022: 0.6 %2023: 1.4 %2024: 4.1 %2025: 1.4 %024619882001201420251988: 0 %1989: 0 %1990: 0 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %1996: 0 %1997: 0.9 %1998: 0.8 %1999: 0 %2000: 1.1 %2001: 0.3 %2002: 0.5 %2003: 0.8 %2004: 0 %2005: 0.8 %2006: 1.1 %2007: 0 %2008: 0.8 %2009: 0 %2010: 0 %2011: 0.9 %2012: 0.3 %2013: 0.8 %2014: 0 %2015: 0 %2016: 0 %2017: 0 %2018: 0.6 %2019: 0.3 %2020: 0.8 %2021: 0 %2022: 0.6 %2023: 1.4 %2024: 4.1 %2025: 1.4 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 38 values
Period%
20251.4
20244.1
20231.4
20220.6
20210
20200.8
20190.3
20180.6
20170
20160
20150
20140
20130.8
20120.3
20110.9
20100
20090
20080.8
20070
20061.1
20050.8
20040
20030.8
20020.5
20010.3
20001.1
19990
19980.8
19970.9
19960
19950
19940
19930
19920
19910
19900
19890
19880

Webb County compared with nearby places

Atascosa County: 0 %Bell County: 1.1 %Bexar County: 3 %Bowie County: 0.3 %Brazoria County: 2.2 %Brazos County: 0 %Brewster County: 0.3 %Cameron County: 2.2 %Collin County: 6.4 %Culberson County: 2.3 %Dallas County: 3 %Denton County: 5.2 %Ector County: 0.6 %Ellis County: 0 %El Paso County: 17.3 %Galveston County: 2.2 %Gregg County: 0.3 %Harris County: 10.4 %Harrison County: 0 %Hidalgo County: 1.1 %Hood County: 1.1 %Hunt County: 0.3 %Jefferson County: 0.8 %Johnson County: 0.3 %Karnes County: 0 %Kaufman County: 0.5 %Kleberg County: 0.8 %Lubbock County: 0.6 %McLennan County: 0.8 %Maverick County: 0 %Montgomery County: 2.2 %Navarro County: 0.3 %Nueces County: 2.2 %Orange County: 0 %Parker County: 2.6 %Polk County: 0.3 %Potter County: 0 %Randall County: 0 %Rockwall County: 0.7 %Smith County: 0 %Tarrant County: 8.2 %Travis County: 1.6 %Victoria County: 0 %Webb County: 1.4 %Wilson County: 0 %
  • Under 0.3
  • 0.3 to 0.7
  • 0.7 to 1.5
  • 1.5 to 2.5
  • 2.5 and over
  • No data
Share of days unhealthy for sensitive groups or worse (US EPA AQI), 2025, %. Webb County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

Days with a daily Air Quality Index above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) 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; the counts are stored with each value.

Use the share rather than the number of days to compare counties, since the days with an AQI differ. 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.

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How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/webb-county-texas. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/webb-county-texas.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/unhealthy-air-quality-days-share/webb-county-texas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_unhealthy_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 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/en/unhealthy-air-quality-days-share/webb-county-texas. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Webb County, 1988 to 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/en/unhealthy-air-quality-days-share/webb-county-texas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/webb-county-texas.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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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Questions

What is the share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County?

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County was 1.4% in 2025, according to EPA. That is down 2.7 pts from 2024. That is the 16th highest of 45 counties in 2025.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Retrieved by Invokely on 2026-10-12.

What was the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) in Webb County?

4.1% in 2024, the highest value since 1988 in this series.

Related statistics for Webb County

All statistics for Webb County | Webb County in figures