Data / Highest daily Air Quality Index (US EPA) / Caldwell County

Highest daily Air Quality Index (US EPA) in Caldwell County

Highest daily Air Quality Index (US EPA) in Caldwell County was 67 in 2003, according to the U.S. Environmental Protection Agency. That is down 68 from 2002.

2003, index67
Change on 2002-68
Series high1352002
Series low672003

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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Highest daily Air Quality Index (US EPA) in Caldwell County, 1999 to 2003

6080100120140199920002001200220031999: 69 index2000: 71 index2001: 77 index2002: 135 index2003: 67 index60801001201401999200120031999: 69 index2000: 71 index2001: 77 index2002: 135 index2003: 67 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 5 values
Periodindex
200367
2002135
200177
200071
199969

Caldwell County compared with nearby places

Bexar County: 202 indexBowie County: 85 indexBrazoria County: 206 indexBrewster County: 90 indexCaldwell County: 67 indexCameron County: 123 indexCollin County: 201 indexCulberson County: 112 indexDallas County: 226 indexDenton County: 185 indexEctor County: 82 indexEllis County: 159 indexEl Paso County: 1,091 indexGalveston County: 238 indexGregg County: 154 indexHarris County: 226 indexHarrison County: 169 indexHays County: 154 indexHidalgo County: 150 indexHood County: 151 indexHunt County: 133 indexJeff Davis County: 77 indexJefferson County: 209 indexJohnson County: 154 indexKaufman County: 166 indexKleberg County: 81 indexLubbock County: 82 indexMcLennan County: 94 indexMontgomery County: 213 indexNueces County: 169 indexOrange County: 185 indexParker County: 185 indexPotter County: 74 indexRockwall County: 151 indexSmith County: 154 indexTarrant County: 203 indexTravis County: 177 indexVictoria County: 174 indexWebb County: 152 index
  • Under 90
  • 90 to 150
  • 150 to 180
  • 180 to 210
  • 210 and over
  • No data
Highest daily Air Quality Index (US EPA), 2003, index. Caldwell 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest daily AQI. 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/caldwell-county-texas. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/caldwell-county-texas.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/caldwell-county-texas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2003,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003}},
  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/highest-daily-air-quality-index/caldwell-county-texas. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Caldwell County, 1999 to 2003
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/highest-daily-air-quality-index/caldwell-county-texas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/caldwell-county-texas.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the highest daily Air Quality Index (US EPA) in Caldwell County?

Highest daily Air Quality Index (US EPA) in Caldwell County was 67 in 2003, according to the U.S. Environmental Protection Agency. That is down 68 from 2002.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Caldwell County?

135 in 2002, the highest value since 1999 in this series.

Related statistics for Caldwell County

All statistics for Caldwell County | Caldwell County in figures