Data / Median Air Quality Index (US EPA) / Thomas County

Median Air Quality Index (US EPA) in Thomas County

Median Air Quality Index (US EPA) in Thomas County was 22 in 2025, according to the U.S. Environmental Protection Agency. That is up 10 from 2024.

2025, index22
Change on 2024+10
Series high252007
Series low122024

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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Median Air Quality Index (US EPA) in Thomas County, 2002 to 2025

101520252002200620102014201820252002: 14 index2003: 22 index2004: 21 index2005: 20 index2006: 18 index2007: 25 index2008: 16 index2009: 19 index2010: 22 index2011: 21 index2012: 24 index2013: 19 index2014: 18 index2015: 19 index2016: 14 index2017: 16 index2018: 21 index2019: 16 index2020: 14 index2021: 19 index2022: 17 index2024: 12 index2025: 22 index1015202520022010201820252002: 14 index2003: 22 index2004: 21 index2005: 20 index2006: 18 index2007: 25 index2008: 16 index2009: 19 index2010: 22 index2011: 21 index2012: 24 index2013: 19 index2014: 18 index2015: 19 index2016: 14 index2017: 16 index2018: 21 index2019: 16 index2020: 14 index2021: 19 index2022: 17 index2024: 12 index2025: 22 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 23 values
Periodindex
202522
202412
202217
202119
202014
201916
201821
201716
201614
201519
201418
201319
201224
201121
201022
200919
200816
200725
200618
200520
200421
200322
200214

Thomas County compared with nearby places

Cass County: 19 indexDouglas County: 42 indexGage County: 34 indexHall County: 34 indexKnox County: 36 indexLancaster County: 37 indexSarpy County: 32 indexScotts Bluff County: 23 indexSioux County: 42 indexThomas County: 22 indexWashington County: 27 index
  • Under 23
  • 23 to 32
  • 32 to 34
  • 34 to 37
  • 37 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Thomas 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

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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: median 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: median daily AQI (Median Air Quality Index (US EPA), Thomas County, 2002 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: median daily AQI, Median Air Quality Index (US EPA), Thomas County, 2002 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/median-air-quality-index/thomas-county-nebraska. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Thomas County, 2002 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/median-air-quality-index/thomas-county-nebraska.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Thomas County, 2002 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/thomas-county-nebraska (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Thomas County, 2002 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/median-air-quality-index/thomas-county-nebraska. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median 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: median daily AQI: Median Air Quality Index (US EPA), Thomas County, 2002 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/median-air-quality-index/thomas-county-nebraska
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/thomas-county-nebraska.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median 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 median Air Quality Index (US EPA) in Thomas County?

Median Air Quality Index (US EPA) in Thomas County was 22 in 2025, according to the U.S. Environmental Protection Agency. That is up 10 from 2024.

Where does this figure come from?

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

What was the highest median Air Quality Index (US EPA) in Thomas County?

25 in 2007, the highest value since 2002 in this series.

Related statistics for Thomas County

All statistics for Thomas County | Thomas County in figures