Data / Rankings / Share of days with good air quality (US EPA AQI) / Counties in Nebraska

Counties in Nebraska by share of days with good air quality (US EPA AQI), 2008

Garden County had the highest share of days with good air quality (US EPA AQI) of 13 counties in 2008, at 97.5%. Douglas County had the lowest, at 9%. The median was 78.1%. Source: EPA.

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Highest97.5Garden County
Lowest9Douglas County
Median78.113 counties

Map of counties, 2008

Cass County: 90 %Dawson County: 96.6 %Douglas County: 9 %Garden County: 97.5 %Hall County: 67.9 %Knox County: 95.3 %Lancaster County: 88.5 %Sarpy County: 51.9 %Scotts Bluff County: 78.1 %Sioux County: 51.6 %Thomas County: 95.5 %Thurston County: 74.5 %Washington County: 63.1 %
  • Under 56
  • 56 to 73
  • 73 to 89
  • 89 to 95
  • 95 and over
  • No data
%, 2008. 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, 2008

Garden County: 97.5 %Garden County97.5Dawson County: 96.6 %Dawson County96.6Thomas County: 95.5 %Thomas County95.5Knox County: 95.3 %Knox County95.3Cass County: 90 %Cass County90Lancaster County: 88.5 %Lancaster County88.5Scotts Bluff County: 78.1 %Scotts Bluff County78.1Thurston County: 74.5 %Thurston County74.5Hall County: 67.9 %Hall County67.9Washington County: 63.1 %Washington County63.1Sarpy County: 51.9 %Sarpy County51.9Sioux County: 51.6 %Sioux County51.6Douglas County: 9 %Douglas County9Garden County: 97.5 %Garden County97.5Dawson County: 96.6 %Dawson County96.6Thomas County: 95.5 %Thomas County95.5Knox County: 95.3 %Knox County95.3Cass County: 90 %Cass County90Lancaster County: 88.5 %Lancaster County88.5Scotts Bluff County: 78.1 %Scotts Bluff County78.1Thurston County: 74.5 %Thurston County74.5Hall County: 67.9 %Hall County67.9Washington County: 63.1 %Washington County63.1Sarpy County: 51.9 %Sarpy County51.9Sioux County: 51.6 %Sioux County51.6Douglas County: 9 %Douglas County9
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2008 (%)Change on 2007
1Garden County97.5+1.7 pts
2Dawson County96.6+8.9 pts
3Thomas County95.5+2.2 pts
4Knox County95.3-4.7 pts
5Cass County90+1.5 pts
6Lancaster County88.5-0.5 pts
7Scotts Bluff County78.1-0.4 pts
8Thurston County74.5+7.8 pts
9Hall County67.9+1.2 pts
10Washington County63.1+0.9 pts
11Sarpy County51.9-6.5 pts
12Sioux County51.6-2.2 pts
13Douglas County9-12.4 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. 11 counties with data in other periods have no value for 2008 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 Nebraska by share of days with good air quality (US EPA AQI), 2008) [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 Nebraska by share of days with good air quality (US EPA AQI), 2008. 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/nebraska-counties. 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 Nebraska by share of days with good air quality (US EPA AQI), 2008. 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/nebraska-counties.

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 Nebraska by share of days with good air quality (US EPA AQI), 2008 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/nebraska-counties (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_nebraska_by_2008,
  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 Nebraska by share of days with good air quality (US EPA AQI), 2008}},
  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/nebraska-counties. 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 Nebraska by share of days with good air quality (US EPA AQI), 2008
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/nebraska-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/nebraska-counties.
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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Questions

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

Garden County, with 97.5% in 2008, according to EPA.

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

Douglas County, with 9% in 2008.

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. 11 counties have no value for 2008 and are not ranked.

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

Counties in Nebraska: more rankings