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

Counties in Arkansas by share of days with good air quality (US EPA AQI)

Montgomery County had the highest share of days with good air quality (US EPA AQI) of 21 counties in 2000, at 85.2%. Ashley County had the lowest, at 8.9%. The median was 21.9%. Source: EPA.

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Highest85.2Montgomery County
Lowest8.9Ashley County
Median21.921 counties

Map of counties, 2000

Arkansas County: 20.8 %Ashley County: 8.9 %Clark County: 76.4 %Craighead County: 12.3 %Crittenden County: 60.9 %Faulkner County: 20 %Garland County: 26.4 %Jefferson County: 12.3 %Marion County: 44.9 %Miller County: 9.5 %Mississippi County: 20 %Montgomery County: 85.2 %Newton County: 66.7 %Phillips County: 23.2 %Polk County: 28.8 %Pope County: 21.9 %Pulaski County: 13.9 %Sebastian County: 20 %Union County: 19.6 %Washington County: 30.2 %White County: 23.5 %
  • Under 14
  • 14 to 20
  • 20 to 24
  • 24 to 45
  • 45 and over
  • No data
%, 2000. 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, 2000

Montgomery County: 85.2 %Montgomery County85.2Clark County: 76.4 %Clark County76.4Newton County: 66.7 %Newton County66.7Crittenden County: 60.9 %Crittenden County60.9Marion County: 44.9 %Marion County44.9Washington County: 30.2 %Washington County30.2Polk County: 28.8 %Polk County28.8Garland County: 26.4 %Garland County26.4White County: 23.5 %White County23.5Phillips County: 23.2 %Phillips County23.2Pope County: 21.9 %Pope County21.9Arkansas County: 20.8 %Arkansas County20.8Faulkner County: 20 %Faulkner County20Mississippi County: 20 %Mississippi County20Sebastian County: 20 %Sebastian County20Union County: 19.6 %Union County19.6Pulaski County: 13.9 %Pulaski County13.9Craighead County: 12.3 %Craighead County12.3Jefferson County: 12.3 %Jefferson County12.3Miller County: 9.5 %Miller County9.5Ashley County: 8.9 %Ashley County8.9Montgomery County: 85.2 %Montgomery County85.2Clark County: 76.4 %Clark County76.4Newton County: 66.7 %Newton County66.7Crittenden County: 60.9 %Crittenden County60.9Marion County: 44.9 %Marion County44.9Washington County: 30.2 %Washington County30.2Polk County: 28.8 %Polk County28.8Garland County: 26.4 %Garland County26.4White County: 23.5 %White County23.5Phillips County: 23.2 %Phillips County23.2Pope County: 21.9 %Pope County21.9Arkansas County: 20.8 %Arkansas County20.8Faulkner County: 20 %Faulkner County20Mississippi County: 20 %Mississippi County20Sebastian County: 20 %Sebastian County20Union County: 19.6 %Union County19.6Pulaski County: 13.9 %Pulaski County13.9Craighead County: 12.3 %Craighead County12.3Jefferson County: 12.3 %Jefferson County12.3Miller County: 9.5 %Miller County9.5Ashley County: 8.9 %Ashley County8.9
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2000 (%)Change on 1999
1Montgomery County85.2-0.7 pts
2Clark County76.4+8.7 pts
3Newton County66.7+7.5 pts
4Crittenden County60.9+0.1 pts
5Marion County44.9+4.9 pts
6Washington County30.2-1.6 pts
7Polk County28.8-17 pts
8Garland County26.4-6.9 pts
9White County23.5n/a
10Phillips County23.2-4.1 pts
11Pope County21.9-3.1 pts
12Arkansas County20.8+2.9 pts
13Faulkner County20n/a
13Mississippi County20n/a
13Sebastian County20-1.8 pts
16Union County19.6+3.6 pts
17Pulaski County13.9-37.1 pts
18Craighead County12.3+1.2 pts
18Jefferson County12.3-23.7 pts
20Miller County9.5-8.7 pts
21Ashley County8.9+5.3 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. 5 counties with data in other periods have no value for 2000 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 Arkansas by share of days with good air quality (US EPA AQI), 2000) [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 Arkansas by share of days with good air quality (US EPA AQI), 2000. 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/arkansas-counties?period=2000. 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 Arkansas by share of days with good air quality (US EPA AQI), 2000. 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/arkansas-counties?period=2000.

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 Arkansas by share of days with good air quality (US EPA AQI), 2000 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=2000 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_arkansas_by_2000,
  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 Arkansas by share of days with good air quality (US EPA AQI), 2000}},
  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/arkansas-counties?period=2000. 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 Arkansas by share of days with good air quality (US EPA AQI), 2000
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/arkansas-counties?period=2000
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=2000.
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 Arkansas 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)?

Montgomery County, with 85.2% in 2000, according to EPA.

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

Ashley County, with 8.9% in 2000.

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. 5 counties have no value for 2000 and are not ranked.

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

Counties in Arkansas: more rankings