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)

Garland County had the highest share of days with good air quality (US EPA AQI) of 21 counties in 1991, at 100%. Mississippi County had the lowest, at 28.6%. The median was 98.3%. Source: EPA.

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Highest100Garland County
Lowest28.6Mississippi County
Median98.321 counties

Map of counties, 1991

Arkansas County: 94.9 %Ashley County: 94.8 %Clark County: 82.6 %Craighead County: 96.6 %Crittenden County: 76.1 %Garland County: 100 %Jefferson County: 100 %Marion County: 100 %Miller County: 100 %Mississippi County: 28.6 %Montgomery County: 100 %Newton County: 75 %Ouachita County: 98.2 %Phillips County: 100 %Polk County: 100 %Pope County: 100 %Pulaski County: 77.5 %Sebastian County: 99.2 %Union County: 98.3 %Washington County: 100 %White County: 98.3 %
  • Under 83
  • 83 to 98
  • 98 to 100
  • 100 and over
  • No data
%, 1991. 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, 1991

Garland County: 100 %Garland County100Jefferson County: 100 %Jefferson County100Marion County: 100 %Marion County100Miller County: 100 %Miller County100Montgomery County: 100 %Montgomery County100Phillips County: 100 %Phillips County100Polk County: 100 %Polk County100Pope County: 100 %Pope County100Washington County: 100 %Washington County100Sebastian County: 99.2 %Sebastian County99.2Union County: 98.3 %Union County98.3White County: 98.3 %White County98.3Ouachita County: 98.2 %Ouachita County98.2Craighead County: 96.6 %Craighead County96.6Arkansas County: 94.9 %Arkansas County94.9Ashley County: 94.8 %Ashley County94.8Clark County: 82.6 %Clark County82.6Pulaski County: 77.5 %Pulaski County77.5Crittenden County: 76.1 %Crittenden County76.1Newton County: 75 %Newton County75Mississippi County: 28.6 %Mississippi County28.6Garland County: 100 %Garland County100Jefferson County: 100 %Jefferson County100Marion County: 100 %Marion County100Miller County: 100 %Miller County100Montgomery County: 100 %Montgomery County100Phillips County: 100 %Phillips County100Polk County: 100 %Polk County100Pope County: 100 %Pope County100Washington County: 100 %Washington County100Sebastian County: 99.2 %Sebastian County99.2Union County: 98.3 %Union County98.3White County: 98.3 %White County98.3Ouachita County: 98.2 %Ouachita County98.2Craighead County: 96.6 %Craighead County96.6Arkansas County: 94.9 %Arkansas County94.9Ashley County: 94.8 %Ashley County94.8Clark County: 82.6 %Clark County82.6Pulaski County: 77.5 %Pulaski County77.5Crittenden County: 76.1 %Crittenden County76.1Newton County: 75 %Newton County75Mississippi County: 28.6 %Mississippi County28.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1991 (%)Change on 1990
1Garland County1000 pts
1Jefferson County100+1.8 pts
1Marion County1000 pts
1Miller County1000 pts
1Montgomery County100n/a
1Phillips County100+1.8 pts
1Polk County1000 pts
1Pope County1000 pts
1Washington County100+3.4 pts
10Sebastian County99.2+2.7 pts
11Union County98.3-1.7 pts
11White County98.3+1.6 pts
13Ouachita County98.2-1.8 pts
14Craighead County96.60 pts
15Arkansas County94.9-1.8 pts
16Ashley County94.8+1.4 pts
17Clark County82.6+3.4 pts
18Pulaski County77.5+3.5 pts
19Crittenden County76.1-15.2 pts
20Newton County75n/a
21Mississippi County28.6-60.8 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 1991 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), 1991) [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), 1991. 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=1991. 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), 1991. 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=1991.

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), 1991 [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=1991 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_arkansas_by_1991,
  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), 1991}},
  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=1991. 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), 1991
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=1991
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=1991.
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)?

Garland County, with 100% in 1991, according to EPA.

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

Mississippi County, with 28.6% in 1991.

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 1991 and are not ranked.

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

Counties in Arkansas: more rankings