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)

Marion County had the highest share of days with good air quality (US EPA AQI) of 20 counties in 1993, at 100%. Pulaski County had the lowest, at 79.7%. The median was 96.7%. Source: EPA.

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Highest100Marion County
Lowest79.7Pulaski County
Median96.720 counties

Map of counties, 1993

Arkansas County: 96.4 %Ashley County: 98.4 %Clark County: 82.1 %Craighead County: 96.6 %Crittenden County: 82.7 %Garland County: 98.3 %Jefferson County: 96.7 %Marion County: 100 %Miller County: 98.3 %Montgomery County: 94.2 %Newton County: 80.7 %Ouachita County: 100 %Phillips County: 91.4 %Polk County: 96.4 %Pope County: 100 %Pulaski County: 79.7 %Sebastian County: 96.7 %Union County: 98.2 %Washington County: 96.1 %White County: 98.2 %
  • Under 90
  • 90 to 96
  • 96 to 97
  • 97 to 98
  • 98 and over
  • No data
%, 1993. 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, 1993

Marion County: 100 %Marion County100Ouachita County: 100 %Ouachita County100Pope County: 100 %Pope County100Ashley County: 98.4 %Ashley County98.4Garland County: 98.3 %Garland County98.3Miller County: 98.3 %Miller County98.3Union County: 98.2 %Union County98.2White County: 98.2 %White County98.2Jefferson County: 96.7 %Jefferson County96.7Sebastian County: 96.7 %Sebastian County96.7Craighead County: 96.6 %Craighead County96.6Arkansas County: 96.4 %Arkansas County96.4Polk County: 96.4 %Polk County96.4Washington County: 96.1 %Washington County96.1Montgomery County: 94.2 %Montgomery County94.2Phillips County: 91.4 %Phillips County91.4Crittenden County: 82.7 %Crittenden County82.7Clark County: 82.1 %Clark County82.1Newton County: 80.7 %Newton County80.7Pulaski County: 79.7 %Pulaski County79.7Marion County: 100 %Marion County100Ouachita County: 100 %Ouachita County100Pope County: 100 %Pope County100Ashley County: 98.4 %Ashley County98.4Garland County: 98.3 %Garland County98.3Miller County: 98.3 %Miller County98.3Union County: 98.2 %Union County98.2White County: 98.2 %White County98.2Jefferson County: 96.7 %Jefferson County96.7Sebastian County: 96.7 %Sebastian County96.7Craighead County: 96.6 %Craighead County96.6Arkansas County: 96.4 %Arkansas County96.4Polk County: 96.4 %Polk County96.4Washington County: 96.1 %Washington County96.1Montgomery County: 94.2 %Montgomery County94.2Phillips County: 91.4 %Phillips County91.4Crittenden County: 82.7 %Crittenden County82.7Clark County: 82.1 %Clark County82.1Newton County: 80.7 %Newton County80.7Pulaski County: 79.7 %Pulaski County79.7
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1993 (%)Change on 1992
1Marion County100+1.9 pts
1Ouachita County100+1.6 pts
1Pope County100+1.6 pts
4Ashley County98.4+5.1 pts
5Garland County98.3+1.6 pts
5Miller County98.3-0.1 pts
7Union County98.2+3.2 pts
7White County98.2-0.2 pts
9Jefferson County96.7-1.6 pts
9Sebastian County96.7-3 pts
11Craighead County96.6-1.7 pts
12Arkansas County96.4+1.3 pts
12Polk County96.4-1.7 pts
14Washington County96.1-2.2 pts
15Montgomery County94.2-5.3 pts
16Phillips County91.4-8.6 pts
17Crittenden County82.7-4 pts
18Clark County82.1-3.9 pts
19Newton County80.7+16.7 pts
20Pulaski County79.7+3.2 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. 6 counties with data in other periods have no value for 1993 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), 1993) [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), 1993. 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=1993. 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), 1993. 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=1993.

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), 1993 [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=1993 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_arkansas_by_1993,
  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), 1993}},
  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=1993. 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), 1993
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=1993
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=1993.
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)?

Marion County, with 100% in 1993, according to EPA.

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

Pulaski County, with 79.7% in 1993.

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. 6 counties have no value for 1993 and are not ranked.

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

Counties in Arkansas: more rankings