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)

Mississippi County had the highest share of days with good air quality (US EPA AQI) of 21 counties in 1992, at 100%. Newton County had the lowest, at 64%. The median was 98.3%. Source: EPA.

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Highest100Mississippi County
Lowest64Newton County
Median98.321 counties

Map of counties, 1992

Arkansas County: 95.1 %Ashley County: 93.3 %Clark County: 86 %Craighead County: 98.3 %Crittenden County: 86.7 %Garland County: 96.7 %Jefferson County: 98.3 %Marion County: 98.1 %Miller County: 98.4 %Mississippi County: 100 %Montgomery County: 99.5 %Newton County: 64 %Ouachita County: 98.4 %Phillips County: 100 %Polk County: 98.1 %Pope County: 98.4 %Pulaski County: 76.5 %Sebastian County: 99.7 %Union County: 95 %Washington County: 98.3 %White County: 98.4 %
  • Under 93
  • 93 to 98
  • 98 and over
  • No data
%, 1992. 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, 1992

Mississippi County: 100 %Mississippi County100Phillips County: 100 %Phillips County100Sebastian County: 99.7 %Sebastian County99.7Montgomery County: 99.5 %Montgomery County99.5Miller County: 98.4 %Miller County98.4Ouachita County: 98.4 %Ouachita County98.4Pope County: 98.4 %Pope County98.4White County: 98.4 %White County98.4Craighead County: 98.3 %Craighead County98.3Jefferson County: 98.3 %Jefferson County98.3Washington County: 98.3 %Washington County98.3Marion County: 98.1 %Marion County98.1Polk County: 98.1 %Polk County98.1Garland County: 96.7 %Garland County96.7Arkansas County: 95.1 %Arkansas County95.1Union County: 95 %Union County95Ashley County: 93.3 %Ashley County93.3Crittenden County: 86.7 %Crittenden County86.7Clark County: 86 %Clark County86Pulaski County: 76.5 %Pulaski County76.5Newton County: 64 %Newton County64Mississippi County: 100 %Mississippi County100Phillips County: 100 %Phillips County100Sebastian County: 99.7 %Sebastian County99.7Montgomery County: 99.5 %Montgomery County99.5Miller County: 98.4 %Miller County98.4Ouachita County: 98.4 %Ouachita County98.4Pope County: 98.4 %Pope County98.4White County: 98.4 %White County98.4Craighead County: 98.3 %Craighead County98.3Jefferson County: 98.3 %Jefferson County98.3Washington County: 98.3 %Washington County98.3Marion County: 98.1 %Marion County98.1Polk County: 98.1 %Polk County98.1Garland County: 96.7 %Garland County96.7Arkansas County: 95.1 %Arkansas County95.1Union County: 95 %Union County95Ashley County: 93.3 %Ashley County93.3Crittenden County: 86.7 %Crittenden County86.7Clark County: 86 %Clark County86Pulaski County: 76.5 %Pulaski County76.5Newton County: 64 %Newton County64
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties1992 (%)Change on 1991
1Mississippi County100+71.4 pts
1Phillips County1000 pts
3Sebastian County99.7+0.5 pts
4Montgomery County99.5-0.5 pts
5Miller County98.4-1.6 pts
5Ouachita County98.4+0.2 pts
5Pope County98.4-1.6 pts
5White County98.4+0.1 pts
9Craighead County98.3+1.7 pts
9Jefferson County98.3-1.7 pts
9Washington County98.3-1.7 pts
12Marion County98.1-1.9 pts
12Polk County98.1-1.9 pts
14Garland County96.7-3.3 pts
15Arkansas County95.1+0.2 pts
16Union County95-3.3 pts
17Ashley County93.3-1.5 pts
18Crittenden County86.7+10.6 pts
19Clark County86+3.4 pts
20Pulaski County76.5-1 pts
21Newton County64-11 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 1992 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), 1992) [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), 1992. 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=1992. 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), 1992. 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=1992.

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), 1992 [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=1992 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_arkansas_by_1992,
  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), 1992}},
  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=1992. 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), 1992
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=1992
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=1992.
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)?

Mississippi County, with 100% in 1992, according to EPA.

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

Newton County, with 64% in 1992.

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 1992 and are not ranked.

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

Counties in Arkansas: more rankings