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 2001, at 92.5%. Pulaski County had the lowest, at 18.6%. The median was 33.3%. Source: EPA.

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Highest92.5Montgomery County
Lowest18.6Pulaski County
Median33.321 counties

Map of counties, 2001

Arkansas County: 40.8 %Ashley County: 29.8 %Clark County: 81.2 %Craighead County: 30 %Crittenden County: 57.5 %Faulkner County: 34.4 %Garland County: 32.8 %Jefferson County: 26.4 %Marion County: 54.9 %Miller County: 30.2 %Mississippi County: 32.6 %Montgomery County: 92.5 %Newton County: 70.9 %Phillips County: 33 %Polk County: 37.2 %Pope County: 33.6 %Pulaski County: 18.6 %Sebastian County: 24.5 %Union County: 29.3 %Washington County: 39.4 %White County: 33.3 %
  • Under 30
  • 30 to 33
  • 33 to 34
  • 34 to 55
  • 55 and over
  • No data
%, 2001. 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, 2001

Montgomery County: 92.5 %Montgomery County92.5Clark County: 81.2 %Clark County81.2Newton County: 70.9 %Newton County70.9Crittenden County: 57.5 %Crittenden County57.5Marion County: 54.9 %Marion County54.9Arkansas County: 40.8 %Arkansas County40.8Washington County: 39.4 %Washington County39.4Polk County: 37.2 %Polk County37.2Faulkner County: 34.4 %Faulkner County34.4Pope County: 33.6 %Pope County33.6White County: 33.3 %White County33.3Phillips County: 33 %Phillips County33Garland County: 32.8 %Garland County32.8Mississippi County: 32.6 %Mississippi County32.6Miller County: 30.2 %Miller County30.2Craighead County: 30 %Craighead County30Ashley County: 29.8 %Ashley County29.8Union County: 29.3 %Union County29.3Jefferson County: 26.4 %Jefferson County26.4Sebastian County: 24.5 %Sebastian County24.5Pulaski County: 18.6 %Pulaski County18.6Montgomery County: 92.5 %Montgomery County92.5Clark County: 81.2 %Clark County81.2Newton County: 70.9 %Newton County70.9Crittenden County: 57.5 %Crittenden County57.5Marion County: 54.9 %Marion County54.9Arkansas County: 40.8 %Arkansas County40.8Washington County: 39.4 %Washington County39.4Polk County: 37.2 %Polk County37.2Faulkner County: 34.4 %Faulkner County34.4Pope County: 33.6 %Pope County33.6White County: 33.3 %White County33.3Phillips County: 33 %Phillips County33Garland County: 32.8 %Garland County32.8Mississippi County: 32.6 %Mississippi County32.6Miller County: 30.2 %Miller County30.2Craighead County: 30 %Craighead County30Ashley County: 29.8 %Ashley County29.8Union County: 29.3 %Union County29.3Jefferson County: 26.4 %Jefferson County26.4Sebastian County: 24.5 %Sebastian County24.5Pulaski County: 18.6 %Pulaski County18.6
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2001 (%)Change on 2000
1Montgomery County92.5+7.3 pts
2Clark County81.2+4.8 pts
3Newton County70.9+4.2 pts
4Crittenden County57.5-3.4 pts
5Marion County54.9+10 pts
6Arkansas County40.8+20 pts
7Washington County39.4+9.2 pts
8Polk County37.2+8.4 pts
9Faulkner County34.4+14.4 pts
10Pope County33.6+11.7 pts
11White County33.3+9.8 pts
12Phillips County33+9.8 pts
13Garland County32.8+6.4 pts
14Mississippi County32.6+12.6 pts
15Miller County30.2+20.7 pts
16Craighead County30+17.7 pts
17Ashley County29.8+20.9 pts
18Union County29.3+9.7 pts
19Jefferson County26.4+14.1 pts
20Sebastian County24.5+4.5 pts
21Pulaski County18.6+4.7 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 2001 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), 2001) [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), 2001. 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=2001. 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), 2001. 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=2001.

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), 2001 [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=2001 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_arkansas_by_2001,
  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), 2001}},
  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=2001. 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), 2001
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=2001
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/arkansas-counties?period=2001.
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)?

Montgomery County, with 92.5% in 2001, according to EPA.

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

Pulaski County, with 18.6% in 2001.

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 2001 and are not ranked.

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

Counties in Arkansas: more rankings