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

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

Yalobusha County had the highest share of days with good air quality (US EPA AQI) of 18 counties in 2000, at 63.5%. Jones County had the lowest, at 14.4%. The median was 39.1%. Source: EPA.

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Highest63.5Yalobusha County
Lowest14.4Jones County
Median39.118 counties

Map of counties, 2000

Adams County: 42.9 %Bolivar County: 41.4 %DeSoto County: 50.8 %Forrest County: 20.2 %Hancock County: 56.4 %Harrison County: 23.9 %Hinds County: 54.9 %Jackson County: 42.8 %Jones County: 14.4 %Lauderdale County: 35.2 %Lee County: 36.8 %Lowndes County: 23.1 %Madison County: 48.8 %Pearl River County: 24.4 %Rankin County: 22.3 %Scott County: 32.8 %Warren County: 44.1 %Yalobusha County: 63.5 %
  • Under 23
  • 23 to 35
  • 35 to 43
  • 43 to 50
  • 50 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

Yalobusha County: 63.5 %Yalobusha County63.5Hancock County: 56.4 %Hancock County56.4Hinds County: 54.9 %Hinds County54.9DeSoto County: 50.8 %DeSoto County50.8Madison County: 48.8 %Madison County48.8Warren County: 44.1 %Warren County44.1Adams County: 42.9 %Adams County42.9Jackson County: 42.8 %Jackson County42.8Bolivar County: 41.4 %Bolivar County41.4Lee County: 36.8 %Lee County36.8Lauderdale County: 35.2 %Lauderdale County35.2Scott County: 32.8 %Scott County32.8Pearl River County: 24.4 %Pearl River County24.4Harrison County: 23.9 %Harrison County23.9Lowndes County: 23.1 %Lowndes County23.1Rankin County: 22.3 %Rankin County22.3Forrest County: 20.2 %Forrest County20.2Jones County: 14.4 %Jones County14.4Yalobusha County: 63.5 %Yalobusha County63.5Hancock County: 56.4 %Hancock County56.4Hinds County: 54.9 %Hinds County54.9DeSoto County: 50.8 %DeSoto County50.8Madison County: 48.8 %Madison County48.8Warren County: 44.1 %Warren County44.1Adams County: 42.9 %Adams County42.9Jackson County: 42.8 %Jackson County42.8Bolivar County: 41.4 %Bolivar County41.4Lee County: 36.8 %Lee County36.8Lauderdale County: 35.2 %Lauderdale County35.2Scott County: 32.8 %Scott County32.8Pearl River County: 24.4 %Pearl River County24.4Harrison County: 23.9 %Harrison County23.9Lowndes County: 23.1 %Lowndes County23.1Rankin County: 22.3 %Rankin County22.3Forrest County: 20.2 %Forrest County20.2Jones County: 14.4 %Jones County14.4
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

RankCounties2000 (%)Change on 1999
1Yalobusha County63.5+2.6 pts
2Hancock County56.4+1.8 pts
3Hinds County54.9-2.4 pts
4DeSoto County50.8-3.7 pts
5Madison County48.8-6.3 pts
6Warren County44.1-1.3 pts
7Adams County42.9+3.8 pts
8Jackson County42.8+1.1 pts
9Bolivar County41.4+10.5 pts
10Lee County36.8+3.1 pts
11Lauderdale County35.2-2 pts
12Scott County32.8+13.8 pts
13Pearl River County24.4n/a
14Harrison County23.9-13.9 pts
15Lowndes County23.1+10.7 pts
16Rankin County22.3+9.2 pts
17Forrest County20.2+10 pts
18Jones County14.4-1.5 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. 11 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 Mississippi 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 Mississippi 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/mississippi-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 Mississippi 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/mississippi-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 Mississippi 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/mississippi-counties?period=2000 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_mississippi_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 Mississippi 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/mississippi-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 Mississippi 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/mississippi-counties?period=2000
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/mississippi-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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Questions

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

Yalobusha County, with 63.5% in 2000, according to EPA.

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

Jones County, with 14.4% 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. 11 counties have no value for 2000 and are not ranked.

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

Counties in Mississippi: more rankings