Data / Share of days with good air quality (US EPA AQI) / Randolph County

Share of days with good air quality (US EPA AQI) in Randolph County

Share of days with good air quality (US EPA AQI) in Randolph County was 69.6% in 2004, according to EPA. That is down 0.1 pts from 2003. That is the 13th highest of 50 counties in 2004.

200469.6%
Change on 2003-0.1 pts
Rank13th of 50Counties in North Carolina ranked
Series high69.72003
Series low45.82001

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Share of days with good air quality (US EPA AQI) in Randolph County, 2001 to 2004

45505560657020012002200320042001: 45.8 %2002: 56.1 %2003: 69.7 %2004: 69.6 %40506070200120042001: 45.8 %2002: 56.1 %2003: 69.7 %2004: 69.6 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 4 values
Period%
200469.6
200369.7
200256.1
200145.8

Randolph County compared with nearby places

Alamance County: 30.2 %Alexander County: 81.3 %Avery County: 69 %Buncombe County: 37 %Cabarrus County: 24.8 %Caldwell County: 79.8 %Camden County: 75.6 %Carteret County: 88.5 %Caswell County: 57.3 %Catawba County: 21.4 %Chatham County: 55.9 %Cumberland County: 61.7 %Davidson County: 15.6 %Davie County: 68 %Duplin County: 36.3 %Durham County: 29.2 %Edgecombe County: 56.1 %Forsyth County: 27.6 %Franklin County: 68.2 %Gaston County: 24 %Graham County: 65.4 %Granville County: 61.2 %Guilford County: 28.7 %Haywood County: 46.4 %Henderson County: 100 %Jackson County: 57.8 %Johnston County: 72.8 %Lenoir County: 57.7 %Lincoln County: 68.2 %McDowell County: 28.4 %Macon County: 92.4 %Martin County: 61.5 %Mecklenburg County: 18.3 %Mitchell County: 31.4 %Montgomery County: 66.3 %New Hanover County: 70.4 %Onslow County: 41.9 %Orange County: 29.2 %Person County: 71.8 %Pitt County: 56.9 %Randolph County: 69.6 %Robeson County: 35.8 %Rockingham County: 72.4 %Rowan County: 59.2 %Swain County: 65 %Union County: 70.6 %Wake County: 30.6 %Watauga County: 43.2 %Wayne County: 27.9 %Yancey County: 76 %
  • Under 29
  • 29 to 39
  • 39 to 58
  • 58 to 67
  • 67 to 72
  • 72 and over
  • No data
Share of days with good air quality (US EPA AQI), 2004, %. Randolph County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004) [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, Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/randolph-county-north-carolina. 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. Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/randolph-county-north-carolina.

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, Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/randolph-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2004,
  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: Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004}},
  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/en/good-air-quality-days-share/randolph-county-north-carolina. 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: Share of days with good air quality (US EPA AQI), Randolph County, 2001 to 2004
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/en/good-air-quality-days-share/randolph-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/randolph-county-north-carolina.
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

What is the share of days with good air quality (US EPA AQI) in Randolph County?

Share of days with good air quality (US EPA AQI) in Randolph County was 69.6% in 2004, according to EPA. That is down 0.1 pts from 2003. That is the 13th highest of 50 counties in 2004.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Randolph County?

69.7% in 2003, the highest value since 2001 in this series.

Related statistics for Randolph County

All statistics for Randolph County | Randolph County in figures