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

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

Share of days with good air quality (US EPA AQI) in Duplin County was 81.9% in 2015, according to EPA. That is up 37.7 pts from 2014.

201581.9%
Change on 2014+37.7 pts
Series high81.92015
Series low36.32004

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Share of days with good air quality (US EPA AQI) in Duplin County, 1992 to 2015

3040506070809019921996200020042008201220151992: 66.5 %1993: 52.4 %1994: 72.6 %1995: 75.7 %1996: 75.2 %1997: 76.5 %1998: 41 %1999: 48.4 %2000: 47.1 %2001: 46.9 %2002: 46.4 %2003: 62.5 %2004: 36.3 %2005: 40.7 %2006: 40.5 %2007: 48.3 %2008: 46.8 %2009: 71.6 %2010: 55.4 %2011: 54.6 %2012: 36.9 %2013: 48.3 %2014: 44.2 %2015: 81.9 %2040608010019922000200820151992: 66.5 %1993: 52.4 %1994: 72.6 %1995: 75.7 %1996: 75.2 %1997: 76.5 %1998: 41 %1999: 48.4 %2000: 47.1 %2001: 46.9 %2002: 46.4 %2003: 62.5 %2004: 36.3 %2005: 40.7 %2006: 40.5 %2007: 48.3 %2008: 46.8 %2009: 71.6 %2010: 55.4 %2011: 54.6 %2012: 36.9 %2013: 48.3 %2014: 44.2 %2015: 81.9 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 24 values
Period%
201581.9
201444.2
201348.3
201236.9
201154.6
201055.4
200971.6
200846.8
200748.3
200640.5
200540.7
200436.3
200362.5
200246.4
200146.9
200047.1
199948.4
199841
199776.5
199675.2
199575.7
199472.6
199352.4
199266.5

Duplin County compared with nearby places

Alamance County: 67.3 %Alexander County: 82.8 %Avery County: 86.7 %Buncombe County: 70.5 %Caldwell County: 83.6 %Carteret County: 94.3 %Caswell County: 59.2 %Catawba County: 48.1 %Chatham County: 92.9 %Cumberland County: 67.2 %Davidson County: 35.5 %Duplin County: 81.9 %Durham County: 56.3 %Edgecombe County: 71.8 %Forsyth County: 52.9 %Franklin County: 81 %Gaston County: 80.6 %Graham County: 80.6 %Granville County: 78.1 %Guilford County: 59.3 %Haywood County: 68.8 %Hyde County: 88.3 %Jackson County: 72 %Johnston County: 80.5 %Lee County: 49.2 %Lenoir County: 88.5 %Lincoln County: 76 %McDowell County: 65.3 %Macon County: 95.2 %Martin County: 71.8 %Mecklenburg County: 47.4 %Mitchell County: 73.3 %Montgomery County: 64.9 %New Hanover County: 81.4 %Person County: 79.1 %Pitt County: 82.2 %Rockingham County: 76.6 %Rowan County: 46.4 %Swain County: 67.8 %Union County: 73.2 %Wake County: 38.9 %Watauga County: 83.2 %Wayne County: 32 %Yancey County: 70.8 %
  • Under 53
  • 53 to 67
  • 67 to 73
  • 73 to 81
  • 81 to 83
  • 83 and over
  • No data
Share of days with good air quality (US EPA AQI), 2015, %. Duplin 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), Duplin County, 1992 to 2015) [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), Duplin County, 1992 to 2015. 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/duplin-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), Duplin County, 1992 to 2015. 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/duplin-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), Duplin County, 1992 to 2015 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/duplin-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2015,
  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), Duplin County, 1992 to 2015}},
  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/duplin-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), Duplin County, 1992 to 2015
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/duplin-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/duplin-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 Duplin County?

Share of days with good air quality (US EPA AQI) in Duplin County was 81.9% in 2015, according to EPA. That is up 37.7 pts from 2014.

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 Duplin County?

81.9% in 2015, the highest value since 1992 in this series.

Related statistics for Duplin County

All statistics for Duplin County | Duplin County in figures