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

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

Share of days with good air quality (US EPA AQI) in Onslow County was 57.5% in 2007, according to EPA. That is up 10.4 pts from 2006.

200757.5%
Change on 2006+10.4 pts
Series high1001991
Series low32.52000

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 Onslow County, 1990 to 2007

204060801001990199319961999200220071990: 95 %1991: 100 %1992: 98.3 %1993: 100 %1994: 98.1 %1995: 100 %1996: 100 %1997: 100 %1998: 100 %1999: 40.2 %2000: 32.5 %2001: 44.1 %2002: 37.5 %2003: 37 %2004: 41.9 %2005: 44.2 %2006: 47.1 %2007: 57.5 %2040608010019901996200220071990: 95 %1991: 100 %1992: 98.3 %1993: 100 %1994: 98.1 %1995: 100 %1996: 100 %1997: 100 %1998: 100 %1999: 40.2 %2000: 32.5 %2001: 44.1 %2002: 37.5 %2003: 37 %2004: 41.9 %2005: 44.2 %2006: 47.1 %2007: 57.5 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 18 values
Period%
200757.5
200647.1
200544.2
200441.9
200337
200237.5
200144.1
200032.5
199940.2
1998100
1997100
1996100
1995100
199498.1
1993100
199298.3
1991100
199095

Onslow County compared with nearby places

Alamance County: 24.3 %Alexander County: 45.5 %Avery County: 61.8 %Buncombe County: 33.1 %Caldwell County: 53.9 %Carteret County: 86.7 %Caswell County: 30 %Catawba County: 20 %Chatham County: 48.6 %Cumberland County: 25.8 %Davidson County: 26.7 %Davie County: 39.7 %Duplin County: 48.3 %Durham County: 39.2 %Edgecombe County: 44.4 %Forsyth County: 24.7 %Franklin County: 52.8 %Gaston County: 27 %Graham County: 31.9 %Granville County: 40.2 %Guilford County: 30.1 %Haywood County: 33.2 %Henderson County: 100 %Hyde County: 69.2 %Jackson County: 31.7 %Johnston County: 51.4 %Lenoir County: 53.4 %Lincoln County: 40.7 %McDowell County: 17.6 %Macon County: 89 %Martin County: 47.4 %Mecklenburg County: 15.6 %Mitchell County: 32.8 %Montgomery County: 59.1 %New Hanover County: 52.8 %Onslow County: 57.5 %Orange County: 37.8 %Person County: 50.7 %Pitt County: 50 %Robeson County: 31.9 %Rockingham County: 43.1 %Rowan County: 21.4 %Swain County: 28.7 %Union County: 45.2 %Wake County: 24.9 %Watauga County: 41.1 %Wayne County: 34.7 %Yancey County: 33.3 %
  • Under 27
  • 27 to 33
  • 33 to 40
  • 40 to 48
  • 48 to 53
  • 53 and over
  • No data
Share of days with good air quality (US EPA AQI), 2007, %. Onslow 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), Onslow County, 1990 to 2007) [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), Onslow County, 1990 to 2007. 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/onslow-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), Onslow County, 1990 to 2007. 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/onslow-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), Onslow County, 1990 to 2007 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/onslow-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2007,
  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), Onslow County, 1990 to 2007}},
  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/onslow-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), Onslow County, 1990 to 2007
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/onslow-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/onslow-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 Onslow County?

Share of days with good air quality (US EPA AQI) in Onslow County was 57.5% in 2007, according to EPA. That is up 10.4 pts from 2006.

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 Onslow County?

100% in 1991, the highest value since 1990 in this series.

Related statistics for Onslow County

All statistics for Onslow County | Onslow County in figures