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

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

Share of days with good air quality (US EPA AQI) in Brunswick County was 100% in 1990, according to EPA. That is up 4.7 pts from 1989.

1990100%
Change on 1989+4.7 pts
Series high1001990
Series low95.31989

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 Brunswick County, 1988 to 1990

95969798991001988198919901988: 96.3 %1989: 95.3 %1990: 100 %9496981001988198919901988: 96.3 %1989: 95.3 %1990: 100 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 3 values
Period%
1990100
198995.3
198896.3

Brunswick County compared with nearby places

Alexander County: 46.7 %Avery County: 56.9 %Brunswick County: 100 %Buncombe County: 83.7 %Camden County: 59.5 %Cumberland County: 58.1 %Durham County: 85.5 %Edgecombe County: 53.1 %Forsyth County: 54.5 %Granville County: 53.2 %Guilford County: 63.3 %Harnett County: 94.1 %Johnston County: 54.5 %McDowell County: 100 %Macon County: 79.7 %Mecklenburg County: 46.8 %Mitchell County: 100 %Montgomery County: 90.2 %New Hanover County: 63.5 %Onslow County: 95 %Pasquotank County: 100 %Wake County: 48.8 %Wayne County: 100 %
  • Under 54
  • 54 to 59
  • 59 to 84
  • 84 to 98
  • 98 and over
  • No data
Share of days with good air quality (US EPA AQI), 1990, %. Brunswick 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), Brunswick County, 1988 to 1990) [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), Brunswick County, 1988 to 1990. 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/brunswick-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), Brunswick County, 1988 to 1990. 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/brunswick-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), Brunswick County, 1988 to 1990 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/brunswick-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_1990,
  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), Brunswick County, 1988 to 1990}},
  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/brunswick-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), Brunswick County, 1988 to 1990
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/brunswick-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/brunswick-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 Brunswick County?

Share of days with good air quality (US EPA AQI) in Brunswick County was 100% in 1990, according to EPA. That is up 4.7 pts from 1989.

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 Brunswick County?

100% in 1990, the highest value since 1988 in this series.

Related statistics for Brunswick County

All statistics for Brunswick County | Brunswick County in figures