Data / Highest daily Air Quality Index (US EPA) / Harnett County

Highest daily Air Quality Index (US EPA) in Harnett County

Highest daily Air Quality Index (US EPA) in Harnett County was 48 in 2000, according to the U.S. Environmental Protection Agency. That is down 12 from 1999.

2000, index48
Change on 1999-12
Series high641992
Series low421996

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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Highest daily Air Quality Index (US EPA) in Harnett County, 1990 to 2000

4045505560651990199219941996199820001990: 53 index1991: 52 index1992: 64 index1993: 44 index1994: 48 index1995: 50 index1996: 42 index1997: 47 index1998: 55 index1999: 60 index2000: 48 index405060701990199420001990: 53 index1991: 52 index1992: 64 index1993: 44 index1994: 48 index1995: 50 index1996: 42 index1997: 47 index1998: 55 index1999: 60 index2000: 48 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
200048
199960
199855
199747
199642
199550
199448
199344
199264
199152
199053

Harnett County compared with nearby places

Alamance County: 104 indexAlexander County: 182 indexAvery County: 172 indexBuncombe County: 179 indexCabarrus County: 118 indexCaldwell County: 164 indexCamden County: 147 indexCarteret County: 147 indexCaswell County: 192 indexCatawba County: 148 indexChatham County: 147 indexCumberland County: 182 indexDavidson County: 129 indexDavie County: 179 indexDuplin County: 164 indexDurham County: 182 indexEdgecombe County: 174 indexForsyth County: 172 indexFranklin County: 179 indexGaston County: 104 indexGranville County: 169 indexGuilford County: 185 indexHarnett County: 48 indexHaywood County: 174 indexHenderson County: 51 indexHyde County: 72 indexJackson County: 174 indexJohnston County: 197 indexLenoir County: 182 indexLincoln County: 197 indexMcDowell County: 171 indexMacon County: 156 indexMartin County: 159 indexMecklenburg County: 222 indexMitchell County: 154 indexMontgomery County: 159 indexNew Hanover County: 182 indexNorthampton County: 151 indexOnslow County: 98 indexOrange County: 90 indexPasquotank County: 105 indexPerson County: 154 indexPitt County: 204 indexRobeson County: 83 indexRockingham County: 182 indexRowan County: 200 indexSwain County: 119 indexUnion County: 154 indexWake County: 209 indexWayne County: 111 indexYancey County: 179 index
  • Under 110
  • 110 to 150
  • 150 to 160
  • 160 to 180
  • 180 and over
  • No data
Highest daily Air Quality Index (US EPA), 2000, index. Harnett 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest daily AQI. 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 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: highest daily AQI, Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 2000. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/harnett-county-north-carolina. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 2000. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/harnett-county-north-carolina.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 2000 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/harnett-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2000,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 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/en/highest-daily-air-quality-index/harnett-county-north-carolina. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Harnett County, 1990 to 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/en/highest-daily-air-quality-index/harnett-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/harnett-county-north-carolina.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the highest daily Air Quality Index (US EPA) in Harnett County?

Highest daily Air Quality Index (US EPA) in Harnett County was 48 in 2000, according to the U.S. Environmental Protection Agency. That is down 12 from 1999.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Harnett County?

64 in 1992, the highest value since 1990 in this series.

Related statistics for Harnett County

All statistics for Harnett County | Harnett County in figures