Data / Median Air Quality Index (US EPA) / Harnett County

Median Air Quality Index (US EPA) in Harnett County

Median Air Quality Index (US EPA) in Harnett County was 23 in 2000, according to the U.S. Environmental Protection Agency. That is up 1 from 1999.

2000, index23
Change on 1999+1
Series high261990
Series low201997

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

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

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

202224261990199219941996199820001990: 26 index1991: 23 index1992: 24 index1993: 23 index1994: 23 index1995: 21 index1996: 22 index1997: 20 index1998: 25 index1999: 22 index2000: 23 index202224261990199420001990: 26 index1991: 23 index1992: 24 index1993: 23 index1994: 23 index1995: 21 index1996: 22 index1997: 20 index1998: 25 index1999: 22 index2000: 23 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
200023
199922
199825
199720
199622
199521
199423
199323
199224
199123
199026

Harnett County compared with nearby places

Alamance County: 61 indexAlexander County: 58 indexAvery County: 48 indexBuncombe County: 54 indexCabarrus County: 61 indexCaldwell County: 51 indexCamden County: 42 indexCarteret County: 39 indexCaswell County: 57 indexCatawba County: 63 indexChatham County: 52 indexCumberland County: 49 indexDavidson County: 65 indexDavie County: 61 indexDuplin County: 53 indexDurham County: 63 indexEdgecombe County: 56 indexForsyth County: 63 indexFranklin County: 48 indexGaston County: 62 indexGranville County: 47 indexGuilford County: 63 indexHarnett County: 23 indexHaywood County: 62 indexHenderson County: 20 indexHyde County: 45 indexJackson County: 67 indexJohnston County: 50 indexLenoir County: 53 indexLincoln County: 54 indexMcDowell County: 61 indexMacon County: 42 indexMartin County: 49 indexMecklenburg County: 67 indexMitchell County: 61 indexMontgomery County: 50 indexNew Hanover County: 43 indexNorthampton County: 45 indexOnslow County: 56 indexOrange County: 52 indexPasquotank County: 54 indexPerson County: 49 indexPitt County: 58 indexRobeson County: 60 indexRockingham County: 45 indexRowan County: 58 indexSwain County: 51 indexUnion County: 44 indexWake County: 64 indexWayne County: 62 indexYancey County: 64 index
  • Under 45
  • 45 to 50
  • 50 to 54
  • 54 to 60
  • 60 to 63
  • 63 and over
  • No data
Median 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

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

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.

Report a problem with this figure

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median 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: median daily AQI (Median 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: median daily AQI, Median 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/median-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: median daily AQI. Median 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/median-air-quality-index/harnett-county-north-carolina.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median 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/median-air-quality-index/harnett-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2000,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median 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/median-air-quality-index/harnett-county-north-carolina. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median 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: median daily AQI: Median 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/median-air-quality-index/harnett-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-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: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest median Air Quality Index (US EPA) in Harnett County? Cite the source.
get_value {"indicator":"aqi_median","place":"us-county-37085"}
GET https://invokely.ai/api/v1/value?indicator=aqi_median&place=us-county-37085

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

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

Median Air Quality Index (US EPA) in Harnett County was 23 in 2000, according to the U.S. Environmental Protection Agency. That is up 1 from 1999.

Where does this figure come from?

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

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

26 in 1990, the highest value since 1990 in this series.

Related statistics for Harnett County

All statistics for Harnett County | Harnett County in figures