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

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

Highest daily Air Quality Index (US EPA) in Buchanan County was 39 in 1992, according to the U.S. Environmental Protection Agency. That is down 107 from 1991.

1992, index39
Change on 1991-107
Series high1461991
Series low391992

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.

Highest daily Air Quality Index (US EPA) in Buchanan County, 1988 to 1992

255075100125150198819891990199119921988: 74 index1989: 86 index1990: 78 index1991: 146 index1992: 39 index0501001501988199019921988: 74 index1989: 86 index1990: 78 index1991: 146 index1992: 39 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 5 values
Periodindex
199239
1991146
199078
198986
198874

Buchanan County compared with nearby places

Amherst County: 151 indexArlington County: 177 indexAugusta County: 166 indexBuchanan County: 39 indexCampbell County: 36 indexCarroll County: 51 indexCharles City County: 195 indexChesterfield County: 182 indexCulpeper County: 40 indexFairfax County: 192 indexFauquier County: 166 indexFrederick County: 159 indexGiles County: 156 indexHanover County: 190 indexHenrico County: 197 indexKing William County: 49 indexLoudoun County: 34 indexMadison County: 174 indexNorthumberland County: 54 indexPrince Edward County: 164 indexPrince William County: 179 indexRoanoke County: 140 indexSmyth County: 57 indexStafford County: 93 indexWarren County: 159 indexWythe County: 136 indexYork County: 48 indexAlexandria city: 161 indexBristol city: 47 indexCharlottesville city: 35 indexChesapeake city: 50 indexCovington city: 52 indexFairfax city: 67 indexFredericksburg city: 39 indexHampton city: 206 indexLynchburg city: 46 indexMartinsville city: 46 indexNewport News city: 48 indexNorfolk city: 106 indexRichmond city: 101 indexRoanoke city: 63 indexSuffolk city: 217 indexWinchester city: 37 index
  • Under 46
  • 46 to 51
  • 51 to 100
  • 100 to 160
  • 160 to 180
  • 180 and over
  • No data
Highest daily Air Quality Index (US EPA), 1992, index. Buchanan 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.

Report a problem with this figure

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), Buchanan County, 1988 to 1992) [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), Buchanan County, 1988 to 1992. 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/buchanan-county-virginia. 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), Buchanan County, 1988 to 1992. 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/buchanan-county-virginia.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Buchanan County, 1988 to 1992 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/buchanan-county-virginia (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_1992,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Buchanan County, 1988 to 1992}},
  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/buchanan-county-virginia. 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), Buchanan County, 1988 to 1992
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/buchanan-county-virginia
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/buchanan-county-virginia.
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  -
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 highest daily Air Quality Index (US EPA) in Buchanan County? Cite the source.
get_value {"indicator":"aqi_max","place":"us-county-51027"}
GET https://invokely.ai/api/v1/value?indicator=aqi_max&place=us-county-51027

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

Questions

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

Highest daily Air Quality Index (US EPA) in Buchanan County was 39 in 1992, according to the U.S. Environmental Protection Agency. That is down 107 from 1991.

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 Buchanan County?

146 in 1991, the highest value since 1988 in this series.

Related statistics for Buchanan County

All statistics for Buchanan County | Buchanan County in figures