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

Median Air Quality Index (US EPA) in Washington County

Median Air Quality Index (US EPA) in Washington County was 48 in 2002, according to the U.S. Environmental Protection Agency. That is unchanged from 2001.

2002, index48
Change on 20010
Series high491999
Series low161994

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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Median Air Quality Index (US EPA) in Washington County, 1983 to 2002

102030405019831986198919921995199820021983: 21 index1984: 24 index1985: 22 index1986: 21 index1987: 23 index1988: 20 index1989: 20 index1990: 20 index1991: 19 index1992: 19 index1993: 19 index1994: 16 index1995: 16 index1996: 18 index1997: 19 index1998: 18 index1999: 49 index2000: 46 index2001: 48 index2002: 48 index10203040501983199020021983: 21 index1984: 24 index1985: 22 index1986: 21 index1987: 23 index1988: 20 index1989: 20 index1990: 20 index1991: 19 index1992: 19 index1993: 19 index1994: 16 index1995: 16 index1996: 18 index1997: 19 index1998: 18 index1999: 49 index2000: 46 index2001: 48 index2002: 48 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 20 values
Periodindex
200248
200148
200046
199949
199818
199719
199618
199516
199416
199319
199219
199119
199020
198920
198820
198723
198621
198522
198424
198321

Washington County compared with nearby places

Bennington County: 40 indexChittenden County: 38 indexRutland County: 25 indexWashington County: 48 index
  • Under 35
  • 35 to 39
  • 39 to 42
  • 42 and over
  • No data
Median Air Quality Index (US EPA), 2002, index. Washington 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.

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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), Washington County, 1983 to 2002) [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), Washington County, 1983 to 2002. 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/washington-county-vermont. 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), Washington County, 1983 to 2002. 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/washington-county-vermont.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Washington County, 1983 to 2002 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/washington-county-vermont (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2002,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Washington County, 1983 to 2002}},
  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/washington-county-vermont. 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), Washington County, 1983 to 2002
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/washington-county-vermont
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/washington-county-vermont.
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  -
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Questions

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

Median Air Quality Index (US EPA) in Washington County was 48 in 2002, according to the U.S. Environmental Protection Agency. That is unchanged from 2001.

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 Washington County?

49 in 1999, the highest value since 1983 in this series.

Related statistics for Washington County

All statistics for Washington County | Washington County in figures