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

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

Share of days with good air quality (US EPA AQI) in Strafford County was 84.7% in 2003, according to EPA. That is up 6 pts from 2002. That is the 2nd highest of 9 counties in 2003.

200384.7%
Change on 2002+6 pts
Rank2nd of 9Counties in New Hampshire ranked
Series high1001990
Series low78.72002

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Share of days with good air quality (US EPA AQI) in Strafford County, 1990 to 2003

758085909510019901992199419961998200020031990: 100 %1991: 98.3 %1992: 98.4 %1993: 98.3 %1994: 100 %1995: 100 %1996: 91.9 %1997: 91.1 %1998: 84.2 %1999: 87.1 %2000: 93.3 %2001: 81.5 %2002: 78.7 %2003: 84.7 %7080901001990199520031990: 100 %1991: 98.3 %1992: 98.4 %1993: 98.3 %1994: 100 %1995: 100 %1996: 91.9 %1997: 91.1 %1998: 84.2 %1999: 87.1 %2000: 93.3 %2001: 81.5 %2002: 78.7 %2003: 84.7 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 14 values
Period%
200384.7
200278.7
200181.5
200093.3
199987.1
199884.2
199791.1
199691.9
1995100
1994100
199398.3
199298.4
199198.3
1990100

Strafford County compared with nearby places

Belknap County: 75.6 %Cheshire County: 74.6 %Coos County: 58.4 %Grafton County: 87.8 %Hillsborough County: 70.1 %Merrimack County: 74 %Rockingham County: 78.2 %Strafford County: 84.7 %Sullivan County: 75 %
  • Under 72
  • 72 to 75
  • 75 to 81
  • 81 and over
  • No data
Share of days with good air quality (US EPA AQI), 2003, %. Strafford 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), Strafford County, 1990 to 2003) [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), Strafford County, 1990 to 2003. 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/strafford-county-new-hampshire. 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), Strafford County, 1990 to 2003. 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/strafford-county-new-hampshire.

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), Strafford County, 1990 to 2003 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/strafford-county-new-hampshire (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2003,
  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), Strafford County, 1990 to 2003}},
  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/strafford-county-new-hampshire. 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), Strafford County, 1990 to 2003
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/strafford-county-new-hampshire
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/strafford-county-new-hampshire.
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 Strafford County?

Share of days with good air quality (US EPA AQI) in Strafford County was 84.7% in 2003, according to EPA. That is up 6 pts from 2002. That is the 2nd highest of 9 counties in 2003.

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 Strafford County?

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

Related statistics for Strafford County

All statistics for Strafford County | Strafford County in figures