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

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

Share of days with good air quality (US EPA AQI) in Colleton County was 100% in 2019, according to EPA. That is up 18.1 pts from 2018.

2019100%
Change on 2018+18.1 pts
Series high1002019
Series low47.31999

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Share of days with good air quality (US EPA AQI) in Colleton County, 1980 to 2019

40608010019801986199319992005201120191980: 82.5 %1981: 66.2 %1982: 69.6 %1983: 69.8 %1984: 70.5 %1985: 70.8 %1986: 70.1 %1987: 72.4 %1989: 75.4 %1990: 61.4 %1991: 86.7 %1992: 81.2 %1993: 67.2 %1994: 85.4 %1995: 79 %1996: 81.5 %1997: 69.8 %1998: 52.1 %1999: 47.3 %2000: 55 %2001: 66.5 %2002: 66.7 %2003: 82.2 %2004: 81 %2005: 79.6 %2006: 75.9 %2007: 77.7 %2008: 83.1 %2009: 94.2 %2010: 90.1 %2011: 50.1 %2012: 59.1 %2013: 71.9 %2014: 69.3 %2015: 84.3 %2016: 77 %2017: 73.7 %2018: 81.9 %2019: 100 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 39 values
Period%
2019100
201881.9
201773.7
201677
201584.3
201469.3
201371.9
201259.1
201150.1
201090.1
200994.2
200883.1
200777.7
200675.9
200579.6
200481
200382.2
200266.7
200166.5
200055
199947.3
199852.1
199769.8
199681.5
199579
199485.4
199367.2
199281.2
199186.7
199061.4
198975.4
198772.4
198670.1
198570.8
198470.5
198369.8
198269.6
198166.2
198082.5

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.

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), Colleton County, 1980 to 2019) [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), Colleton County, 1980 to 2019. 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/colleton-county-south-carolina. 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), Colleton County, 1980 to 2019. 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/colleton-county-south-carolina.

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), Colleton County, 1980 to 2019 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/colleton-county-south-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2019,
  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), Colleton County, 1980 to 2019}},
  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/colleton-county-south-carolina. 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), Colleton County, 1980 to 2019
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/colleton-county-south-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/colleton-county-south-carolina.
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 Colleton County?

Share of days with good air quality (US EPA AQI) in Colleton County was 100% in 2019, according to EPA. That is up 18.1 pts from 2018.

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 Colleton County?

100% in 2019, the highest value since 1980 in this series.

Related statistics for Colleton County

All statistics for Colleton County | Colleton County in figures