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

Median Air Quality Index (US EPA) in Cobb County

Median Air Quality Index (US EPA) in Cobb County was 35 in 2025, according to the U.S. Environmental Protection Agency. That is down 13 from 2024.

2025, index35
Change on 2024-13
Series high671999
Series low352025

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 Cobb County, 1999 to 2025

304050607019992003200720112015201920251999: 67 index2000: 60 index2001: 58 index2002: 54 index2003: 53 index2004: 50 index2005: 56 index2006: 59 index2007: 60 index2008: 55 index2009: 54 index2010: 56 index2011: 55 index2012: 53 index2013: 50 index2014: 52 index2015: 50 index2016: 50 index2017: 43 index2018: 41 index2019: 44 index2020: 36 index2021: 41 index2022: 40 index2023: 43 index2024: 48 index2025: 35 index304050607019992008201720251999: 67 index2000: 60 index2001: 58 index2002: 54 index2003: 53 index2004: 50 index2005: 56 index2006: 59 index2007: 60 index2008: 55 index2009: 54 index2010: 56 index2011: 55 index2012: 53 index2013: 50 index2014: 52 index2015: 50 index2016: 50 index2017: 43 index2018: 41 index2019: 44 index2020: 36 index2021: 41 index2022: 40 index2023: 43 index2024: 48 index2025: 35 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 27 values
Periodindex
202535
202448
202343
202240
202141
202036
201944
201841
201743
201650
201550
201452
201350
201253
201155
201056
200954
200855
200760
200659
200556
200450
200353
200254
200158
200060
199967

Cobb County compared with nearby places

Bibb County: 52 indexCharlton County: 27 indexChatham County: 47 indexClarke County: 46 indexClayton County: 48 indexCobb County: 35 indexCoffee County: 44 indexDawson County: 34 indexDeKalb County: 47 indexDougherty County: 46 indexDouglas County: 39 indexFloyd County: 38 indexFulton County: 49 indexGlynn County: 41 indexGwinnett County: 47 indexHall County: 46 indexHenry County: 39 indexHouston County: 46 indexLowndes County: 49 indexMurray County: 39 indexMuscogee County: 48 indexPike County: 38 indexRichmond County: 52 indexRockdale County: 36 indexWalker County: 48 indexWashington County: 46 index
  • Under 38
  • 38 to 44
  • 44 to 46
  • 46 to 48
  • 48 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Cobb 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), Cobb County, 1999 to 2025) [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), Cobb County, 1999 to 2025. 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/cobb-county-georgia. 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), Cobb County, 1999 to 2025. 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/cobb-county-georgia.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Cobb County, 1999 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/cobb-county-georgia (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Cobb County, 1999 to 2025}},
  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/cobb-county-georgia. 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), Cobb County, 1999 to 2025
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/cobb-county-georgia
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/cobb-county-georgia.
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 Cobb County?

Median Air Quality Index (US EPA) in Cobb County was 35 in 2025, according to the U.S. Environmental Protection Agency. That is down 13 from 2024.

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 Cobb County?

67 in 1999, the highest value since 1999 in this series.

Related statistics for Cobb County

All statistics for Cobb County | Cobb County in figures