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

Median Air Quality Index (US EPA) in Alameda County

Median Air Quality Index (US EPA) in Alameda County was 49 in 2024, according to the U.S. Environmental Protection Agency. That is up 1 from 2023. That is the 20th highest of 52 counties in 2024.

2024, index49
Change on 2023+1
Rank20th of 52Counties in California ranked
Series high572018
Series low381983

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 Alameda County, 1980 to 2024

35404550556019801987199420012008201520241980: 40 index1981: 43 index1982: 39 index1983: 38 index1984: 42 index1985: 47 index1986: 44 index1987: 40 index1988: 47 index1989: 44 index1990: 38 index1991: 40 index1992: 38 index1993: 38 index1994: 39 index1995: 38 index1996: 40 index1997: 38 index1998: 38 index1999: 42 index2000: 41 index2001: 41 index2002: 42 index2003: 40 index2004: 52 index2005: 51 index2006: 53 index2007: 42 index2008: 56 index2009: 56 index2010: 52 index2011: 53 index2012: 50 index2013: 56 index2014: 52 index2015: 54 index2016: 52 index2017: 56 index2018: 57 index2019: 50 index2020: 52 index2021: 53 index2022: 49 index2023: 48 index2024: 49 index35404550556019801995201020241980: 40 index1981: 43 index1982: 39 index1983: 38 index1984: 42 index1985: 47 index1986: 44 index1987: 40 index1988: 47 index1989: 44 index1990: 38 index1991: 40 index1992: 38 index1993: 38 index1994: 39 index1995: 38 index1996: 40 index1997: 38 index1998: 38 index1999: 42 index2000: 41 index2001: 41 index2002: 42 index2003: 40 index2004: 52 index2005: 51 index2006: 53 index2007: 42 index2008: 56 index2009: 56 index2010: 52 index2011: 53 index2012: 50 index2013: 56 index2014: 52 index2015: 54 index2016: 52 index2017: 56 index2018: 57 index2019: 50 index2020: 52 index2021: 53 index2022: 49 index2023: 48 index2024: 49 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 45 values
Periodindex
202449
202348
202249
202153
202052
201950
201857
201756
201652
201554
201452
201356
201250
201153
201052
200956
200856
200742
200653
200551
200452
200340
200242
200141
200041
199942
199838
199738
199640
199538
199439
199338
199238
199140
199038
198944
198847
198740
198644
198547
198442
198338
198239
198143
198040

Alameda County compared with nearby places

Alameda County: 49 indexAmador County: 40 indexButte County: 46 indexCalaveras County: 42 indexColusa County: 54 indexContra Costa County: 48 indexDel Norte County: 32 indexEl Dorado County: 44 indexFresno County: 67 indexGlenn County: 39 indexHumboldt County: 38 indexImperial County: 63 indexInyo County: 61 indexKern County: 72 indexKings County: 60 indexLake County: 32 indexLos Angeles County: 80 indexMadera County: 52 indexMarin County: 28 indexMariposa County: 45 indexMendocino County: 43 indexMerced County: 52 indexMono County: 19 indexMonterey County: 39 indexNevada County: 36 indexOrange County: 54 indexPlacer County: 50 indexPlumas County: 48 indexRiverside County: 87 indexSacramento County: 51 indexSan Benito County: 43 indexSan Bernardino County: 87 indexSan Diego County: 71 indexSan Francisco County: 33 indexSan Joaquin County: 51 indexSan Luis Obispo County: 49 indexSan Mateo County: 27 indexSanta Barbara County: 49 indexSanta Clara County: 47 indexSanta Cruz County: 39 indexShasta County: 44 indexSiskiyou County: 40 indexSolano County: 39 indexSonoma County: 19 indexStanislaus County: 53 indexSutter County: 49 indexTehama County: 43 indexTrinity County: 31 indexTulare County: 71 indexTuolumne County: 40 indexVentura County: 50 indexYolo County: 45 index
  • Under 37
  • 37 to 42
  • 42 to 47
  • 47 to 50
  • 50 to 61
  • 61 and over
  • No data
Median Air Quality Index (US EPA), 2024, index. Alameda 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), Alameda County, 1980 to 2024) [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), Alameda County, 1980 to 2024. 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/alameda-county-california. 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), Alameda County, 1980 to 2024. 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/alameda-county-california.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Alameda County, 1980 to 2024 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/alameda-county-california (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2024,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Alameda County, 1980 to 2024}},
  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/alameda-county-california. 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), Alameda County, 1980 to 2024
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/alameda-county-california
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/alameda-county-california.
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 Alameda County?

Median Air Quality Index (US EPA) in Alameda County was 49 in 2024, according to the U.S. Environmental Protection Agency. That is up 1 from 2023. That is the 20th highest of 52 counties in 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 Alameda County?

57 in 2018, the highest value since 1980 in this series.

Related statistics for Alameda County

All statistics for Alameda County | Alameda County in figures