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

Median Air Quality Index (US EPA) in Riverside County

Median Air Quality Index (US EPA) in Riverside County was 80 in 2025, according to the U.S. Environmental Protection Agency. That is down 7 from 2024.

2025, index80
Change on 2024-7
Series high1361981
Series low771998

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 Riverside County, 1980 to 2025

608010012014019801987199420012008201520251980: 114 index1981: 136 index1982: 103 index1983: 100 index1984: 110 index1985: 108 index1986: 103 index1987: 105 index1988: 119 index1989: 126 index1990: 103 index1991: 105 index1992: 105 index1993: 100 index1994: 97 index1995: 93 index1996: 87 index1997: 89 index1998: 77 index1999: 96 index2000: 103 index2001: 110 index2002: 101 index2003: 97 index2004: 99 index2005: 91 index2006: 84 index2007: 101 index2008: 92 index2009: 87 index2010: 87 index2011: 93 index2012: 94 index2013: 88 index2014: 93 index2015: 88 index2016: 83 index2017: 87 index2018: 87 index2019: 77 index2020: 87 index2021: 89 index2022: 77 index2023: 77 index2024: 87 index2025: 80 index608010012014019801996201220251980: 114 index1981: 136 index1982: 103 index1983: 100 index1984: 110 index1985: 108 index1986: 103 index1987: 105 index1988: 119 index1989: 126 index1990: 103 index1991: 105 index1992: 105 index1993: 100 index1994: 97 index1995: 93 index1996: 87 index1997: 89 index1998: 77 index1999: 96 index2000: 103 index2001: 110 index2002: 101 index2003: 97 index2004: 99 index2005: 91 index2006: 84 index2007: 101 index2008: 92 index2009: 87 index2010: 87 index2011: 93 index2012: 94 index2013: 88 index2014: 93 index2015: 88 index2016: 83 index2017: 87 index2018: 87 index2019: 77 index2020: 87 index2021: 89 index2022: 77 index2023: 77 index2024: 87 index2025: 80 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202580
202487
202377
202277
202189
202087
201977
201887
201787
201683
201588
201493
201388
201294
201193
201087
200987
200892
2007101
200684
200591
200499
200397
2002101
2001110
2000103
199996
199877
199789
199687
199593
199497
1993100
1992105
1991105
1990103
1989126
1988119
1987105
1986103
1985108
1984110
1983100
1982103
1981136
1980114

Riverside County compared with nearby places

Amador County: 38 indexButte County: 46 indexCalaveras County: 40 indexColusa County: 40 indexDel Norte County: 32 indexEl Dorado County: 40 indexFresno County: 61 indexGlenn County: 40 indexHumboldt County: 38 indexImperial County: 64 indexInyo County: 55 indexKern County: 70 indexKings County: 57 indexLake County: 31 indexLos Angeles County: 74 indexMadera County: 50 indexMarin County: 21 indexMariposa County: 44 indexMendocino County: 38 indexMerced County: 50 indexMono County: 21 indexMonterey County: 38 indexNevada County: 42 indexOrange County: 53 indexPlacer County: 52 indexPlumas County: 45 indexRiverside County: 80 indexSacramento County: 49 indexSan Benito County: 39 indexSan Bernardino County: 77 indexSan Diego County: 67 indexSan Joaquin County: 46 indexSan Luis Obispo County: 50 indexSanta Barbara County: 52 indexSanta Cruz County: 35 indexShasta County: 44 indexSiskiyou County: 37 indexSolano County: 33 indexSonoma County: 9 indexStanislaus County: 51 indexSutter County: 47 indexTehama County: 38 indexTrinity County: 31 indexTulare County: 64 indexTuolumne County: 39 indexVentura County: 50 indexYolo County: 47 index
  • Under 36
  • 36 to 39
  • 39 to 45
  • 45 to 50
  • 50 to 58
  • 58 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Riverside 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), Riverside County, 1980 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), Riverside County, 1980 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/riverside-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), Riverside County, 1980 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/riverside-county-california.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Riverside County, 1980 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/riverside-county-california (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), Riverside County, 1980 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/riverside-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), Riverside County, 1980 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/riverside-county-california
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/riverside-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 Riverside County?

Median Air Quality Index (US EPA) in Riverside County was 80 in 2025, according to the U.S. Environmental Protection Agency. That is down 7 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 Riverside County?

136 in 1981, the highest value since 1980 in this series.

Related statistics for Riverside County

All statistics for Riverside County | Riverside County in figures