EnviroNearby

El Dorado County, California air quality history

Daily Air Quality Index summaries from EPA monitors in El Dorado, California, 1980–2025.

88%
Good days in 2025
40
Median daily AQI, 2025
1
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for El Dorado, California on 365 days. 320 of those days (88%) were in the Good range, and the median daily AQI was 40. That median is lower than the typical monitored county in California (median 45.5 across 46 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 364 days. Across the years with fuller monitoring, the share of Good days rose: an average of 32% in 1980–1982 versus 77% in 2023–2025.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1980: Good 188 of 366 days1980: Moderate 155 of 366 days1980: Unhealthy for Sensitive Groups 21 of 366 days1980: Unhealthy 2 of 366 days19801981: Good 77 of 365 days1981: Moderate 237 of 365 days1981: Unhealthy for Sensitive Groups 42 of 365 days1981: Unhealthy 9 of 365 days1982: Good 82 of 365 days1982: Moderate 233 of 365 days1982: Unhealthy for Sensitive Groups 41 of 365 days1982: Unhealthy 7 of 365 days1982: Very Unhealthy 2 of 365 days1983: Good 95 of 365 days1983: Moderate 238 of 365 days1983: Unhealthy for Sensitive Groups 24 of 365 days1983: Unhealthy 4 of 365 days1983: Very Unhealthy 4 of 365 days1984: Good 86 of 366 days1984: Moderate 242 of 366 days1984: Unhealthy for Sensitive Groups 30 of 366 days1984: Unhealthy 8 of 366 days1985: Good 112 of 365 days1985: Moderate 216 of 365 days1985: Unhealthy for Sensitive Groups 28 of 365 days1985: Unhealthy 6 of 365 days1985: Very Unhealthy 3 of 365 days19851986: Good 111 of 365 days1986: Moderate 234 of 365 days1986: Unhealthy for Sensitive Groups 19 of 365 days1986: Unhealthy 1 of 365 days1987: Good 79 of 365 days1987: Moderate 250 of 365 days1987: Unhealthy for Sensitive Groups 33 of 365 days1987: Unhealthy 3 of 365 days1988: Good 124 of 366 days1988: Moderate 214 of 366 days1988: Unhealthy for Sensitive Groups 27 of 366 days1988: Unhealthy 1 of 366 days1989: Good 116 of 365 days1989: Moderate 185 of 365 days1989: Unhealthy for Sensitive Groups 46 of 365 days1989: Unhealthy 16 of 365 days1989: Very Unhealthy 2 of 365 days1990: Good 164 of 365 days1990: Moderate 187 of 365 days1990: Unhealthy for Sensitive Groups 14 of 365 days19901991: Good 162 of 365 days1991: Moderate 193 of 365 days1991: Unhealthy for Sensitive Groups 10 of 365 days1992: Good 136 of 366 days1992: Moderate 146 of 366 days1992: Unhealthy for Sensitive Groups 59 of 366 days1992: Unhealthy 23 of 366 days1992: Very Unhealthy 2 of 366 days1993: Good 163 of 365 days1993: Moderate 150 of 365 days1993: Unhealthy for Sensitive Groups 44 of 365 days1993: Unhealthy 7 of 365 days1993: Very Unhealthy 1 of 365 days1994: Good 151 of 365 days1994: Moderate 137 of 365 days1994: Unhealthy for Sensitive Groups 55 of 365 days1994: Unhealthy 22 of 365 days1995: Good 177 of 365 days1995: Moderate 126 of 365 days1995: Unhealthy for Sensitive Groups 34 of 365 days1995: Unhealthy 27 of 365 days1995: Very Unhealthy 1 of 365 days19951996: Good 187 of 366 days1996: Moderate 99 of 366 days1996: Unhealthy for Sensitive Groups 44 of 366 days1996: Unhealthy 33 of 366 days1996: Very Unhealthy 3 of 366 days1997: Good 193 of 365 days1997: Moderate 116 of 365 days1997: Unhealthy for Sensitive Groups 43 of 365 days1997: Unhealthy 12 of 365 days1997: Very Unhealthy 1 of 365 days1998: Good 219 of 365 days1998: Moderate 79 of 365 days1998: Unhealthy for Sensitive Groups 43 of 365 days1998: Unhealthy 17 of 365 days1998: Very Unhealthy 7 of 365 days1999: Good 144 of 365 days1999: Moderate 131 of 365 days1999: Unhealthy for Sensitive Groups 51 of 365 days1999: Unhealthy 35 of 365 days1999: Very Unhealthy 4 of 365 days2000: Good 182 of 366 days2000: Moderate 109 of 366 days2000: Unhealthy for Sensitive Groups 44 of 366 days2000: Unhealthy 29 of 366 days2000: Very Unhealthy 2 of 366 days20002001: Good 156 of 365 days2001: Moderate 123 of 365 days2001: Unhealthy for Sensitive Groups 53 of 365 days2001: Unhealthy 30 of 365 days2001: Very Unhealthy 3 of 365 days2002: Good 165 of 365 days2002: Moderate 99 of 365 days2002: Unhealthy for Sensitive Groups 61 of 365 days2002: Unhealthy 31 of 365 days2002: Very Unhealthy 9 of 365 days2003: Good 165 of 365 days2003: Moderate 116 of 365 days2003: Unhealthy for Sensitive Groups 57 of 365 days2003: Unhealthy 23 of 365 days2003: Very Unhealthy 4 of 365 days2004: Good 178 of 366 days2004: Moderate 127 of 366 days2004: Unhealthy for Sensitive Groups 53 of 366 days2004: Unhealthy 8 of 366 days2005: Good 238 of 365 days2005: Moderate 67 of 365 days2005: Unhealthy for Sensitive Groups 37 of 365 days2005: Unhealthy 23 of 365 days20052006: Good 215 of 365 days2006: Moderate 71 of 365 days2006: Unhealthy for Sensitive Groups 50 of 365 days2006: Unhealthy 27 of 365 days2006: Very Unhealthy 2 of 365 days2007: Good 230 of 365 days2007: Moderate 87 of 365 days2007: Unhealthy for Sensitive Groups 40 of 365 days2007: Unhealthy 7 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 207 of 366 days2008: Moderate 103 of 366 days2008: Unhealthy for Sensitive Groups 39 of 366 days2008: Unhealthy 13 of 366 days2008: Very Unhealthy 4 of 366 days2009: Good 240 of 362 days2009: Moderate 82 of 362 days2009: Unhealthy for Sensitive Groups 33 of 362 days2009: Unhealthy 7 of 362 days2010: Good 250 of 365 days2010: Moderate 90 of 365 days2010: Unhealthy for Sensitive Groups 23 of 365 days2010: Unhealthy 2 of 365 days20102011: Good 234 of 355 days2011: Moderate 80 of 355 days2011: Unhealthy for Sensitive Groups 35 of 355 days2011: Unhealthy 6 of 355 days2012: Good 212 of 366 days2012: Moderate 102 of 366 days2012: Unhealthy for Sensitive Groups 46 of 366 days2012: Unhealthy 6 of 366 days2013: Good 221 of 365 days2013: Moderate 121 of 365 days2013: Unhealthy for Sensitive Groups 23 of 365 days2014: Good 223 of 365 days2014: Moderate 96 of 365 days2014: Unhealthy for Sensitive Groups 43 of 365 days2014: Unhealthy 3 of 365 days2015: Good 238 of 365 days2015: Moderate 103 of 365 days2015: Unhealthy for Sensitive Groups 22 of 365 days2015: Unhealthy 2 of 365 days20152016: Good 221 of 366 days2016: Moderate 102 of 366 days2016: Unhealthy for Sensitive Groups 31 of 366 days2016: Unhealthy 12 of 366 days2017: Good 235 of 362 days2017: Moderate 96 of 362 days2017: Unhealthy for Sensitive Groups 31 of 362 days2018: Good 221 of 365 days2018: Moderate 107 of 365 days2018: Unhealthy for Sensitive Groups 27 of 365 days2018: Unhealthy 9 of 365 days2018: Very Unhealthy 1 of 365 days2019: Good 273 of 365 days2019: Moderate 86 of 365 days2019: Unhealthy for Sensitive Groups 6 of 365 days2020: Good 256 of 366 days2020: Moderate 87 of 366 days2020: Unhealthy for Sensitive Groups 17 of 366 days2020: Unhealthy 6 of 366 days20202021: Good 247 of 365 days2021: Moderate 96 of 365 days2021: Unhealthy for Sensitive Groups 16 of 365 days2021: Unhealthy 4 of 365 days2021: Very Unhealthy 1 of 365 days2021: Hazardous 1 of 365 days2022: Good 258 of 365 days2022: Moderate 93 of 365 days2022: Unhealthy for Sensitive Groups 12 of 365 days2022: Unhealthy 2 of 365 days2023: Good 259 of 365 days2023: Moderate 101 of 365 days2023: Unhealthy for Sensitive Groups 5 of 365 days2024: Good 261 of 366 days2024: Moderate 97 of 366 days2024: Unhealthy for Sensitive Groups 8 of 366 days2025: Good 320 of 365 days2025: Moderate 44 of 365 days2025: Unhealthy for Sensitive Groups 1 of 365 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001502001980: 90th percentile AQI 921981: 90th percentile AQI 1061982: 90th percentile AQI 1161983: 90th percentile AQI 971984: 90th percentile AQI 1031985: 90th percentile AQI 1011986: 90th percentile AQI 941987: 90th percentile AQI 1001988: 90th percentile AQI 971989: 90th percentile AQI 1331990: 90th percentile AQI 871991: 90th percentile AQI 791992: 90th percentile AQI 1401993: 90th percentile AQI 1151994: 90th percentile AQI 1291995: 90th percentile AQI 1331996: 90th percentile AQI 1471997: 90th percentile AQI 1191998: 90th percentile AQI 1331999: 90th percentile AQI 1512000: 90th percentile AQI 1362001: 90th percentile AQI 1472002: 90th percentile AQI 1542003: 90th percentile AQI 1362004: 90th percentile AQI 1122005: 90th percentile AQI 1292006: 90th percentile AQI 1432007: 90th percentile AQI 1122008: 90th percentile AQI 1222009: 90th percentile AQI 1052010: 90th percentile AQI 932011: 90th percentile AQI 1052012: 90th percentile AQI 1052013: 90th percentile AQI 902014: 90th percentile AQI 1052015: 90th percentile AQI 932016: 90th percentile AQI 1052017: 90th percentile AQI 1002018: 90th percentile AQI 1012019: 90th percentile AQI 742020: 90th percentile AQI 902021: 90th percentile AQI 932022: 90th percentile AQI 772023: 90th percentile AQI 772024: 90th percentile AQI 802025: 90th percentile AQI 541980: Median AQI 501981: Median AQI 711982: Median AQI 671983: Median AQI 621984: Median AQI 661985: Median AQI 611986: Median AQI 611987: Median AQI 631988: Median AQI 591989: Median AQI 641990: Median AQI 521991: Median AQI 521992: Median AQI 611993: Median AQI 541994: Median AQI 581995: Median AQI 511996: Median AQI 501997: Median AQI 491998: Median AQI 481999: Median AQI 582000: Median AQI 512001: Median AQI 602002: Median AQI 552003: Median AQI 552004: Median AQI 512005: Median AQI 432006: Median AQI 432007: Median AQI 442008: Median AQI 472009: Median AQI 442010: Median AQI 422011: Median AQI 422012: Median AQI 452013: Median AQI 452014: Median AQI 452015: Median AQI 442016: Median AQI 452017: Median AQI 452018: Median AQI 452019: Median AQI 432020: Median AQI 432021: Median AQI 432022: Median AQI 432023: Median AQI 442024: Median AQI 442025: Median AQI 401980198519901995200020052010201520202025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone364100%
Coarse particles (PM10)1<1%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653204410004054115Ozone
20243662619780004480115Ozone
202336525910150004477119Ozone
202236525893122004377186Ozone
202136524796164114393375Ozone
202036625687176004390190Ozone
20193652738660004374122Ozone
20183652211072791045101203Ozone
2017362235963100045100147Ozone
201636622110231120045105172Ozone
2015365238103222004493166Ozone
2014365223964330045105163Ozone
2013365221121230004590147Ozone
20123662121024660045105177Ozone
2011355234803560042105172Ozone
201036525090232004293192Ozone
2009362240823370044105177Ozone
200836620710339134047122214Ozone
2007365230874071044112201Ozone
20063652157150272043143210Ozone
20053652386737230043129197Ozone
20043661781275380051112192Ozone
200336516511657234055136218Ozone
20023651659961319055154234Ozone
200136515612353303060147204Ozone
200036618210944292051136208Ozone
199936514413151354058151214Ozone
19983652197943177048133223Ozone
199736519311643121049119201Ozone
19963661879944333050147208Ozone
199536517712634271051133208Ozone
199436515113755220058129197Ozone
19933651631504471054115203Ozone
199236613614659232061140207Ozone
1991365162193100005279136Ozone
1990365164187140005287133Ozone
198936511618546162064133205Ozone
1988366124214271005997151Ozone
1987365792503330063100159CO
1986365111234191006194151CO
19853651122162863061101206CO
1984366862423080066103190CO
198336595238244406297218CO
1982365822334172067116220CO
1981365772374290071106200CO
1980366188155212005092153CO

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in California with a similar median AQI in 2025

All monitored counties in California

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem