EnviroNearby

Sacramento County, California air quality history

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

54%
Good days in 2025
49
Median daily AQI, 2025
5
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 Sacramento, California on 365 days. 198 of those days (54%) were in the Good range, and the median daily AQI was 49. That median is higher than the typical monitored county in California (median 45.5 across 46 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 205 days. Across the years with fuller monitoring, the share of Good days rose: an average of 44% in 1980–1982 versus 51% 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 178 of 366 days1980: Moderate 129 of 366 days1980: Unhealthy for Sensitive Groups 30 of 366 days1980: Unhealthy 21 of 366 days1980: Very Unhealthy 8 of 366 days19801981: Good 144 of 365 days1981: Moderate 141 of 365 days1981: Unhealthy for Sensitive Groups 41 of 365 days1981: Unhealthy 28 of 365 days1981: Very Unhealthy 11 of 365 days1982: Good 159 of 365 days1982: Moderate 125 of 365 days1982: Unhealthy for Sensitive Groups 45 of 365 days1982: Unhealthy 26 of 365 days1982: Very Unhealthy 10 of 365 days1983: Good 186 of 365 days1983: Moderate 110 of 365 days1983: Unhealthy for Sensitive Groups 33 of 365 days1983: Unhealthy 26 of 365 days1983: Very Unhealthy 10 of 365 days1984: Good 158 of 366 days1984: Moderate 122 of 366 days1984: Unhealthy for Sensitive Groups 44 of 366 days1984: Unhealthy 29 of 366 days1984: Very Unhealthy 13 of 366 days1985: Good 149 of 365 days1985: Moderate 135 of 365 days1985: Unhealthy for Sensitive Groups 47 of 365 days1985: Unhealthy 21 of 365 days1985: Very Unhealthy 13 of 365 days19851986: Good 166 of 365 days1986: Moderate 121 of 365 days1986: Unhealthy for Sensitive Groups 45 of 365 days1986: Unhealthy 23 of 365 days1986: Very Unhealthy 10 of 365 days1987: Good 128 of 365 days1987: Moderate 131 of 365 days1987: Unhealthy for Sensitive Groups 57 of 365 days1987: Unhealthy 40 of 365 days1987: Very Unhealthy 9 of 365 days1988: Good 128 of 366 days1988: Moderate 126 of 366 days1988: Unhealthy for Sensitive Groups 57 of 366 days1988: Unhealthy 36 of 366 days1988: Very Unhealthy 19 of 366 days1989: Good 111 of 365 days1989: Moderate 139 of 365 days1989: Unhealthy for Sensitive Groups 81 of 365 days1989: Unhealthy 30 of 365 days1989: Very Unhealthy 4 of 365 days1990: Good 122 of 365 days1990: Moderate 175 of 365 days1990: Unhealthy for Sensitive Groups 47 of 365 days1990: Unhealthy 19 of 365 days1990: Very Unhealthy 2 of 365 days19901991: Good 89 of 365 days1991: Moderate 163 of 365 days1991: Unhealthy for Sensitive Groups 74 of 365 days1991: Unhealthy 29 of 365 days1991: Very Unhealthy 10 of 365 days1992: Good 165 of 366 days1992: Moderate 112 of 366 days1992: Unhealthy for Sensitive Groups 56 of 366 days1992: Unhealthy 29 of 366 days1992: Very Unhealthy 4 of 366 days1993: Good 193 of 365 days1993: Moderate 131 of 365 days1993: Unhealthy for Sensitive Groups 30 of 365 days1993: Unhealthy 9 of 365 days1993: Very Unhealthy 2 of 365 days1994: Good 173 of 365 days1994: Moderate 137 of 365 days1994: Unhealthy for Sensitive Groups 33 of 365 days1994: Unhealthy 19 of 365 days1994: Very Unhealthy 3 of 365 days1995: Good 190 of 365 days1995: Moderate 121 of 365 days1995: Unhealthy for Sensitive Groups 25 of 365 days1995: Unhealthy 21 of 365 days1995: Very Unhealthy 8 of 365 days19951996: Good 194 of 366 days1996: Moderate 101 of 366 days1996: Unhealthy for Sensitive Groups 45 of 366 days1996: Unhealthy 21 of 366 days1996: Very Unhealthy 5 of 366 days1997: Good 236 of 365 days1997: Moderate 89 of 365 days1997: Unhealthy for Sensitive Groups 32 of 365 days1997: Unhealthy 6 of 365 days1997: Very Unhealthy 2 of 365 days1998: Good 226 of 365 days1998: Moderate 81 of 365 days1998: Unhealthy for Sensitive Groups 27 of 365 days1998: Unhealthy 22 of 365 days1998: Very Unhealthy 9 of 365 days1999: Good 133 of 365 days1999: Moderate 139 of 365 days1999: Unhealthy for Sensitive Groups 52 of 365 days1999: Unhealthy 36 of 365 days1999: Very Unhealthy 5 of 365 days2000: Good 135 of 366 days2000: Moderate 159 of 366 days2000: Unhealthy for Sensitive Groups 42 of 366 days2000: Unhealthy 29 of 366 days2000: Very Unhealthy 1 of 366 days20002001: Good 121 of 365 days2001: Moderate 163 of 365 days2001: Unhealthy for Sensitive Groups 56 of 365 days2001: Unhealthy 23 of 365 days2001: Very Unhealthy 2 of 365 days2002: Good 80 of 365 days2002: Moderate 182 of 365 days2002: Unhealthy for Sensitive Groups 64 of 365 days2002: Unhealthy 34 of 365 days2002: Very Unhealthy 5 of 365 days2003: Good 81 of 365 days2003: Moderate 197 of 365 days2003: Unhealthy for Sensitive Groups 57 of 365 days2003: Unhealthy 25 of 365 days2003: Very Unhealthy 5 of 365 days2004: Good 77 of 366 days2004: Moderate 216 of 366 days2004: Unhealthy for Sensitive Groups 63 of 366 days2004: Unhealthy 10 of 366 days2005: Good 92 of 365 days2005: Moderate 205 of 365 days2005: Unhealthy for Sensitive Groups 40 of 365 days2005: Unhealthy 24 of 365 days2005: Very Unhealthy 4 of 365 days20052006: Good 80 of 365 days2006: Moderate 192 of 365 days2006: Unhealthy for Sensitive Groups 57 of 365 days2006: Unhealthy 33 of 365 days2006: Very Unhealthy 3 of 365 days2007: Good 78 of 365 days2007: Moderate 217 of 365 days2007: Unhealthy for Sensitive Groups 55 of 365 days2007: Unhealthy 14 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 108 of 366 days2008: Moderate 185 of 366 days2008: Unhealthy for Sensitive Groups 47 of 366 days2008: Unhealthy 19 of 366 days2008: Very Unhealthy 7 of 366 days2009: Good 142 of 365 days2009: Moderate 160 of 365 days2009: Unhealthy for Sensitive Groups 41 of 365 days2009: Unhealthy 22 of 365 days2010: Good 161 of 365 days2010: Moderate 176 of 365 days2010: Unhealthy for Sensitive Groups 20 of 365 days2010: Unhealthy 7 of 365 days2010: Very Unhealthy 1 of 365 days20102011: Good 114 of 365 days2011: Moderate 182 of 365 days2011: Unhealthy for Sensitive Groups 53 of 365 days2011: Unhealthy 16 of 365 days2012: Good 152 of 366 days2012: Moderate 157 of 366 days2012: Unhealthy for Sensitive Groups 46 of 366 days2012: Unhealthy 10 of 366 days2012: Very Unhealthy 1 of 366 days2013: Good 131 of 365 days2013: Moderate 200 of 365 days2013: Unhealthy for Sensitive Groups 32 of 365 days2013: Unhealthy 2 of 365 days2014: Good 133 of 365 days2014: Moderate 192 of 365 days2014: Unhealthy for Sensitive Groups 40 of 365 days2015: Good 101 of 365 days2015: Moderate 237 of 365 days2015: Unhealthy for Sensitive Groups 24 of 365 days2015: Unhealthy 3 of 365 days20152016: Good 136 of 366 days2016: Moderate 191 of 366 days2016: Unhealthy for Sensitive Groups 33 of 366 days2016: Unhealthy 6 of 366 days2017: Good 105 of 365 days2017: Moderate 225 of 365 days2017: Unhealthy for Sensitive Groups 33 of 365 days2017: Unhealthy 2 of 365 days2018: Good 104 of 365 days2018: Moderate 226 of 365 days2018: Unhealthy for Sensitive Groups 22 of 365 days2018: Unhealthy 6 of 365 days2018: Very Unhealthy 5 of 365 days2018: Hazardous 2 of 365 days2019: Good 175 of 365 days2019: Moderate 180 of 365 days2019: Unhealthy for Sensitive Groups 10 of 365 days2020: Good 145 of 366 days2020: Moderate 185 of 366 days2020: Unhealthy for Sensitive Groups 17 of 366 days2020: Unhealthy 16 of 366 days2020: Very Unhealthy 3 of 366 days20202021: Good 146 of 365 days2021: Moderate 183 of 365 days2021: Unhealthy for Sensitive Groups 30 of 365 days2021: Unhealthy 4 of 365 days2021: Very Unhealthy 1 of 365 days2021: Hazardous 1 of 365 days2022: Good 162 of 365 days2022: Moderate 184 of 365 days2022: Unhealthy for Sensitive Groups 17 of 365 days2022: Unhealthy 2 of 365 days2023: Good 180 of 365 days2023: Moderate 173 of 365 days2023: Unhealthy for Sensitive Groups 12 of 365 days2024: Good 182 of 366 days2024: Moderate 169 of 366 days2024: Unhealthy for Sensitive Groups 15 of 366 days2025: Good 198 of 365 days2025: Moderate 162 of 365 days2025: Unhealthy for Sensitive Groups 5 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 1261981: 90th percentile AQI 1541982: 90th percentile AQI 1501983: 90th percentile AQI 1501984: 90th percentile AQI 1691985: 90th percentile AQI 1431986: 90th percentile AQI 1501987: 90th percentile AQI 1611988: 90th percentile AQI 1641989: 90th percentile AQI 1431990: 90th percentile AQI 1231991: 90th percentile AQI 1511992: 90th percentile AQI 1401993: 90th percentile AQI 1051994: 90th percentile AQI 1331995: 90th percentile AQI 1431996: 90th percentile AQI 1401997: 90th percentile AQI 1051998: 90th percentile AQI 1431999: 90th percentile AQI 1542000: 90th percentile AQI 1432001: 90th percentile AQI 1432002: 90th percentile AQI 1532003: 90th percentile AQI 1442004: 90th percentile AQI 1222005: 90th percentile AQI 1342006: 90th percentile AQI 1492007: 90th percentile AQI 1262008: 90th percentile AQI 1402009: 90th percentile AQI 1292010: 90th percentile AQI 972011: 90th percentile AQI 1292012: 90th percentile AQI 1192013: 90th percentile AQI 1002014: 90th percentile AQI 1052015: 90th percentile AQI 932016: 90th percentile AQI 1012017: 90th percentile AQI 1002018: 90th percentile AQI 1002019: 90th percentile AQI 842020: 90th percentile AQI 1002021: 90th percentile AQI 1002022: 90th percentile AQI 932023: 90th percentile AQI 862024: 90th percentile AQI 842025: 90th percentile AQI 721980: Median AQI 541981: Median AQI 581982: Median AQI 571983: Median AQI 491984: Median AQI 571985: Median AQI 581986: Median AQI 571987: Median AQI 671988: Median AQI 681989: Median AQI 771990: Median AQI 671991: Median AQI 711992: Median AQI 571993: Median AQI 491994: Median AQI 541995: Median AQI 501996: Median AQI 491997: Median AQI 441998: Median AQI 451999: Median AQI 602000: Median AQI 582001: Median AQI 612002: Median AQI 752003: Median AQI 692004: Median AQI 642005: Median AQI 632006: Median AQI 672007: Median AQI 632008: Median AQI 632009: Median AQI 582010: Median AQI 532011: Median AQI 602012: Median AQI 562013: Median AQI 582014: Median AQI 552015: Median AQI 582016: Median AQI 552017: Median AQI 602018: Median AQI 582019: Median AQI 522020: Median AQI 552021: Median AQI 552022: Median AQI 532023: Median AQI 512024: Median AQI 512025: Median AQI 491980198519901995200020052010201520202025
  • 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
Ozone20556%
Fine particles (PM2.5)16044%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536519816250004972122Ozone
2024366182169150005184140Ozone
2023365180173120005186133Ozone
2022365162184172005393164Ozone
20213651461833041155100381Ozone
202036614518517163055100226PM2.5
2019365175180100005284140Ozone
20183651042262265258100376PM2.5
20173651052253320060100164PM2.5
20163661361913360055101172PM2.5
2015365101237243005893172PM2.5
20143651331924000055105147Ozone
20133651312003220058100154PM2.5
201236615215746101056119201Ozone
201136511418253160060129182PM2.5
2010365161176207105397207Ozone
200936514216041220058129197Ozone
200836610818547197063140219Ozone
20073657821755141063126218PM2.5
20063658019257333067149207PM2.5
20053659220540244063134213PM2.5
20043667721663100064122172PM2.5
20033658119757255069144214Ozone
20023658018264345075153216Ozone
200136512116356232061143203Ozone
200036613515942291058143203Ozone
199936513313952365060154225Ozone
19983652268127229045143234Ozone
1997365236893262044105202Ozone
199636619410145215049140222Ozone
199536519012125218050143224Ozone
199436517313733193054133217Ozone
19933651931313092049105214Ozone
199236616511256294057140218Ozone
199136589163742910071151237Ozone
199036512217547192067123203Ozone
198936511113981304077143229Ozone
1988366128126573619068164226Ozone
198736512813157409067161223Ozone
1986365166121452310057150221Ozone
1985365149135472113058143259Ozone
1984366158122442913057169235Ozone
1983365186110332610049150221Ozone
1982365159125452610057150229Ozone
1981365144141412811058154239Ozone
198036617812930218054126228Ozone

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