EnviroNearby

Yuma County, Arizona air quality history

Daily Air Quality Index summaries from EPA monitors in Yuma, Arizona, 1980–2025.

54%
Good days in 2025
48
Median daily AQI, 2025
7
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 Yuma, Arizona on 365 days. 197 of those days (54%) were in the Good range, and the median daily AQI was 48. That median is about the same as the typical monitored county in Arizona (median 47 across 13 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 196 days. Across the years with fuller monitoring, the share of Good days fell: an average of 81% in 1980–1982 versus 56% in 2023–2025.

Years with fewer than 120 monitored days (1990, 1992, 1993, 1994, 1996, 2002) are shown in the table but left out of comparisons and trend statements.

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 191 of 270 days1980: Moderate 50 of 270 days1980: Unhealthy for Sensitive Groups 21 of 270 days1980: Unhealthy 8 of 270 days19801981: Good 303 of 356 days1981: Moderate 42 of 356 days1981: Unhealthy for Sensitive Groups 11 of 356 days1982: Good 251 of 292 days1982: Moderate 35 of 292 days1982: Unhealthy for Sensitive Groups 6 of 292 days1983: Good 267 of 316 days1983: Moderate 36 of 316 days1983: Unhealthy for Sensitive Groups 11 of 316 days1983: Unhealthy 2 of 316 days1984: Good 264 of 319 days1984: Moderate 47 of 319 days1984: Unhealthy for Sensitive Groups 7 of 319 days1984: Unhealthy 1 of 319 days1985: Good 258 of 322 days1985: Moderate 53 of 322 days1985: Unhealthy for Sensitive Groups 7 of 322 days1985: Unhealthy 4 of 322 days19851986: Good 115 of 177 days1986: Moderate 53 of 177 days1986: Unhealthy for Sensitive Groups 7 of 177 days1986: Unhealthy 2 of 177 days1987: Good 115 of 190 days1987: Moderate 60 of 190 days1987: Unhealthy for Sensitive Groups 12 of 190 days1987: Unhealthy 3 of 190 days1988: Good 111 of 191 days1988: Moderate 69 of 191 days1988: Unhealthy for Sensitive Groups 10 of 191 days1988: Unhealthy 1 of 191 days1989: Good 111 of 162 days1989: Moderate 36 of 162 days1989: Unhealthy for Sensitive Groups 15 of 162 days1990: Good 70 of 103 days1990: Moderate 25 of 103 days1990: Unhealthy for Sensitive Groups 8 of 103 days19901991: Good 116 of 166 days1991: Moderate 46 of 166 days1991: Unhealthy for Sensitive Groups 4 of 166 days1992: Good 51 of 53 days1992: Moderate 2 of 53 days1993: Good 94 of 98 days1993: Moderate 4 of 98 days1994: Good 36 of 37 days1994: Moderate 1 of 37 days1995: Good 148 of 186 days1995: Moderate 33 of 186 days1995: Unhealthy for Sensitive Groups 5 of 186 days19951996: Good 49 of 99 days1996: Moderate 33 of 99 days1996: Unhealthy for Sensitive Groups 17 of 99 days1997: Good 149 of 245 days1997: Moderate 81 of 245 days1997: Unhealthy for Sensitive Groups 15 of 245 days1998: Good 109 of 199 days1998: Moderate 72 of 199 days1998: Unhealthy for Sensitive Groups 14 of 199 days1998: Unhealthy 4 of 199 days1999: Good 168 of 244 days1999: Moderate 60 of 244 days1999: Unhealthy for Sensitive Groups 15 of 244 days1999: Unhealthy 1 of 244 days2000: Good 179 of 206 days2000: Moderate 27 of 206 days20002001: Good 154 of 191 days2001: Moderate 34 of 191 days2001: Unhealthy for Sensitive Groups 3 of 191 days2002: Good 35 of 50 days2002: Moderate 14 of 50 days2002: Unhealthy for Sensitive Groups 1 of 50 days2003: Good 150 of 225 days2003: Moderate 63 of 225 days2003: Unhealthy for Sensitive Groups 11 of 225 days2003: Unhealthy 1 of 225 days2004: Good 192 of 265 days2004: Moderate 64 of 265 days2004: Unhealthy for Sensitive Groups 9 of 265 days2005: Good 188 of 316 days2005: Moderate 113 of 316 days2005: Unhealthy for Sensitive Groups 15 of 316 days20052006: Good 187 of 365 days2006: Moderate 164 of 365 days2006: Unhealthy for Sensitive Groups 14 of 365 days2007: Good 205 of 365 days2007: Moderate 140 of 365 days2007: Unhealthy for Sensitive Groups 17 of 365 days2007: Unhealthy 3 of 365 days2008: Good 209 of 360 days2008: Moderate 127 of 360 days2008: Unhealthy for Sensitive Groups 23 of 360 days2008: Very Unhealthy 1 of 360 days2009: Good 239 of 363 days2009: Moderate 115 of 363 days2009: Unhealthy for Sensitive Groups 8 of 363 days2009: Unhealthy 1 of 363 days2010: Good 259 of 358 days2010: Moderate 91 of 358 days2010: Unhealthy for Sensitive Groups 8 of 358 days20102011: Good 251 of 363 days2011: Moderate 98 of 363 days2011: Unhealthy for Sensitive Groups 14 of 363 days2012: Good 224 of 366 days2012: Moderate 116 of 366 days2012: Unhealthy for Sensitive Groups 24 of 366 days2012: Unhealthy 2 of 366 days2013: Good 231 of 365 days2013: Moderate 124 of 365 days2013: Unhealthy for Sensitive Groups 9 of 365 days2013: Hazardous 1 of 365 days2014: Good 204 of 365 days2014: Moderate 144 of 365 days2014: Unhealthy for Sensitive Groups 12 of 365 days2014: Unhealthy 3 of 365 days2014: Very Unhealthy 2 of 365 days2015: Good 252 of 365 days2015: Moderate 99 of 365 days2015: Unhealthy for Sensitive Groups 13 of 365 days2015: Very Unhealthy 1 of 365 days20152016: Good 199 of 366 days2016: Moderate 153 of 366 days2016: Unhealthy for Sensitive Groups 12 of 366 days2016: Unhealthy 1 of 366 days2016: Hazardous 1 of 366 days2017: Good 201 of 365 days2017: Moderate 150 of 365 days2017: Unhealthy for Sensitive Groups 12 of 365 days2017: Unhealthy 1 of 365 days2017: Very Unhealthy 1 of 365 days2018: Good 202 of 365 days2018: Moderate 147 of 365 days2018: Unhealthy for Sensitive Groups 15 of 365 days2018: Unhealthy 1 of 365 days2019: Good 226 of 365 days2019: Moderate 136 of 365 days2019: Unhealthy for Sensitive Groups 3 of 365 days2020: Good 206 of 366 days2020: Moderate 157 of 366 days2020: Unhealthy for Sensitive Groups 2 of 366 days2020: Hazardous 1 of 366 days20202021: Good 186 of 365 days2021: Moderate 173 of 365 days2021: Unhealthy for Sensitive Groups 5 of 365 days2021: Unhealthy 1 of 365 days2022: Good 228 of 365 days2022: Moderate 128 of 365 days2022: Unhealthy for Sensitive Groups 9 of 365 days2023: Good 204 of 365 days2023: Moderate 150 of 365 days2023: Unhealthy for Sensitive Groups 6 of 365 days2023: Unhealthy 4 of 365 days2023: Hazardous 1 of 365 days2024: Good 212 of 365 days2024: Moderate 149 of 365 days2024: Unhealthy for Sensitive Groups 3 of 365 days2024: Unhealthy 1 of 365 days2025: Good 197 of 365 days2025: Moderate 161 of 365 days2025: Unhealthy for Sensitive Groups 6 of 365 days2025: Very Unhealthy 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 year0501001501980: 90th percentile AQI 1051981: 90th percentile AQI 611982: 90th percentile AQI 611983: 90th percentile AQI 671984: 90th percentile AQI 711985: 90th percentile AQI 671986: 90th percentile AQI 801987: 90th percentile AQI 1001988: 90th percentile AQI 931989: 90th percentile AQI 931990: 90th percentile AQI 971991: 90th percentile AQI 771992: 90th percentile AQI 461993: 90th percentile AQI 361994: 90th percentile AQI 471995: 90th percentile AQI 641996: 90th percentile AQI 1151997: 90th percentile AQI 911998: 90th percentile AQI 1001999: 90th percentile AQI 872000: 90th percentile AQI 562001: 90th percentile AQI 702002: 90th percentile AQI 792003: 90th percentile AQI 842004: 90th percentile AQI 802005: 90th percentile AQI 802006: 90th percentile AQI 742007: 90th percentile AQI 782008: 90th percentile AQI 872009: 90th percentile AQI 692010: 90th percentile AQI 802011: 90th percentile AQI 802012: 90th percentile AQI 902013: 90th percentile AQI 772014: 90th percentile AQI 842015: 90th percentile AQI 772016: 90th percentile AQI 772017: 90th percentile AQI 732018: 90th percentile AQI 802019: 90th percentile AQI 672020: 90th percentile AQI 702021: 90th percentile AQI 712022: 90th percentile AQI 732023: 90th percentile AQI 742024: 90th percentile AQI 742025: 90th percentile AQI 691980: Median AQI 291981: Median AQI 281982: Median AQI 301983: Median AQI 31984: Median AQI 51985: Median AQI 311986: Median AQI 451987: Median AQI 461988: Median AQI 481989: Median AQI 441990: Median AQI 401991: Median AQI 421992: Median AQI 241993: Median AQI 01994: Median AQI 301995: Median AQI 371996: Median AQI 511997: Median AQI 441998: Median AQI 491999: Median AQI 422000: Median AQI 382001: Median AQI 402002: Median AQI 412003: Median AQI 442004: Median AQI 432005: Median AQI 462006: Median AQI 502007: Median AQI 482008: Median AQI 462009: Median AQI 452010: Median AQI 412011: Median AQI 412012: Median AQI 472013: Median AQI 452014: Median AQI 492015: Median AQI 442016: Median AQI 492017: Median AQI 492018: Median AQI 492019: Median AQI 472020: Median AQI 492021: Median AQI 502022: Median AQI 462023: Median AQI 482024: Median AQI 472025: Median AQI 481980198519901995200020052010201520202025
  • 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
Ozone19654%
Coarse particles (PM10)10228%
Fine particles (PM2.5)6718%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536519716160104869211Ozone
202436521214931004774179Ozone
202336520415064014874519Ozone
202236522812890004673142Ozone
202136518617351005071170Ozone
202036620615720014970319Ozone
201936522613630004767129Ozone
2018365202147151004980169Ozone
2017365201150121104973235Ozone
2016366199153121014977410Ozone
201536525299130104477266Ozone
2014365204144123204984284Ozone
201336523112490014577540Ozone
2012366224116242004790166Ozone
201136325198140004180140Ozone
20103582599180004180147Ozone
200936323911581004569176PM10
2008360209127230104687245PM10
2007365205140173004878198PM10
2006365187164140005074146Ozone
2005316188113150004680140Ozone
20042651926490004380115Ozone
200322515063111004484164Ozone
200250351410004179108PM10
20011911543430004070140Ozone
2000206179270000385693Ozone
199924416860151004287154Ozone
1998199109721440049100174Ozone
199724514981150004491147Ozone
19969949331700051115150Ozone
19951861483350003764143Ozone
1994373610000304756PM10
199398944000003656Ozone
1992535120000244654PM10
19911661164640004277138Ozone
1990103702580004097147Ozone
198916211136150004493150Ozone
198819111169101004893151Ozone
1987190115601230046100172Ozone
19861771155372004580161Ozone
19853222585374003167169CO
1984319264477100571185CO
19833162673611200367169CO
19822922513560003061129Ozone
198135630342110002861136Ozone
1980270191502180029105182CO

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 Arizona with a similar median AQI in 2025

All monitored counties in Arizona

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