EnviroNearby

Mohave County, Arizona air quality history

Daily Air Quality Index summaries from EPA monitors in Mohave, Arizona, 1991–2025.

95%
Good days in 2025
17
Median daily AQI, 2025
2
Days above 100 in 2025
349
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Mohave, Arizona on 349 days. 331 of those days (95%) were in the Good range, and the median daily AQI was 17. That median is lower than the typical monitored county in Arizona (median 47 across 13 counties), and lower than the typical monitored U.S. county (40). The main pollutant was coarse particles (PM10) on 317 days. Across the years with fuller monitoring, the share of Good days rose: an average of 91% in 2004–2006 versus 97% in 2023–2025.

Years with fewer than 120 monitored days (2002, 2003, 2008, 2009, 2010, 2011…) 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%1991: Good 31 of 31 days19911992: Good 32 of 32 days1996: Good 60 of 61 days1996: Moderate 1 of 61 days1997: Good 55 of 57 days1997: Moderate 2 of 57 days1998: Good 59 of 61 days1998: Moderate 2 of 61 days1999: Good 57 of 60 days1999: Moderate 3 of 60 days19992000: Good 54 of 62 days2000: Moderate 8 of 62 days2001: Good 71 of 73 days2001: Moderate 2 of 73 days2002: Good 45 of 60 days2002: Moderate 15 of 60 days2003: Good 92 of 103 days2003: Moderate 11 of 103 days2004: Good 115 of 122 days2004: Moderate 7 of 122 days20042005: Good 110 of 120 days2005: Moderate 10 of 120 days2006: Good 107 of 122 days2006: Moderate 15 of 122 days2007: Good 99 of 120 days2007: Moderate 20 of 120 days2007: Unhealthy for Sensitive Groups 1 of 120 days2008: Good 91 of 117 days2008: Moderate 26 of 117 days2009: Good 91 of 111 days2009: Moderate 20 of 111 days20092010: Good 117 of 118 days2010: Moderate 1 of 118 days2011: Good 105 of 108 days2011: Moderate 3 of 108 days2012: Good 232 of 240 days2012: Moderate 7 of 240 days2012: Unhealthy for Sensitive Groups 1 of 240 days2013: Good 339 of 358 days2013: Moderate 18 of 358 days2013: Unhealthy for Sensitive Groups 1 of 358 days2014: Good 355 of 365 days2014: Moderate 10 of 365 days20142015: Good 350 of 364 days2015: Moderate 14 of 364 days2016: Good 334 of 357 days2016: Moderate 23 of 357 days2017: Good 349 of 355 days2017: Moderate 6 of 355 days2018: Good 349 of 363 days2018: Moderate 13 of 363 days2018: Unhealthy for Sensitive Groups 1 of 363 days2019: Good 358 of 365 days2019: Moderate 7 of 365 days20192020: Good 348 of 358 days2020: Moderate 9 of 358 days2020: Unhealthy for Sensitive Groups 1 of 358 days2021: Good 360 of 363 days2021: Moderate 2 of 363 days2021: Unhealthy 1 of 363 days2022: Good 340 of 357 days2022: Moderate 16 of 357 days2022: Unhealthy for Sensitive Groups 1 of 357 days2023: Good 344 of 353 days2023: Moderate 9 of 353 days2024: Good 347 of 352 days2024: Moderate 5 of 352 days20242025: Good 331 of 349 days2025: Moderate 16 of 349 days2025: Unhealthy 1 of 349 days2025: Hazardous 1 of 349 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 year0501001991: 90th percentile AQI 291992: 90th percentile AQI 361996: 90th percentile AQI 361997: 90th percentile AQI 361998: 90th percentile AQI 371999: 90th percentile AQI 432000: 90th percentile AQI 512001: 90th percentile AQI 442002: 90th percentile AQI 622003: 90th percentile AQI 512004: 90th percentile AQI 422005: 90th percentile AQI 482006: 90th percentile AQI 512007: 90th percentile AQI 552008: 90th percentile AQI 592009: 90th percentile AQI 572010: 90th percentile AQI 282011: 90th percentile AQI 332012: 90th percentile AQI 372013: 90th percentile AQI 382014: 90th percentile AQI 322015: 90th percentile AQI 342016: 90th percentile AQI 422017: 90th percentile AQI 312018: 90th percentile AQI 352019: 90th percentile AQI 292020: 90th percentile AQI 362021: 90th percentile AQI 342022: 90th percentile AQI 322023: 90th percentile AQI 272024: 90th percentile AQI 302025: 90th percentile AQI 341991: Median AQI 211992: Median AQI 241996: Median AQI 211997: Median AQI 211998: Median AQI 221999: Median AQI 282000: Median AQI 312001: Median AQI 252002: Median AQI 272003: Median AQI 242004: Median AQI 242005: Median AQI 242006: Median AQI 282007: Median AQI 292008: Median AQI 282009: Median AQI 232010: Median AQI 162011: Median AQI 182012: Median AQI 202013: Median AQI 182014: Median AQI 192015: Median AQI 172016: Median AQI 192017: Median AQI 172018: Median AQI 182019: Median AQI 142020: Median AQI 192021: Median AQI 192022: Median AQI 172023: Median AQI 152024: Median AQI 192025: Median AQI 1719911999200420092014201920242025
  • 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
Coarse particles (PM10)31791%
Fine particles (PM2.5)329%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253493311601011734331PM10
202435234750000193069PM10
202335334490000152799PM10
20223573401610001732115PM10
2021363360201001934156PM10
2020358348910001936116PM10
201936535870000142969PM10
20183633491310001835105PM10
201735534960000173186PM10
2016357334230000194283PM10
2015364350140000173462PM10
2014365355100000193277PM10
20133583391810001838127PM10
2012240232710002037116PM10
201110810530000183389PM2.5
201011811710000162851PM2.5
200911191200000235775PM2.5
200811791260000285970PM2.5
2007120992010002955121PM2.5
2006122107150000285176PM2.5
2005120110100000244872PM2.5
200412211570000244286PM2.5
200310392110000245184PM2.5
20026045150000276299PM2.5
2001737120000254473PM10
2000625480000315165PM10
1999605730000284393PM10
1998615920000223762PM10
1997575520000213652PM10
1996616010000213664PM10
1992323200000243645PM2.5
1991313100000212936PM2.5

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 1991–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem