Bad Air Days in Mohave County, Arizona: under 1 a Year
under 1 bad air day a year
Rare: among the cleanest-air counties EPA monitors. Ranked 780 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (100% particle days).
When the bad days come in Mohave
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in September and July and May. Averaged over 2016 to 2025.
Is a purifier worth it here?
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
The record for Mohave
The worst recent year was 2025, with 2 bad days on 349 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2025-09-02 | 331 | PM10 |
| 2025-09-03 | 187 | PM10 |
| 2021-07-11 | 156 | PM10 |
| 2020-09-08 | 116 | PM10 |
| 2022-05-29 | 115 | PM10 |
The air on a normal day
Across 3,572 monitored days from 2016 to 2025, the air in Mohave County rated Good on 97% of them, more often than the 72% typical of monitored counties, and Moderate on 3%. The median day sat at AQI 17; one day in ten went above 33.
The pollutant setting the AQI on an ordinary day here:
- coarse dust (PM10)92%3,273 days
- fine particles (PM2.5)8%299 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 349 | 331 | 16 | 2 | 2 | 17 | 331 |
| 2024 | 352 | 347 | 5 | 0 | 0 | 19 | 69 |
| 2023 | 353 | 344 | 9 | 0 | 0 | 15 | 99 |
| 2022 | 357 | 340 | 16 | 1 | 0 | 17 | 115 |
| 2021 | 363 | 360 | 2 | 1 | 1 | 19 | 156 |
| 2020 | 358 | 348 | 9 | 1 | 0 | 19 | 116 |
| 2019 | 365 | 358 | 7 | 0 | 0 | 14 | 69 |
| 2018 | 363 | 349 | 13 | 1 | 0 | 18 | 105 |
| 2017 | 355 | 349 | 6 | 0 | 0 | 17 | 86 |
| 2016 | 357 | 334 | 23 | 0 | 0 | 19 | 83 |
| 2015 | 364 | 350 | 14 | 0 | 0 | 17 | 62 |
| 2014 | 365 | 355 | 10 | 0 | 0 | 19 | 77 |
| 2013 | 358 | 339 | 18 | 1 | 0 | 18 | 127 |
| 2012 | 240 | 232 | 7 | 1 | 0 | 20 | 116 |
| 2011 | 108 | 105 | 3 | 0 | 0 | 18 | 89 |
| 2010 | 118 | 117 | 1 | 0 | 0 | 16 | 51 |
*2025 may be a partial year in EPA's file.
Elsewhere in Arizona
- Maricopa County89/yr
- Pinal County53/yr
- Gila County14/yr
- Pima County9/yr
- Yuma County9/yr
- Santa Cruz County3/yr
- Cochise County3/yr
- La Paz County2/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.