Median AQI
19
Good
Arizona · County air quality · 2025
Mohave County, Arizona
Median AQI 19 (Good). 93.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 19
- Median AQI
- 93.4%
- Good-air days
- 2
- Unhealthy days
- 84%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Mohave County's air is good on balance, cleaner than most US counties, a median AQI of 19 with 93.4% of 271 monitored days in the Good band, driven mainly by PM10.
- 19
- median AQI · Good
- 93.4%
- days rated Good
- PM10
- main pollutant
- 84%
- cleaner than US counties
2 days reached Unhealthy or worse; the worst single reading hit AQI 331.
Data updated July 2026
- Good · 253 d · 93.4%
- Moderate · 16 d · 5.9%
- Unhealthy · 1 d · 0.4%
- Hazardous · 1 d · 0.4%
How did Mohave County's air break down in 2025?
Across 271 monitored days, 253 fell in the Good band (AQI 0–50) and 2 reached Unhealthy or worse. The worst single day peaked at AQI 331 (Hazardous).
EPA AQS →Air quality data from EPA Air Quality System (2025). 271 days monitored. Median AQI: 19 (Good).
Insights: Mohave County, Arizona. EPA monitors recorded a median Air Quality Index of 19 across 271 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 253 (93%) fell in the Good band (AQI 0–50), 16 (6%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 44, while the worst single-day peak hit 331 (Hazardous). Residents averaged about 28.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM10 (243 days), PM2.5 (28 days). Across the 2020–2025 trend window, good days shifted by -95 and the median AQI moved +0 points, placing the multi-year trajectory at worsening. Residents and visitors experienced 2 unhealthy-or-worse days combined, periods when the EPA recommends sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Apache (99.6% good, AQI 14); Cochise (65.6% good, AQI 46); Coconino (62.5% good, AQI 48); Gila (52.0% good, AQI 50); La Paz (68.6% good, AQI 47); Maricopa (16.4% good, AQI 71).
Air Quality Summary
Good Days
93.4%
253 of 271 monitored days
18.4pp vs 75% target
Max AQI Recorded
331
Hazardous
Health Grade
Excellent
90th-pct AQI 44
Mohave County, Good days share 93.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Mohave County, Unhealthy-or-worse share 0.7%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 271 monitored days across EPA AQI categories.
Good
253
93%
Moderate
16
6%
USG
0
0%
Unhealthy
1
0%
Very Unhealthy
0
0%
Hazardous
1
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Mohave County.
- PM10 · 243 days · 89.7%
- PM2.5 · 28 days · 10.3%
Health Impact Assessment
Excellent
Mohave County's air quality is rated Excellent based on 93.4% good air days. There were 2 unhealthy days in 2025 when outdoor activity should be limited.
Air quality posed significant health risk in 2025. Sensitive groups, including people with asthma, COPD, cardiovascular conditions, children, pregnant women, and adults over 65, should monitor AirNow.gov alerts and limit outdoor activity on Unhealthy (AQI 151+) and Very Unhealthy (201+) days. Peak readings reached AQI 331, well into the Hazardous range.
Sensitive group advisory
People with asthma, COPD, heart disease, children, pregnant women, and adults 65+ should follow EPA AQI alerts daily and limit outdoor exertion when AQI exceeds 100. Real-time conditions: airnow.gov.
The dominant pollutant is PM10, driving AQI on 243 of 271 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Mohave County. Best year: 2021 (360 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 348 | 9 | 1 | 0 | 19 | 116 |
| 2021 | 360 | 2 | 0 | 1 | 19 | 156 |
| 2022 | 340 | 16 | 1 | 0 | 17 | 115 |
| 2023 | 344 | 9 | 0 | 0 | 15 | 99 |
| 2024 | 347 | 5 | 0 | 0 | 19 | 69 |
| 2025 | 253 | 16 | 0 | 1 | 19 | 331 |
How does Mohave County compare?
How Mohave County compares
Good-day share better than US avg
Mohave County 93.4%
Apache County, Arizona 99.6%
US average 76.5%
Median AQI better than US avg
Mohave County 19
Apache County, Arizona 14
US average 38
Unhealthy days / yr worse than US avg
Mohave County 2
Apache County, Arizona 0
US average 0
Other Counties in Arizona
Air quality comparison for nearby counties in Arizona.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Mohave County.
Adams County, Washington
AQI 19 · 94.7% good
Bonneville County, Idaho
AQI 19 · 94.9% good
Elko County, Nevada
AQI 19 · 90.8% good
Grays Harbor County, Washington
AQI 19 · 97.9% good
Jefferson County, Washington
AQI 19 · 96.5% good
Luna County, New Mexico
AQI 19 · 79.5% good
What Mohave County's air means for you
On most days the air here is fine, but PM10 drives 2 unhealthy-or-worse days a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM10 days, the guide explains what a median of 19 means for exposure. Health guidance
- See how Mohave County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Mohave County with its Arizona neighbours before drawing a conclusion about the region. All of Arizona
Based on 271 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Mohave County, Arizona? ▼
Mohave County has a median Air Quality Index (AQI) of 19, rated "Good." 93.4% of monitored days (253 out of 271) had good air quality in 2025.
What is the main pollutant in Mohave County? ▼
The primary pollutant in Mohave County is Coarse Particles (PM10), which was the main AQI driver on 243 days (90% of monitored days). Irritates airways and can aggravate asthma and bronchitis.
How many unhealthy air days does Mohave County have? ▼
In 2025, Mohave County recorded 2 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 1 Hazardous). The maximum AQI reached 331.
Is the air quality in Mohave County getting better or worse? ▼
Air quality in Mohave County is worsening based on 5-year trends (2020-2025). Best year: 2021 with 360 good days. Worst year: 2025 with 253 good days.
What does AQI 19 mean for health? ▼
Mohave County's median AQI of 19 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Mohave County compare to other counties in Arizona? ▼
Mohave County has 93.4% good air days. Nearby counties in Arizona: Apache (99.6% good), Cochise (65.6% good), Coconino (62.5% good), Gila (52.0% good), La Paz (68.6% good), Maricopa (16.4% good).
What is the 90th percentile AQI in Mohave County? ▼
The 90th percentile AQI for Mohave County is 44, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 331 (Hazardous).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.