Median AQI
17
Good
Arizona · County air quality · 2025
Mohave County, Arizona
Median AQI 17 (Good). 94.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 17
- Median AQI
- 94.8%
- Good-air days
- 2
- Unhealthy days
- 92%
- Cleaner than US counties
Mohave County's 2025 annual median AQI is 17 (Good), with 94.8% Good days
According to the U.S. EPA Air Quality System, Mohave County, Arizona posted a 2025 median AQI of 17 (Good) across 349 monitored days, with 94.8% rated Good and 2 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Mohave County's 94.8% Good-day share places it cleaner than 92% of US counties in 2025.
- Closest median-AQI peer
- Blaine County (96.6% Good, median AQI 17) is the closest nationwide median-AQI peer to Mohave County.
- 2020–2025 trend
- Mohave County's floor-qualifying Good-day share is stable from 2020 to 2025 (97.2% → 95.1%).
- Median AQI
- Median AQI: 17
The verdict
According to EPA Air Quality System monitoring data, Mohave County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 17 with 94.8% of 349 monitored days in the Good band, driven mainly by PM10.
- 17
- median AQI · Good
- 94.8%
- days rated Good
- PM10
- main pollutant
- 92%
- cleaner than US counties
2 days reached Unhealthy or worse; the worst single reading hit AQI 331.
Annual release change
What changed in the 2025 EPA annual release
- Mohave County's peak single-day AQI rose from 69 to 331 between the 2024 and 2025 EPA annual releases, a change of +262 points.
- Mohave County's Good-day share fell from 98.6% to 94.8% between the 2024 and 2025 EPA annual releases, a change of -3.7 percentage points.
- Mohave County's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.
Data updated August 2026
- Good · 331 d · 94.8%
- Moderate · 16 d · 4.6%
- Unhealthy · 1 d · 0.3%
- Hazardous · 1 d · 0.3%
How did Mohave County's air break down in 2025?
Across 349 monitored days, 331 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). 349 days monitored. Median AQI: 17 (Good).
Insights: Mohave County, Arizona. EPA monitors recorded a median Air Quality Index of 17 across 349 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 331 (95%) fell in the Good band (AQI 0–50), 16 (5%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 34, while the worst single-day peak hit 331 (Hazardous). Residents averaged about 28.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM10 (317 days), PM2.5 (32 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -2.4 points and the median AQI moved -2 points, placing the multi-year trajectory at stable. The annual record contains 2 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Apache (86.2% good, AQI 33); Cochise (69.9% good, AQI 45); Coconino (70.1% good, AQI 46); Gila (62.7% good, AQI 47); La Paz (76.6% good, AQI 44); Maricopa (8.8% good, AQI 73).
Air Quality Summary
Good Days
94.8%
331 of 349 monitored days
19.8pp vs 75% target
Max AQI Recorded
331
Hazardous
Health Grade
Excellent
90th-pct AQI 34
Mohave County, Good days share 94.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Mohave County, Unhealthy-or-worse share 5.7%
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 349 monitored days across EPA AQI categories.
Good
331
95%
Moderate
16
5%
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 · 317 days · 90.8%
- PM2.5 · 32 days · 9.2%
Health Impact Assessment
Excellent
Mohave County's air quality is rated Excellent based on 94.8% 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 317 of 349 monitored days.
5-Year Air Quality Trend
Air quality is stable in Mohave County. Highest Good-day share: 2021 (99.2%, 360 of 363 monitored 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 | 331 | 16 | 0 | 1 | 17 | 331 |
How does Mohave County compare?
How Mohave County compares
Good-day share better than typical
Mohave County 94.8%
Blaine County, Idaho 96.6%
Typical US county 76.0%
Median AQI better than typical
Mohave County 17
Blaine County, Idaho 17
Typical US county 39
Unhealthy days / yr worse than typical
Mohave County 2
Blaine County, Idaho 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Mohave County (17), not geographic neighbors.
Blaine County, Idaho
Median AQI 17 · 96.6% Good-day share
Luna County, New Mexico
Median AQI 17 · 84.7% Good-day share
Cook County, Minnesota
Median AQI 16 · 88.0% Good-day share
Dawson County, Montana
Median AQI 18 · 90.3% Good-day share
Hughes County, South Dakota
Median AQI 18 · 93.0% Good-day share
Pacific County, Washington
Median AQI 16 · 99.7% Good-day share
Same primary pollutant: PM10
PM10 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Putnam County, Florida
95.6% Good-day share · median AQI 21
Cass County, Nebraska
95.9% Good-day share · median AQI 19
Nye County, Nevada
92.6% Good-day share · median AQI 26
Lincoln County, Wyoming
98.9% Good-day share · median AQI 10
Platte County, Wyoming
90.6% Good-day share · median AQI 15
Navajo County, Arizona
99.5% Good-day share · median AQI 13
Arizona counties on the map
Geographic containment only, other monitored counties in Arizona, independent of AQI or pollutant match.
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 17 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 349 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Mohave County, Arizona? ▼
Mohave County has a median Air Quality Index (AQI) of 17, rated "Good." 94.8% of monitored days (331 out of 349) 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 317 days (91% 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 stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2021 at 99.2% (360 of 363 days). Lowest qualifying Good-day share: 2025 at 95.1% (331 of 349 days).
What does AQI 17 mean for health? ▼
Mohave County's median AQI of 17 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Mohave County compare to other counties in Arizona? ▼
Mohave County has 94.8% good air days. Nearby counties in Arizona: Apache (86.2% good), Cochise (69.9% good), Coconino (70.1% good), Gila (62.7% good), La Paz (76.6% good), Maricopa (8.8% good).
What is the 90th percentile AQI in Mohave County? ▼
The 90th percentile AQI for Mohave County is 34, 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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Mohave County, Arizona · 2020–2025
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Every figure on PlainAirData 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.