Median AQI
48
Good
Arizona · County air quality · 2025
Coconino County, Arizona
Median AQI 48 (Good). 62.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 48
- Median AQI
- 62.5%
- Good-air days
- 0
- Unhealthy days
- 19%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Coconino County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 48 with 62.5% of 267 monitored days in the Good band, driven mainly by Ozone.
- 48
- median AQI · Good
- 62.5%
- days rated Good
- Ozone
- main pollutant
- 19%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 113.
Data updated July 2026
- Good · 167 d · 62.5%
- Moderate · 98 d · 36.7%
- USG · 2 d · 0.7%
How did Coconino County's air break down in 2025?
Across 267 monitored days, 167 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 113 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 267 days monitored. Median AQI: 48 (Good).
Insights: Coconino County, Arizona. EPA monitors recorded a median Air Quality Index of 48 across 267 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 167 (63%) fell in the Good band (AQI 0–50), 98 (37%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 74, while the worst single-day peak hit 113 (USG). Residents averaged about 18.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (265 days), PM2.5 (2 days). Across the 2020–2025 trend window, good days shifted by -135 and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 113, usg but never Unhealthy. Nearby counties show comparable readings: Apache (99.6% good, AQI 14); Cochise (65.6% good, AQI 46); Gila (52.0% good, AQI 50); La Paz (68.6% good, AQI 47); Maricopa (16.4% good, AQI 71); Mohave (93.4% good, AQI 19).
Air Quality Summary
Good Days
62.5%
167 of 267 monitored days
-12.5pp vs 75% target
Max AQI Recorded
113
USG
Health Grade
Moderate
90th-pct AQI 74
Coconino County, Good days share 62.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Coconino County, Unhealthy-or-worse share 0.0%
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 267 monitored days across EPA AQI categories.
Good
167
63%
Moderate
98
37%
USG
2
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Coconino County.
- Ozone · 265 days · 99.3%
- PM2.5 · 2 days · 0.7%
Health Impact Assessment
Moderate
Coconino County's air quality is rated Moderate based on 62.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 62.5% of monitored days in 2025, with a median AQI of 48. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 265 of 267 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Coconino County. Best year: 2020 (302 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 302 | 64 | 0 | 0 | 44 | 93 |
| 2021 | 265 | 100 | 0 | 0 | 46 | 93 |
| 2022 | 279 | 85 | 1 | 0 | 44 | 101 |
| 2023 | 243 | 118 | 1 | 2 | 46 | 203 |
| 2024 | 250 | 111 | 5 | 0 | 46 | 136 |
| 2025 | 167 | 98 | 2 | 0 | 48 | 113 |
How does Coconino County compare?
How Coconino County compares
Good-day share worse than US avg
Coconino County 62.5%
Apache County, Arizona 99.6%
US average 76.5%
Median AQI worse than US avg
Coconino County 48
Apache County, Arizona 14
US average 38
Unhealthy days / yr about average
Coconino County 0
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 Coconino County.
Black Hawk County, Iowa
AQI 48 · 56.6% good
Box Elder County, Utah
AQI 48 · 60.0% good
Brookings County, South Dakota
AQI 48 · 53.0% good
Clear Creek County, Colorado
AQI 48 · 64.4% good
Columbia County, Florida
AQI 48 · 56.4% good
Davis County, Utah
AQI 48 · 59.5% good
What Coconino County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 48 means for exposure. Health guidance
- See how Coconino County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Coconino County with its Arizona neighbours before drawing a conclusion about the region. All of Arizona
Based on 267 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 Coconino County, Arizona? ▼
Coconino County has a median Air Quality Index (AQI) of 48, rated "Good." 62.5% of monitored days (167 out of 267) had good air quality in 2025.
What is the main pollutant in Coconino County? ▼
The primary pollutant in Coconino County is Ozone (O3), which was the main AQI driver on 265 days (99% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Coconino County have? ▼
In 2025, Coconino County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 113.
Is the air quality in Coconino County getting better or worse? ▼
Air quality in Coconino County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 302 good days. Worst year: 2025 with 167 good days.
What does AQI 48 mean for health? ▼
Coconino County's median AQI of 48 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 Coconino County compare to other counties in Arizona? ▼
Coconino County has 62.5% good air days. Nearby counties in Arizona: Apache (99.6% good), Cochise (65.6% good), Gila (52.0% good), La Paz (68.6% good), Maricopa (16.4% good), Mohave (93.4% good).
What is the 90th percentile AQI in Coconino County? ▼
The 90th percentile AQI for Coconino County is 74, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 113 (USG).
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.