Median AQI
46
Good
Arizona · County air quality · 2025
Coconino County, Arizona
Median AQI 46 (Good). 70.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 46
- Median AQI
- 70.1%
- Good-air days
- 0
- Unhealthy days
- 33%
- Cleaner than US counties
Coconino County's 2025 annual median AQI is 46 (Good), with 70.1% Good days
According to the U.S. EPA Air Quality System, Coconino County, Arizona posted a 2025 median AQI of 46 (Good) across 365 monitored days, with 70.1% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Coconino County's 70.1% Good-day share places it cleaner than 33% of US counties in 2025.
- Closest median-AQI peer
- Beaver County (55.6% Good, median AQI 46) is the closest nationwide median-AQI peer to Coconino County.
- 2020–2025 trend
- Coconino County's floor-qualifying Good-day share is worsening from 2020 to 2025 (82.5% → 70.1%).
- Median AQI
- Median AQI: 46
The verdict
According to EPA Air Quality System monitoring data, Coconino County's air is good on balance, more polluted than the median US county, a median AQI of 46 with 70.1% of 365 monitored days in the Good band, driven mainly by Ozone.
- 46
- median AQI · Good
- 70.1%
- days rated Good
- Ozone
- main pollutant
- 33%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 113.
Annual release change
What changed in the 2025 EPA annual release
- Coconino County's peak single-day AQI fell from 136 to 113 between the 2024 and 2025 EPA annual releases, a change of -23 points.
- Coconino County's Good-day share rose from 68.3% to 70.1% between the 2024 and 2025 EPA annual releases, a change of +1.8 percentage points.
Data updated August 2026
- Good · 256 d · 70.1%
- Moderate · 107 d · 29.3%
- USG · 2 d · 0.5%
How did Coconino County's air break down in 2025?
Across 365 monitored days, 256 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). 365 days monitored. Median AQI: 46 (Good).
Insights: Coconino County, Arizona. EPA monitors recorded a median Air Quality Index of 46 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 256 (70%) fell in the Good band (AQI 0–50), 107 (29%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 71, while the worst single-day peak hit 113 (USG). Residents averaged about 21.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (355 days), PM2.5 (10 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -12.4 points and the median AQI moved +2 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 (86.2% good, AQI 33); Cochise (69.9% good, AQI 45); Gila (62.7% good, AQI 47); La Paz (76.6% good, AQI 44); Maricopa (8.8% good, AQI 73); Mohave (94.8% good, AQI 17).
Air Quality Summary
Good Days
70.1%
256 of 365 monitored days
-4.9pp vs 75% target
Max AQI Recorded
113
USG
Health Grade
Moderate
90th-pct AQI 71
Coconino County, Good days share 70.1%
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 365 monitored days across EPA AQI categories.
Good
256
70%
Moderate
107
29%
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 · 355 days · 97.3%
- PM2.5 · 10 days · 2.7%
Health Impact Assessment
Moderate
Coconino County's air quality is rated Moderate based on 70.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 70.1% of monitored days in 2025, with a median AQI of 46. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 355 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Coconino County. Highest Good-day share: 2020 (82.5%, 302 of 366 monitored 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 | 256 | 107 | 2 | 0 | 46 | 113 |
How does Coconino County compare?
How Coconino County compares
Good-day share worse than US avg
Coconino County 70.1%
Beaver County, Pennsylvania 55.6%
US average 76.0%
Median AQI worse than US avg
Coconino County 46
Beaver County, Pennsylvania 46
US average 39
Unhealthy days / yr better than US avg
Coconino County 0
Beaver County, Pennsylvania 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Coconino County (46), not geographic neighbors.
Beaver County, Pennsylvania
Median AQI 46 · 55.6% Good-day share
Brookings County, South Dakota
Median AQI 46 · 58.6% Good-day share
Buchanan County, Missouri
Median AQI 46 · 56.4% Good-day share
Butte County, California
Median AQI 46 · 65.2% Good-day share
Clark County, Indiana
Median AQI 46 · 58.1% Good-day share
Clarke County, Georgia
Median AQI 46 · 57.8% Good-day share
Same primary pollutant: Ozone
Ozone 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).
Sublette County, Wyoming
70.1% Good-day share · median AQI 47
Cochise County, Arizona
69.9% Good-day share · median AQI 45
Mercer County, New Jersey
69.9% Good-day share · median AQI 43
Armstrong County, Pennsylvania
70.5% Good-day share · median AQI 41
Fremont County, Wyoming
69.6% Good-day share · median AQI 47
Douglas County, Nebraska
71.0% Good-day share · median AQI 42
Arizona counties on the map
Geographic containment only, other monitored counties in Arizona, independent of AQI or pollutant match.
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 46 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 365 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 Coconino County, Arizona? ▼
Coconino County has a median Air Quality Index (AQI) of 46, rated "Good." 70.1% of monitored days (256 out of 365) 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 355 days (97% 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 across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 82.5% (302 of 366 days). Lowest qualifying Good-day share: 2023 at 66.8% (243 of 365 days).
What does AQI 46 mean for health? ▼
Coconino County's median AQI of 46 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Coconino County compare to other counties in Arizona? ▼
Coconino County has 70.1% good air days. Nearby counties in Arizona: Apache (86.2% good), Cochise (69.9% good), Gila (62.7% good), La Paz (76.6% good), Maricopa (8.8% good), Mohave (94.8% good).
What is the 90th percentile AQI in Coconino County? ▼
The 90th percentile AQI for Coconino County is 71, 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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Coconino 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.