Median AQI
22
Good
Oregon · County air quality · 2025
Deschutes County, Oregon
Median AQI 22 (Good). 93.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 22
- Median AQI
- 93.4%
- Good-air days
- 0
- Unhealthy days
- 84%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Deschutes County's air is good on balance, cleaner than most US counties, a median AQI of 22 with 93.4% of 181 monitored days in the Good band, driven mainly by PM2.5.
- 22
- median AQI · Good
- 93.4%
- days rated Good
- PM2.5
- main pollutant
- 84%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 58.
Data updated July 2026
- Good · 169 d · 93.4%
- Moderate · 12 d · 6.6%
How did Deschutes County's air break down in 2025?
Across 181 monitored days, 169 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 58 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 181 days monitored. Median AQI: 22 (Good).
Insights: Deschutes County, Oregon. EPA monitors recorded a median Air Quality Index of 22 across 181 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 169 (93%) fell in the Good band (AQI 0–50), 12 (7%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 43, while the worst single-day peak hit 58 (Moderate). Residents averaged about 28.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (181 days). Across the 2020–2025 trend window, good days shifted by -129 and the median AQI moved -1 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 58, moderate but never Unhealthy. Nearby counties show comparable readings: Baker (89.0% good, AQI 25); Clackamas (93.9% good, AQI 27); Columbia (96.7% good, AQI 25); Crook (80.7% good, AQI 24); Grant (66.7% good, AQI 34); Harney (70.7% good, AQI 26).
Air Quality Summary
Good Days
93.4%
169 of 181 monitored days
18.4pp vs 75% target
Max AQI Recorded
58
Moderate
Health Grade
Excellent
90th-pct AQI 43
Deschutes County, Good days share 93.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Deschutes 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 181 monitored days across EPA AQI categories.
Good
169
93%
Moderate
12
7%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Deschutes County.
- PM2.5 · 181 days · 100.0%
Health Impact Assessment
Excellent
Deschutes County's air quality is rated Excellent based on 93.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 93.4% of monitored days in 2025, with a median AQI of 22. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 181 of 181 monitored days.
5-Year Air Quality Trend
Air quality is improving in Deschutes County. Best year: 2021 (298 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 298 | 54 | 4 | 2 | 23 | 1099 |
| 2021 | 298 | 47 | 10 | 7 | 25 | 403 |
| 2022 | 282 | 77 | 2 | 3 | 23 | 205 |
| 2023 | 273 | 66 | 10 | 9 | 28 | 413 |
| 2024 | 258 | 89 | 12 | 7 | 39 | 176 |
| 2025 | 169 | 12 | 0 | 0 | 22 | 58 |
How does Deschutes County compare?
How Deschutes County compares
Good-day share better than US avg
Deschutes County 93.4%
Baker County, Oregon 89.0%
US average 76.5%
Median AQI better than US avg
Deschutes County 22
Baker County, Oregon 25
US average 38
Unhealthy days / yr about average
Deschutes County 0
Baker County, Oregon 0
US average 0
Other Counties in Oregon
Air quality comparison for nearby counties in Oregon.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Deschutes County.
Blaine County, Idaho
AQI 22 · 99.4% good
Cass County, Minnesota
AQI 22 · 94.4% good
Chase County, Kansas
AQI 22 · 88.9% good
Douglas County, Nevada
AQI 22 · 90.9% good
Franklin County, Idaho
AQI 22 · 95.8% good
Franklin County, Washington
AQI 22 · 93.7% good
What Deschutes County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 22 means for exposure. Health guidance
- See how Deschutes County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Deschutes County with its Oregon neighbours before drawing a conclusion about the region. All of Oregon
Based on 181 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 Deschutes County, Oregon? ▼
Deschutes County has a median Air Quality Index (AQI) of 22, rated "Good." 93.4% of monitored days (169 out of 181) had good air quality in 2025.
What is the main pollutant in Deschutes County? ▼
The primary pollutant in Deschutes County is Fine Particles (PM2.5), which was the main AQI driver on 181 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Deschutes County have? ▼
In 2025, Deschutes County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 58.
Is the air quality in Deschutes County getting better or worse? ▼
Air quality in Deschutes County is improving based on 5-year trends (2020-2025). Best year: 2021 with 298 good days. Worst year: 2025 with 169 good days.
What does AQI 22 mean for health? ▼
Deschutes County's median AQI of 22 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 Deschutes County compare to other counties in Oregon? ▼
Deschutes County has 93.4% good air days. Nearby counties in Oregon: Baker (89.0% good), Clackamas (93.9% good), Columbia (96.7% good), Crook (80.7% good), Grant (66.7% good), Harney (70.7% good).
What is the 90th percentile AQI in Deschutes County? ▼
The 90th percentile AQI for Deschutes County is 43, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 58 (Moderate).
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.