Lostine, Oregon Air Quality
Lostine has a median AQI of 23, earning an air quality grade of A+ — excellent air quality that ranks better than 92% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Lostine recorded 165 good air quality days (91% of monitored days).
Population: 255 • County: Wallowa
Current AQI
Quick Facts
| Current AQI | 11 — Good |
| Air Quality Grade | A+ |
| Median AQI (2025) | 23 |
| vs. U.S. Cities | Better than 92% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Lostine is sourced from the Enterprise - US Forest Service monitoring area, located approximately 8 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Wildfire smoke is a significant factor in Lostine's air quality, with regional fires capable of pushing AQI from Good to Unhealthy within hours during fire season (typically July through October). On smoke-impacted days, staying indoors with windows closed and running an air purifier with a HEPA filter is the most effective protection.
AQI Trend (10 Years)
Air Quality Days by Year
Lostine Median AQI by Year
Annual EPA air quality data for Lostine — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 23 | 165 | — | 62 | PM2.5 |
| 2024 | 23 | 283 | 1 | 125 | PM2.5 |
| 2023 | 25 | 315 | — | 82 | PM2.5 |
| 2022 | 27 | 270 | 8 | 195 | PM2.5 |
| 2021 | 26 | 280 | 10 | 162 | PM2.5 |
| 2020 | 27 | 288 | 7 | 222 | PM2.5 |
| 2019 | 29 | 289 | 1 | 103 | PM2.5 |
| 2018 | 28 | 251 | 2 | 118 | PM2.5 |
| 2017 | 27 | 271 | 9 | 177 | PM2.5 |
| 2016 | 23 | 308 | — | 78 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Lostine Air Quality
What is the air quality in Lostine today?
The current AQI in Lostine is 11, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Lostine getting better or worse?
Air quality in Lostine has been stable. The median AQI has remained stable at around 23 over the past decade.
What is the most common air pollutant in Lostine?
PM2.5 is the primary air pollutant in Lostine, responsible for 181 days (100% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Lostine have per year?
In 2025, Lostine recorded 91% good air quality days (165 days) out of 181 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 62.
What air quality grade does Lostine receive?
Lostine receives an air quality grade of A+, placing it better than 92% of US cities. This is based on a median AQI of 23 in 2025, with 165 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 92% of US cities
Nearby Cities
Get AQI Alerts
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National Rankings
See how Lostine compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Lostine
Lostine faces elevated PM2.5 from wildfire smoke in addition to year-round traffic and industrial sources. We prioritize True HEPA units with high smoke CADR — essential for rapid air cleaning during smoke events.
Blueair Blue Pure 211+
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Other Great Options
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