Seneca, Oregon Air Quality
Seneca has a median AQI of 34, earning an air quality grade of A — excellent air quality that ranks better than 84% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Seneca recorded 120 good air quality days (67% of monitored days).
Population: 109 • County: Grant
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Quick Facts
| Current AQI | 10 — Good |
| Air Quality Grade | A |
| Median AQI (2025) | 34 |
| vs. U.S. Cities | Better than 84% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↓ Worsening |
| Data Source | EPA AirNow |
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 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
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 Seneca Air Quality
What is the air quality in Seneca today?
The current AQI in Seneca is 10, which is rated "Good". Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Seneca getting better or worse?
Air quality in Seneca has been worsening in recent years. The median AQI rose from 29 in 2016 to 34 in 2025.
What is the most common air pollutant in Seneca?
PM2.5 is the primary air pollutant in Seneca, responsible for the most air quality-impacted days in 2025. Particulate matter can originate from vehicle exhaust, wildfires, and industrial emissions.
How many unhealthy air days does Seneca have per year?
In 2025, Seneca had 0 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 120 good days and 60 moderate days out of 180 days monitored.
What air quality grade does Seneca receive?
Seneca receives an air quality grade of A, placing it better than 84% of US cities. This grade is based on a median AQI of 34 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 84% of US cities
Nearby Cities
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National Rankings
See how Seneca compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Seneca
Based on your area's air quality (median AQI: 34), we recommend these air purifiers to help protect your health indoors.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
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Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
Dyson Pure Cool TP04
Premium all-in-one air purifier and fan with advanced features.
Not sure which air purifier is right for you?
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Read our complete buying guide →