Bryn Athyn, Pennsylvania Air Quality
Bryn Athyn has a median AQI of 41, earning an air quality grade of A- — excellent air quality that ranks better than 50% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Bryn Athyn recorded 152 good air quality days (72% of monitored days) and 1 unhealthy days.
Population: 1,143 • County: Montgomery
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Quick Facts
| Current AQI | 51 — Moderate |
| Air Quality Grade | A- |
| Median AQI (2025) | 41 |
| vs. U.S. Cities | Better than 50% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | ↓ Worsening |
| Data Source | EPA AirNow |
Health Recommendation
Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
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 Bryn Athyn Air Quality
What is the air quality in Bryn Athyn today?
The current AQI in Bryn Athyn is 51, which is rated "Moderate". Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Is air quality in Bryn Athyn getting better or worse?
Air quality in Bryn Athyn has been worsening in recent years. The median AQI rose from 34 in 2016 to 41 in 2025.
What is the most common air pollutant in Bryn Athyn?
Ozone is the primary air pollutant in Bryn Athyn, responsible for the most air quality-impacted days in 2025. Ground-level ozone forms when sunlight reacts with vehicle and industrial emissions on warm days.
How many unhealthy air days does Bryn Athyn have per year?
In 2025, Bryn Athyn had 1 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 152 good days and 59 moderate days out of 212 days monitored.
What air quality grade does Bryn Athyn receive?
Bryn Athyn receives an air quality grade of A-, placing it better than 50% of US cities. This grade is based on a median AQI of 41 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 50% of US cities
Nearby Cities
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National Rankings
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Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Bryn Athyn
Based on your area's air quality (median AQI: 41), we recommend these air purifiers to help protect your health indoors.
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