Audubon, Pennsylvania Air Quality
Audubon 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, Audubon recorded 152 good air quality days (72% of monitored days) and 1 unhealthy days.
Population: 9,229 • County: Montgomery
Current AQI
Quick Facts
| Current AQI | 14 — Good |
| 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 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 Audubon is sourced from the Norristown monitoring area, located approximately 6 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Audubon has relatively consistent air quality throughout the year without a strong seasonal peak. Air quality is primarily influenced by local traffic, industrial activity, and regional weather patterns rather than a single seasonal driver.
AQI Trend (10 Years)
Air Quality Days by Year
Audubon Median AQI by Year
Annual EPA air quality data for Audubon — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 41 | 152 | 1 | 133 | Ozone |
| 2024 | 40 | 266 | 1 | 140 | Ozone |
| 2023 | 44 | 232 | 6 | 284 | PM2.5 |
| 2022 | 44 | 237 | 1 | 108 | PM2.5 |
| 2021 | 47 | 202 | 6 | 150 | PM2.5 |
| 2020 | 43 | 269 | — | 99 | PM2.5 |
| 2019 | 40 | 262 | 1 | 129 | PM2.5 |
| 2018 | 41 | 242 | 7 | 129 | PM2.5 |
| 2017 | 47 | 210 | 7 | 129 | PM2.5 |
| 2016 | 34 | 266 | 5 | 140 | Ozone |
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 Audubon Air Quality
What is the air quality in Audubon today?
The current AQI in Audubon is 14, 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 Audubon getting better or worse?
Air quality in Audubon has been worsening. The median AQI has risen 7 points (from 34 in 2016 to 41 in 2025), a concern for local health officials.
What is the most common air pollutant in Audubon?
Ozone is the primary air pollutant in Audubon, responsible for 109 days (51% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Audubon have per year?
In 2025, Audubon recorded 72% good air quality days (152 days) out of 212 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 133.
What air quality grade does Audubon receive?
Audubon receives an air quality grade of A-, placing it better than 50% of US cities. This is based on a median AQI of 41 in 2025, with 152 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 50% of US cities
Nearby Cities
Get AQI Alerts
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National Rankings
See how Audubon compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Audubon
Ozone is Audubon's primary pollutant. Standard HEPA filters don't capture ozone molecules — you need activated carbon or PECO technology to chemically break them down. We highlight those units here.
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