Old Town, Maine Air Quality
Old Town 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 improving steadily over the past decade, a positive sign for residents. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Old Town recorded 261 good air quality days (86% of monitored days) and 2 unhealthy days.
Population: 7,470 • County: Penobscot
Current AQI
Quick Facts
| Current AQI | 13 — Good |
| Air Quality Grade | A |
| Median AQI (2025) | 34 |
| vs. U.S. Cities | Better than 84% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 2 |
| 10-Year Trend | ↑ Improving |
| 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 Old Town is sourced from the Bangor MSS monitoring area, located approximately 9 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Old Town 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
Old Town Median AQI by Year
Annual EPA air quality data for Old Town — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 34 | 261 | 2 | 115 | Ozone |
| 2024 | 33 | 328 | — | 84 | Ozone |
| 2023 | 35 | 294 | — | 89 | PM2.5 |
| 2022 | 33 | 324 | — | 87 | PM2.5 |
| 2021 | 33 | 326 | — | 100 | Ozone |
| 2020 | 33 | 338 | — | 76 | Ozone |
| 2019 | 33 | 336 | — | 72 | PM2.5 |
| 2018 | 37 | 309 | — | 97 | PM2.5 |
| 2017 | 34 | 306 | — | 80 | PM2.5 |
| 2016 | 42 | 265 | — | 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 Old Town Air Quality
What is the air quality in Old Town today?
The current AQI in Old Town is 13, 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 Old Town getting better or worse?
Air quality in Old Town has been improving. The median AQI has dropped 8 points (from 42 in 2016 to 34 in 2025), a positive trend for residents.
What is the most common air pollutant in Old Town?
Ozone is the primary air pollutant in Old Town, responsible for 200 days (66% 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 Old Town have per year?
In 2025, Old Town recorded 86% good air quality days (261 days) out of 303 monitored days. There were 2 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 115.
What air quality grade does Old Town receive?
Old Town receives an air quality grade of A, placing it better than 84% of US cities. This is based on a median AQI of 34 in 2025, with 261 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 84% of US cities
Nearby Cities
Get AQI Alerts
Receive notifications when air quality changes in Old Town
National Rankings
See how Old Town compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Old Town
Ozone is Old Town'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.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
- ✓Good room size match
- ✓Recommended for your air quality
- ✓High performance
We may earn a commission from purchases
Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Honeywell HPA300
Powerful workhorse for large rooms. Built to last.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
Not sure which air purifier is right for you?
Learn more about different types of air purifiers and how to choose the best one for your needs.
Read our complete buying guide →