Metro area air quality · 2024

Bangor, ME

Median AQI 33 (Good). 90.6% of monitored days rated Good across this metro's EPA monitoring network.

33
Median AQI
90.6%
Good-air days
0
Unhealthy days
86%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 362 monitored days. EPA AQS → · NOAA →

Insights: Bangor, ME metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 33 over 362 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 328 Good days (91%), 34 Moderate (9%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 49 while the highest single-day reading hit 84 (Moderate). Metro residents averaged roughly 27.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by -10 and the median AQI moved +0 points, which classifies the multi-year trajectory as stable. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Bellingham, WA (92.8% good, AQI 33); Fairmont, WV (76.6% good, AQI 33); Jackson, TN (81.0% good, AQI 33).

Air Quality Summary

Median AQI

33

Good

Good Days

90.6%

328 of 362 days

Max AQI

84

Moderate

Health Grade

Excellent

90th pct: 49

AQI Day Breakdown (2024)

Distribution of 362 monitored days across EPA AQI categories.

Good

328

91%

Moderate

34

9%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Bangor, ME metro area's air quality is rated Excellent based on 90.6% good air days. No unhealthy air days were recorded in 2024.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Bangor, ME metro compare?

How Bangor, ME compares

Good-day share better than US avg
Bangor, ME 90.6%
Bellingham, WA 92.8%
US average 70.2%
Median AQI better than US avg
Bangor, ME 33
Bellingham, WA 33
US average 41
Unhealthy days / yr better than US avg
Bangor, ME 0
Bellingham, WA 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Bangor, ME metro. Best year: 2020 (338 good days).

Year Good Moderate Unhealthy Median AQI
2020 338 25 0 33
2021 326 36 0 33
2022 324 37 0 33
2023 294 64 0 35
2024 328 34 0 33

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Bangor, ME.

Bellingham, WA

AQI 33 · 92.8% good

33

Fairmont, WV

AQI 33 · 76.6% good

33

Jackson, TN

AQI 33 · 81.0% good

33

Klamath Falls, OR

AQI 33 · 70.8% good

33

Rockland, ME

AQI 33 · 96.6% good

33

Athens, TN

AQI 32 · 78.9% good

32

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Air Quality Guides

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Health Effects of Air Pollution

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Frequently Asked Questions

What is the air quality in the Bangor, ME metro area? ▼
The Bangor, ME metro area has a median Air Quality Index (AQI) of 33, rated "Good." 90.6% of monitored days (328 out of 362) had good air quality in 2024.
How many unhealthy air days does Bangor, ME have? ▼
In 2024, the Bangor, ME metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is air quality in Bangor, ME getting better or worse? ▼
Air quality in the Bangor, ME metro is stable based on 5-year trends (2020-2024). Best year: 2020 with 338 good days. Worst year: 2023 with 294 good days.
What does AQI 33 mean for health? ▼
An AQI of 33 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Bangor, ME? ▼
The 90th percentile AQI for the Bangor, ME metro area is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (Moderate).
How does Bangor, ME compare to other metro areas? ▼
The Bangor, ME metro has 90.6% good air days. Similar metros: Bellingham, WA (92.8% good), Fairmont, WV (76.6% good), Jackson, TN (81.0% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA, AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025