Metro area air quality · 2025

Rockland, ME

Median AQI 33 (Good). 97.8% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

33
Median AQI: 97.8%
Good-air days: 0
Unhealthy days: 98%
Cleaner than US metros

Rockland, ME posted a 2025 median AQI of 33 (Good) with 97.8% Good days

According to the U.S. EPA Air Quality System, the Rockland, ME CBSA recorded a median AQI of 33 across 359 monitored days in 2025, with 97.8% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US metros: The Rockland, ME CBSA's 97.8% Good-day share places it cleaner than 98% of US metros in 2025.
Closest median-AQI peer: Bangor, ME (84.2% Good, median AQI 33) is the closest nationwide median-AQI peer to Rockland, ME.
2020–2025 Good-day shift: Rockland, ME's Good-day share moved +1.8 points from 2020 to 2025 (median AQI +2).
Median AQI: Median AQI: 33

Aggregated from EPA Air Quality System (2025), 359 monitored days. EPA AQS →

The verdict

Rockland, ME sits in the upper Good-day tercile among EPA CBSA metros on this site (97.8% of 359 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 33 and 97.8% of 359 monitored days in the Good band.

33
median AQI · Good: 97.8%
days rated Good: 98%
cleaner than US metros: 77
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Rockland, ME metro's Good-day share rose from 96.6% to 97.8% between the 2024 and 2025 EPA annual releases, a change of +1.2 percentage points.

Rockland, ME sits in the upper Good-day tercile among EPA CBSA metros on this site (97.8% of 359 monitored days). Signature read: 97.8% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 33 over 359 measured days in 2025 (Good / Excellent). The monitored-day split lands at 351 Good (98%), 8 Moderate (2%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 44; the highest single-day reading hit 77 (Moderate).

Across 2020–2025, Good-day share shifted +1.8 points and median AQI moved +2 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bangor, ME (84.2% good, AQI 33); Clarksburg, WV (72.4% good, AQI 33); Grants Pass, OR (68.2% good, AQI 33).

Best and worst city air quality →

Air Quality Summary

Median AQI

Good

Good Days

97.8%

351 of 359 days

Max AQI

Moderate

Health Grade

Excellent

90th pct: 44

AQI Day Breakdown (2025)

Distribution of 359 monitored days across EPA AQI categories.

Good

351

98%

Moderate

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Excellent

The Rockland, ME metro area's air quality is rated Excellent based on 97.8% good air days. No unhealthy air days were recorded in 2025.

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

How does the Rockland, ME metro compare?

How Rockland, ME compares

Compare against

Good-day share better than typical

Rockland, ME 97.8%

Bangor, ME 84.2%

Typical US metro 70.6%

Median AQI better than typical

Rockland, ME 33

Bangor, ME 33

Typical US metro 41

Unhealthy days / yr better than typical

Rockland, ME 0

Bangor, ME 1

Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Rockland, ME metro. Highest Good-day share: 2023 (98.3%, 296 of 301 monitored days).

Year	Good	Moderate	Median AQI	Max AQI
2020	142	6	31	71
2021	192	17	35	119
2022	206	6	35	80
2023	296	5	33	87
2024	343	12	33	84
2025	351	8	33	77

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Rockland, ME (33).

Bangor, ME

Median AQI 33 · 84.2% Good-day share

Clarksburg, WV

Median AQI 33 · 72.4% Good-day share

Grants Pass, OR

Median AQI 33 · 68.2% Good-day share

Lawrenceburg, TN

Median AQI 33 · 81.5% Good-day share

Roanoke Rapids, NC

Median AQI 33 · 78.1% Good-day share

Vallejo-Fairfield, CA

Median AQI 33 · 99.2% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Rockland, ME's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

Akron, OH

0 unhealthy-or-worse days · median AQI 45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

Frequently Asked Questions

How many unhealthy air days does Rockland, ME have? ▼

In 2025, the Rockland, ME metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 77.

What is the air quality in the Rockland, ME metro area? ▼

The Rockland, ME metro area has a median Air Quality Index (AQI) of 33, rated "Good." 97.8% of monitored days (351 out of 359) had good air quality in 2025.

Is air quality in Rockland, ME getting better or worse? ▼

Air quality in the Rockland, ME metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2023 at 98.3% (296 of 301 days). Lowest qualifying Good-day share: 2021 at 91.9% (192 of 209 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.

How does Rockland, ME compare to other metro areas? ▼

The Rockland, ME metro has 97.8% good air days. Similar metros: Bangor, ME (84.2% good), Clarksburg, WV (72.4% good), Grants Pass, OR (68.2% good).

What is the 90th percentile AQI for Rockland, ME? ▼

The 90th percentile AQI for the Rockland, ME metro area is 44, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (Moderate).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Rockland, ME, 2025. See our methodology for how AQI, median, and coverage figures are computed.

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

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Rockland, ME · 2020–2025 Accessed 2026-07-06