Metro area air quality · 2025

Berlin, NH-VT

Median AQI 44 (Good). 81.5% of monitored days rated Good across this metro's EPA monitoring network.

44
Median AQI
81.5%
Good-air days
0
Unhealthy days
71%
Cleaner than US metros

Berlin, NH-VT posted a 2025 median AQI of 44 (Good) with 81.5% Good days

According to the U.S. EPA Air Quality System, the Berlin, NH-VT CBSA recorded a median AQI of 44 across 345 monitored days in 2025, with 81.5% 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 Berlin, NH-VT CBSA's 81.5% Good-day share places it cleaner than 71% of US metros in 2025.
Closest median-AQI peer
Bartlesville, OK (68.0% Good, median AQI 44) is the closest nationwide median-AQI peer to Berlin, NH-VT.
2020–2025 Good-day shift
Berlin, NH-VT's Good-day share moved -10.2 points from 2020 to 2025 (median AQI +1).
Median AQI
Median AQI: 44

Aggregated from EPA Air Quality System (2025), 345 monitored days. EPA AQS →

The verdict

The Berlin, NH-VT metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 44 with 81.5% of 345 monitored days in the Good band.

44
median AQI · Good
81.5%
days rated Good
71%
cleaner than US metros
119
worst single reading

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

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Berlin, NH-VT metro's peak single-day AQI rose from 90 to 119 between the 2024 and 2025 EPA annual releases, a change of +29 points.
  • Berlin, NH-VT metro's Good-day share rose from 81.1% to 82.4% between the 2024 and 2025 EPA annual releases, a change of +1.3 percentage points.

Compared against 365 monitored days in 2024 and 341 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Insights: Berlin, NH-VT metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 44 over 345 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 281 Good days (81%), 60 Moderate (17%), and 4 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 61 while the highest single-day reading hit 119 (USG). Metro residents averaged roughly 24.4 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -10.2 points (measured against 366 monitored days in 2020 and 341 in 2025, so raw day counts are not comparable) and the median AQI moved +1 points, which classifies the multi-year trajectory as worsening. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Bartlesville, OK (68.0% good, AQI 44); Bloomington, IL (66.0% good, AQI 44); Boston-Cambridge-Newton, MA-NH (71.0% good, AQI 44).

Air Quality Summary

Median AQI

44

Good

Good Days

81.5%

281 of 345 days

Max AQI

119

USG

Health Grade

Good

90th pct: 61

AQI Day Breakdown (2025)

Distribution of 345 monitored days across EPA AQI categories.

Good

281

81%

Moderate

60

17%

USG

4

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Berlin, NH-VT metro area's air quality is rated Good based on 81.5% 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 Berlin, NH-VT metro compare?

How Berlin, NH-VT compares

Good-day share better than typical
Berlin, NH-VT 81.5%
Bartlesville, OK 68.0%
Typical US metro 70.6%
Median AQI worse than typical
Berlin, NH-VT 44
Bartlesville, OK 44
Typical US metro 41
Unhealthy days / yr better than typical
Berlin, NH-VT 0
Bartlesville, OK 1
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Berlin, NH-VT metro. Highest Good-day share: 2022 (97.5%, 350 of 359 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 339 27 0 43
2021 325 33 0 42
2022 350 9 0 40
2023 318 42 0 43
2024 296 69 0 44
2025 281 60 0 44

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Berlin, NH-VT (44).

Bartlesville, OK

Median AQI 44 · 68.0% Good-day share

44

Bloomington, IL

Median AQI 44 · 66.0% Good-day share

44

Boston-Cambridge-Newton, MA-NH

Median AQI 44 · 71.0% Good-day share

44

Bridgeport-Stamford-Norwalk, CT

Median AQI 44 · 64.7% Good-day share

44

Buffalo-Cheektowaga-Niagara Falls, NY

Median AQI 44 · 63.8% Good-day share

44

Cedar City, UT

Median AQI 44 · 74.7% Good-day share

44

Metros with similar unhealthy-day exposure

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

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Berlin, NH-VT metro area? ▼
The Berlin, NH-VT metro area has a median Air Quality Index (AQI) of 44, rated "Good." 81.5% of monitored days (281 out of 345) had good air quality in 2025.
How many unhealthy air days does Berlin, NH-VT have? ▼
In 2025, the Berlin, NH-VT metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 119.
Is air quality in Berlin, NH-VT getting better or worse? ▼
Air quality in the Berlin, NH-VT metro is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2022 at 97.5% (350 of 359 days). Lowest qualifying Good-day share: 2024 at 81.1% (296 of 365 days).
What does AQI 44 mean for health? ▼
An AQI of 44 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 Berlin, NH-VT? ▼
The 90th percentile AQI for the Berlin, NH-VT metro area is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 119 (USG).
How does Berlin, NH-VT compare to other metro areas? ▼
The Berlin, NH-VT metro has 81.5% good air days. Similar metros: Bartlesville, OK (68.0% good), Bloomington, IL (66.0% good), Boston-Cambridge-Newton, MA-NH (71.0% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025

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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.