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.

Compiled by PlainAirData · August 23, 2026

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

Berlin, NH-VT sits in the upper Good-day tercile among EPA CBSA metros on this site (81.5% of 345 monitored days). On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 44 and 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.

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.

Berlin, NH-VT sits in the upper Good-day tercile among EPA CBSA metros on this site (81.5% of 345 monitored days). Signature read: 81.5% 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 44 over 345 measured days in 2025 (Good / Good). The monitored-day split lands at 281 Good (81%), 60 Moderate (17%), and 4 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 61; the highest single-day reading hit 119 (USG).

Across 2020–2025, Good-day share shifted -10.2 points and median AQI moved +1 (worsening). No Unhealthy-tier days appear 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).

Best and worst city air quality →

Air Quality Summary

Median AQI

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

17%

USG

Unhealthy

Very Unhealthy

Hazardous

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

Compare against

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	Median AQI	Max AQI
2020	339	27	43	74
2021	325	33	42	133
2022	350	9	40	64
2023	318	42	43	136
2024	296	69	44	90
2025	281	60	44	119

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

Bloomington, IL

Median AQI 44 · 66.0% Good-day share

Boston-Cambridge-Newton, MA-NH

Median AQI 44 · 71.0% Good-day share

Bridgeport-Stamford-Norwalk, CT

Median AQI 44 · 64.7% Good-day share

Buffalo-Cheektowaga-Niagara Falls, NY

Median AQI 44 · 63.8% Good-day share

Cedar City, UT

Median AQI 44 · 74.7% Good-day share

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

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 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.

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.

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.

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).

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).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Berlin, NH-VT, 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, Berlin, NH-VT · 2020–2025 Accessed 2026-07-06