Metro area air quality · 2025

Claremont-Lebanon, NH-VT

Median AQI 36 (Good). 83.6% of monitored days rated Good across this metro's EPA monitoring network.

36
Median AQI
83.6%
Good-air days
0
Unhealthy days
75%
Cleaner than US metros

Claremont-Lebanon, NH-VT posted a 2025 median AQI of 36 (Good) with 83.6% Good days

According to the U.S. EPA Air Quality System, the Claremont-Lebanon, NH-VT CBSA recorded a median AQI of 36 across 365 monitored days in 2025, with 83.6% 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 Claremont-Lebanon, NH-VT CBSA's 83.6% Good-day share places it cleaner than 75% of US metros in 2025.
Closest median-AQI peer
Atlantic City-Hammonton, NJ (82.2% Good, median AQI 36) is the closest nationwide median-AQI peer to Claremont-Lebanon, NH-VT.
2020–2025 Good-day shift
Claremont-Lebanon, NH-VT's Good-day share moved -9.7 points from 2020 to 2025 (median AQI +1).
Median AQI
Median AQI: 36

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Claremont-Lebanon, NH-VT sits in the upper Good-day tercile among EPA CBSA metros on this site (83.6% of 365 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 36 and 83.6% of 365 monitored days in the Good band.

36
median AQI · Good
83.6%
days rated Good
75%
cleaner than US metros
113
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
  • Claremont-Lebanon, NH-VT metro's Good-day share fell from 91.3% to 84.3% between the 2024 and 2025 EPA annual releases, a change of -7.0 percentage points.
  • Claremont-Lebanon, NH-VT metro's peak single-day AQI rose from 80 to 113 between the 2024 and 2025 EPA annual releases, a change of +33 points.

Compared against 366 monitored days in 2024 and 362 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

Claremont-Lebanon, NH-VT sits in the upper Good-day tercile among EPA CBSA metros on this site (83.6% of 365 monitored days). Signature read: 83.6% 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 36 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 305 Good (84%), 57 Moderate (16%), and 3 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 54; the highest single-day reading hit 113 (USG).

Across 2020–2025, Good-day share shifted -9.7 points and median AQI moved +1 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Atlantic City-Hammonton, NJ (82.2% good, AQI 36); Barnstable Town, MA (93.7% good, AQI 36); Bemidji, MN (79.1% good, AQI 36).

Best and worst city air quality →

Air Quality Summary

Median AQI

36

Good

Good Days

83.6%

305 of 365 days

Max AQI

113

USG

Health Grade

Good

90th pct: 54

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

305

84%

Moderate

57

16%

USG

3

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Claremont-Lebanon, NH-VT metro area's air quality is rated Good based on 83.6% 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 Claremont-Lebanon, NH-VT metro compare?

How Claremont-Lebanon, NH-VT compares

Good-day share better than typical
Claremont-Lebanon, NH-VT 83.6%
Atlantic City-Hammonton, NJ 82.2%
Typical US metro 70.6%
Median AQI better than typical
Claremont-Lebanon, NH-VT 36
Atlantic City-Hammonton, NJ 36
Typical US metro 41
Unhealthy days / yr better than typical
Claremont-Lebanon, NH-VT 0
Atlantic City-Hammonton, NJ 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Claremont-Lebanon, NH-VT metro. Highest Good-day share: 2020 (94.0%, 344 of 366 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 344 22 0 35
2021 313 51 0 36
2022 330 35 0 36
2023 311 54 0 37
2024 334 32 0 35
2025 305 57 0 36

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Claremont-Lebanon, NH-VT (36).

Atlantic City-Hammonton, NJ

Median AQI 36 · 82.2% Good-day share

36

Barnstable Town, MA

Median AQI 36 · 93.7% Good-day share

36

Bemidji, MN

Median AQI 36 · 79.1% Good-day share

36

Crestview-Fort Walton Beach-Destin, FL

Median AQI 36 · 93.9% Good-day share

36

East Stroudsburg, PA

Median AQI 36 · 88.3% Good-day share

36

Jackson, TN

Median AQI 36 · 74.3% Good-day share

36

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Claremont-Lebanon, 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

Frequently Asked Questions

How many unhealthy air days does Claremont-Lebanon, NH-VT have? ▼
In 2025, the Claremont-Lebanon, NH-VT metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 113.
What is the air quality in the Claremont-Lebanon, NH-VT metro area? ▼
The Claremont-Lebanon, NH-VT metro area has a median Air Quality Index (AQI) of 36, rated "Good." 83.6% of monitored days (305 out of 365) had good air quality in 2025.
Is air quality in Claremont-Lebanon, NH-VT getting better or worse? ▼
Air quality in the Claremont-Lebanon, 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: 2020 at 94.0% (344 of 366 days). Lowest qualifying Good-day share: 2025 at 84.3% (305 of 362 days).
What does AQI 36 mean for health? ▼
An AQI of 36 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 Claremont-Lebanon, NH-VT compare to other metro areas? ▼
The Claremont-Lebanon, NH-VT metro has 83.6% good air days. Similar metros: Atlantic City-Hammonton, NJ (82.2% good), Barnstable Town, MA (93.7% good), Bemidji, MN (79.1% good).
What is the 90th percentile AQI for Claremont-Lebanon, NH-VT? ▼
The 90th percentile AQI for the Claremont-Lebanon, NH-VT metro area is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 113 (USG).

Data Sources

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