Metro area air quality · 2025

Laconia, NH

Median AQI 32 (Good). 88.8% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

32
Median AQI: 88.8%
Good-air days: 0
Unhealthy days: 84%
Cleaner than US metros

Laconia, NH posted a 2025 median AQI of 32 (Good) with 88.8% Good days

According to the U.S. EPA Air Quality System, the Laconia, NH CBSA recorded a median AQI of 32 across 365 monitored days in 2025, with 88.8% 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 Laconia, NH CBSA's 88.8% Good-day share places it cleaner than 84% of US metros in 2025.
Closest median-AQI peer: Crescent City, CA (81.8% Good, median AQI 32) is the closest nationwide median-AQI peer to Laconia, NH.
2020–2025 Good-day shift: Laconia, NH's Good-day share moved -6.5 points from 2020 to 2025 (median AQI +0).
Median AQI: Median AQI: 32

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

The verdict

Laconia, NH sits in the upper Good-day tercile among EPA CBSA metros on this site (88.8% of 365 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 32 and 88.8% of 365 monitored days in the Good band.

32
median AQI · Good: 88.8%
days rated Good: 84%
cleaner than US metros: 92
worst single reading

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

Laconia, NH metro's Good-day share rose from 85.2% to 88.8% between the 2024 and 2025 EPA annual releases, a change of +3.6 percentage points.
Laconia, NH metro's peak single-day AQI rose from 78 to 92 between the 2024 and 2025 EPA annual releases, a change of +14 points.
Laconia, NH metro's median AQI fell from 35 to 32 between the 2024 and 2025 EPA annual releases, a change of -3 points.

Laconia, NH sits in the upper Good-day tercile among EPA CBSA metros on this site (88.8% of 365 monitored days). Signature read: 88.8% 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 32 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 324 Good (89%), 41 Moderate (11%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 51; the highest single-day reading hit 92 (Moderate).

Across 2020–2025, Good-day share shifted -6.5 points and median AQI moved +0 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Crescent City, CA (81.8% good, AQI 32); Hilo, HI (86.0% good, AQI 32); Athens, OH (83.4% good, AQI 31).

Best and worst city air quality →

Air Quality Summary

Median AQI

Good

Good Days

88.8%

324 of 365 days

Max AQI

Moderate

Health Grade

Good

90th pct: 51

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

324

89%

Moderate

11%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Good

The Laconia, NH metro area's air quality is rated Good based on 88.8% 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 Laconia, NH metro compare?

How Laconia, NH compares

Compare against

Good-day share better than typical

Laconia, NH 88.8%

Crescent City, CA 81.8%

Typical US metro 70.6%

Median AQI better than typical

Laconia, NH 32

Crescent City, CA 32

Typical US metro 41

Unhealthy days / yr better than typical

Laconia, NH 0

Crescent City, CA 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Laconia, NH metro. Highest Good-day share: 2020 (95.3%, 342 of 359 monitored days).

Year	Good	Moderate	Median AQI	Max AQI
2020	342	17	32	65
2021	340	24	31	110
2022	339	19	32	68
2023	310	54	35	105
2024	311	54	35	78
2025	324	41	32	92

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Laconia, NH (32).

Crescent City, CA

Median AQI 32 · 81.8% Good-day share

Hilo, HI

Median AQI 32 · 86.0% Good-day share

Athens, OH

Median AQI 31 · 83.4% Good-day share

Bangor, ME

Median AQI 33 · 84.2% Good-day share

Bellingham, WA

Median AQI 31 · 94.0% Good-day share

Clarksburg, WV

Median AQI 33 · 72.4% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Laconia, NH'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 Laconia, NH have? ▼

In 2025, the Laconia, NH metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 92.

What is the air quality in the Laconia, NH metro area? ▼

The Laconia, NH metro area has a median Air Quality Index (AQI) of 32, rated "Good." 88.8% of monitored days (324 out of 365) had good air quality in 2025.

Is air quality in Laconia, NH getting better or worse? ▼

Air quality in the Laconia, NH 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 95.3% (342 of 359 days). Lowest qualifying Good-day share: 2023 at 85.2% (310 of 364 days).

What does AQI 32 mean for health? ▼

An AQI of 32 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 Laconia, NH compare to other metro areas? ▼

The Laconia, NH metro has 88.8% good air days. Similar metros: Crescent City, CA (81.8% good), Hilo, HI (86.0% good), Athens, OH (83.4% good).

What is the 90th percentile AQI for Laconia, NH? ▼

The 90th percentile AQI for the Laconia, NH metro area is 51, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 92 (Moderate).

Data Sources

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