Metro area air quality · 2025

Los Alamos, NM

Median AQI 13 (Good). 100.0% of monitored days rated Good across this metro's EPA monitoring network.

13
Median AQI
100.0%
Good-air days
0
Unhealthy days

Los Alamos, NM posted a 2025 median AQI of 13 (Good) with 100.0% Good days

According to the U.S. EPA Air Quality System, the Los Alamos, NM CBSA recorded a median AQI of 13 across 82 monitored days in 2025, with 100.0% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Closest median-AQI peer
Show Low, AZ (99.5% Good, median AQI 13) is the closest nationwide median-AQI peer to Los Alamos, NM.
2020–2025 Good-day shift
Los Alamos, NM's Good-day share moved +3.4 points from 2020 to 2025 (median AQI +0).
Median AQI
Median AQI: 13
Good days
Good days: 100.0%

Aggregated from EPA Air Quality System (2025), 82 monitored days. EPA AQS →

The verdict

Los Alamos, NM sits in the upper Good-day tercile among EPA CBSA metros on this site (100.0% of 82 monitored days). On the EPA scale the metro runs good, with a median AQI of 13 and 100.0% of 82 monitored days in the Good band.

13
median AQI · Good
100.0%
days rated Good
42
worst single reading

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

Los Alamos, NM sits in the upper Good-day tercile among EPA CBSA metros on this site (100.0% of 82 monitored days). Signature read: 100.0% 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 13 over 82 measured days in 2025 (Good / Excellent). The monitored-day split lands at 82 Good (100%), 0 Moderate (0%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 27; the highest single-day reading hit 42 (Good).

Across 2020–2025, Good-day share shifted +3.4 points and median AQI moved +0 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Show Low, AZ (99.5% good, AQI 13); Havre, MT (92.1% good, AQI 14); Bozeman, MT (98.1% good, AQI 11).

Best and worst city air quality →

Air Quality Summary

Median AQI

13

Good

Good Days

100.0%

82 of 82 days

Max AQI

42

Good

Health Grade

Excellent

90th pct: 27

AQI Day Breakdown (2025)

Distribution of 82 monitored days across EPA AQI categories.

Good

82

100%

Moderate

0

0%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Los Alamos, NM metro area's air quality is rated Excellent based on 100.0% 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 Los Alamos, NM metro compare?

How Los Alamos, NM compares

Good-day share better than typical
Los Alamos, NM 100.0%
Show Low, AZ 99.5%
Typical US metro 70.6%
Median AQI better than typical
Los Alamos, NM 13
Show Low, AZ 13
Typical US metro 41
Unhealthy days / yr better than typical
Los Alamos, NM 0
Show Low, AZ 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Los Alamos, NM metro. Highest Good-day share: 2024 (100.0%, 116 of 116 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 113 4 0 13
2021 115 3 0 14
2022 112 5 0 14
2023 121 0 0 14
2024 116 0 0 14
2025 82 0 0 13

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Los Alamos, NM (13).

Show Low, AZ

Median AQI 13 · 99.5% Good-day share

13

Havre, MT

Median AQI 14 · 92.1% Good-day share

14

Bozeman, MT

Median AQI 11 · 98.1% Good-day share

11

Taos, NM

Median AQI 16 · 98.9% Good-day share

16

Deming, NM

Median AQI 17 · 84.7% Good-day share

17

Evanston, WY

Median AQI 9 · 100.0% Good-day share

9

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Los Alamos, NM'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 Los Alamos, NM have? ▼
In 2025, the Los Alamos, NM metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 42.
What is the air quality in the Los Alamos, NM metro area? ▼
The Los Alamos, NM metro area has a median Air Quality Index (AQI) of 13, rated "Good." 100.0% of monitored days (82 out of 82) had good air quality in 2025.
Is air quality in Los Alamos, NM getting better or worse? ▼
Air quality in the Los Alamos, NM metro is improving across floor-qualifying years (2020-2024); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 100.0% (116 of 116 days). Lowest qualifying Good-day share: 2022 at 95.7% (112 of 117 days).
What does AQI 13 mean for health? ▼
An AQI of 13 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 Los Alamos, NM compare to other metro areas? ▼
The Los Alamos, NM metro has 100.0% good air days. Similar metros: Show Low, AZ (99.5% good), Havre, MT (92.1% good), Bozeman, MT (98.1% good).
What is the 90th percentile AQI for Los Alamos, NM? ▼
The 90th percentile AQI for the Los Alamos, NM metro area is 27, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 42 (Good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Los Alamos, NM, 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, Los Alamos, NM · 2020–2025