Metro area air quality · 2024

Los Alamos, NM

Median AQI 14 (Good). 100.0% of monitored days rated Good across this metro's EPA monitoring network.

14
Median AQI
100.0%
Good-air days
0
Unhealthy days
99%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 116 monitored days. EPA AQS → · NOAA →

Insights: Los Alamos, NM metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 14 over 116 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 116 Good days (100%), 0 Moderate (0%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 27 while the highest single-day reading hit 41 (Good). Metro residents averaged roughly 30.0 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +3 and the median AQI moved +1 points, which classifies the multi-year trajectory as stable. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Ca¤on City, CO (97.8% good, AQI 13); Guayama, PR (98.1% good, AQI 15); Havre, MT (92.6% good, AQI 15).

Air Quality Summary

Median AQI

14

Good

Good Days

100.0%

116 of 116 days

Max AQI

41

Good

Health Grade

Excellent

90th pct: 27

AQI Day Breakdown (2024)

Distribution of 116 monitored days across EPA AQI categories.

Good

116

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 2024.

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 US avg
Los Alamos, NM 100.0%
Ca¤on City, CO 97.8%
US average 70.2%
Median AQI better than US avg
Los Alamos, NM 14
Ca¤on City, CO 13
US average 41
Unhealthy days / yr better than US avg
Los Alamos, NM 0
Ca¤on City, CO 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Los Alamos, NM metro. Best year: 2023 (121 good 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

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Los Alamos, NM.

Ca¤on City, CO

AQI 13 · 97.8% good

13

Guayama, PR

AQI 15 · 98.1% good

15

Havre, MT

AQI 15 · 92.6% good

15

Show Low, AZ

AQI 13 · 99.5% good

13

Houghton, MI

AQI 12 · 98.3% good

12

Ruidoso, NM

AQI 16 · 97.4% good

16

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Frequently Asked Questions

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 14, rated "Good." 100.0% of monitored days (116 out of 116) had good air quality in 2024.
How many unhealthy air days does Los Alamos, NM have? ▼
In 2024, the Los Alamos, NM metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 41.
Is air quality in Los Alamos, NM getting better or worse? ▼
Air quality in the Los Alamos, NM metro is stable based on 5-year trends (2020-2024). Best year: 2023 with 121 good days. Worst year: 2022 with 112 good days.
What does AQI 14 mean for health? ▼
An AQI of 14 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 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 41 (Good).
How does Los Alamos, NM compare to other metro areas? ▼
The Los Alamos, NM metro has 100.0% good air days. Similar metros: Ca¤on City, CO (97.8% good), Guayama, PR (98.1% good), Havre, MT (92.6% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA, AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025