Metro area air quality · 2025

Moses Lake, WA

Median AQI 26 (Good). 89.7% of monitored days rated Good across this metro's EPA monitoring network.

26
Median AQI
89.7%
Good-air days
0
Unhealthy days
83%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 243 monitored days. EPA AQS →

The verdict

The Moses Lake, WA metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 26 with 89.7% of 243 monitored days in the Good band.

26
median AQI · Good
89.7%
days rated Good
83%
cleaner than US metros
76
worst single reading

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

Insights: Moses Lake, WA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 26 over 243 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 218 Good days (90%), 25 Moderate (10%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 51 while the highest single-day reading hit 76 (Moderate). Metro residents averaged roughly 26.9 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -107 and the median AQI moved +5 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 Branson, MO (100.0% good, AQI 26); Dodge City, KS (89.4% good, AQI 26); Olympia-Tumwater, WA (98.1% good, AQI 26).

Air Quality Summary

Median AQI

26

Good

Good Days

89.7%

218 of 243 days

Max AQI

76

Moderate

Health Grade

Good

90th pct: 51

AQI Day Breakdown (2025)

Distribution of 243 monitored days across EPA AQI categories.

Good

218

90%

Moderate

25

10%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Moses Lake, WA metro area's air quality is rated Good based on 89.7% 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 Moses Lake, WA metro compare?

How Moses Lake, WA compares

Good-day share better than US avg
Moses Lake, WA 89.7%
Branson, MO 100.0%
US average 71.3%
Median AQI better than US avg
Moses Lake, WA 26
Branson, MO 26
US average 41
Unhealthy days / yr better than US avg
Moses Lake, WA 0
Branson, MO 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Moses Lake, WA metro. Best year: 2020 (325 good days).

Year Good Moderate Unhealthy Median AQI
2020 325 31 4 21
2021 310 49 4 25
2022 279 83 3 30
2023 300 59 0 32
2024 318 48 0 26
2025 218 25 0 26

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Moses Lake, WA.

Branson, MO

AQI 26 · 100.0% good

26

Dodge City, KS

AQI 26 · 89.4% good

26

Olympia-Tumwater, WA

AQI 26 · 98.1% good

26

Port Angeles, WA

AQI 26 · 88.5% good

26

Aberdeen, SD

AQI 25 · 87.1% good

25

Anchorage, AK

AQI 25 · 78.6% good

25

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Moses Lake, WA metro area? ▼
The Moses Lake, WA metro area has a median Air Quality Index (AQI) of 26, rated "Good." 89.7% of monitored days (218 out of 243) had good air quality in 2025.
How many unhealthy air days does Moses Lake, WA have? ▼
In 2025, the Moses Lake, WA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 76.
Is air quality in Moses Lake, WA getting better or worse? ▼
Air quality in the Moses Lake, WA metro is stable based on 5-year trends (2020-2025). Best year: 2020 with 325 good days. Worst year: 2025 with 218 good days.
What does AQI 26 mean for health? ▼
An AQI of 26 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 Moses Lake, WA? ▼
The 90th percentile AQI for the Moses Lake, WA metro area is 51, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 76 (Moderate).
How does Moses Lake, WA compare to other metro areas? ▼
The Moses Lake, WA metro has 89.7% good air days. Similar metros: Branson, MO (100.0% good), Dodge City, KS (89.4% good), Olympia-Tumwater, WA (98.1% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025

Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.