Metro area air quality · 2025

Port Angeles, WA

Median AQI 26 (Good). 88.5% of monitored days rated Good across this metro's EPA monitoring network.

26
Median AQI
88.5%
Good-air days
0
Unhealthy days
80%
Cleaner than US metros

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

The verdict

The Port Angeles, WA metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 26 with 88.5% of 243 monitored days in the Good band.

26
median AQI · Good
88.5%
days rated Good
80%
cleaner than US metros
60
worst single reading

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

Insights: Port Angeles, 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 215 Good days (88%), 28 Moderate (12%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 52 while the highest single-day reading hit 60 (Moderate). Metro residents averaged roughly 26.5 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -89 and the median AQI moved -11 points, which classifies the multi-year trajectory as improving. 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); Moses Lake, WA (89.7% good, AQI 26).

Air Quality Summary

Median AQI

26

Good

Good Days

88.5%

215 of 243 days

Max AQI

60

Moderate

Health Grade

Good

90th pct: 52

AQI Day Breakdown (2025)

Distribution of 243 monitored days across EPA AQI categories.

Good

215

88%

Moderate

28

12%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Port Angeles, WA metro area's air quality is rated Good based on 88.5% 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 Port Angeles, WA metro compare?

How Port Angeles, WA compares

Good-day share better than US avg
Port Angeles, WA 88.5%
Branson, MO 100.0%
US average 71.3%
Median AQI better than US avg
Port Angeles, WA 26
Branson, MO 26
US average 41
Unhealthy days / yr better than US avg
Port Angeles, WA 0
Branson, MO 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Port Angeles, WA metro. Best year: 2024 (321 good days).

Year Good Moderate Unhealthy Median AQI
2020 304 55 1 37
2021 298 67 0 37
2022 272 91 0 38
2023 307 57 0 37
2024 321 45 0 36
2025 215 28 0 26

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Port Angeles, WA.

Branson, MO

AQI 26 · 100.0% good

26

Dodge City, KS

AQI 26 · 89.4% good

26

Moses Lake, WA

AQI 26 · 89.7% good

26

Olympia-Tumwater, WA

AQI 26 · 98.1% 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 Port Angeles, WA metro area? ▼
The Port Angeles, WA metro area has a median Air Quality Index (AQI) of 26, rated "Good." 88.5% of monitored days (215 out of 243) had good air quality in 2025.
How many unhealthy air days does Port Angeles, WA have? ▼
In 2025, the Port Angeles, WA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 60.
Is air quality in Port Angeles, WA getting better or worse? ▼
Air quality in the Port Angeles, WA metro is improving based on 5-year trends (2020-2025). Best year: 2024 with 321 good days. Worst year: 2025 with 215 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 Port Angeles, WA? ▼
The 90th percentile AQI for the Port Angeles, WA metro area is 52, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 60 (Moderate).
How does Port Angeles, WA compare to other metro areas? ▼
The Port Angeles, WA metro has 88.5% good air days. Similar metros: Branson, MO (100.0% good), Dodge City, KS (89.4% good), Moses Lake, WA (89.7% 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.