Metro area air quality · 2025

Aberdeen, WA

Median AQI 22 (Good). 97.3% of monitored days rated Good across this metro's EPA monitoring network.

22
Median AQI
97.3%
Good-air days
0
Unhealthy days
97%
Cleaner than US metros

Aberdeen, WA posted a 2025 median AQI of 22 (Good) with 97.3% Good days

According to the U.S. EPA Air Quality System, the Aberdeen, WA CBSA recorded a median AQI of 22 across 365 monitored days in 2025, with 97.3% 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 Aberdeen, WA CBSA's 97.3% Good-day share places it cleaner than 97% of US metros in 2025.
Closest median-AQI peer
Bremerton-Silverdale, WA (95.5% Good, median AQI 22) is the closest nationwide median-AQI peer to Aberdeen, WA.
2020–2025 Good-day shift
Aberdeen, WA's Good-day share moved +5.6 points from 2020 to 2025 (median AQI -5).
Median AQI
Median AQI: 22

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

The verdict

Aberdeen, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (97.3% of 365 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 22 and 97.3% of 365 monitored days in the Good band.

22
median AQI · Good
97.3%
days rated Good
97%
cleaner than US metros
76
worst single reading

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

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Aberdeen, WA metro's peak single-day AQI rose from 64 to 76 between the 2024 and 2025 EPA annual releases, a change of +12 points.

Compared against 366 monitored days in 2024 and 365 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Aberdeen, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (97.3% of 365 monitored days). Signature read: 97.3% 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 22 over 365 measured days in 2025 (Good / Excellent). The monitored-day split lands at 355 Good (97%), 10 Moderate (3%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 41; the highest single-day reading hit 76 (Moderate).

Across 2020–2025, Good-day share shifted +5.6 points and median AQI moved -5 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bremerton-Silverdale, WA (95.5% good, AQI 22); Gardnerville Ranchos, NV (91.1% good, AQI 22); Longview, WA (90.4% good, AQI 22).

Best and worst city air quality →

Air Quality Summary

Median AQI

22

Good

Good Days

97.3%

355 of 365 days

Max AQI

76

Moderate

Health Grade

Excellent

90th pct: 41

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

355

97%

Moderate

10

3%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Aberdeen, WA metro area's air quality is rated Excellent based on 97.3% 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 Aberdeen, WA metro compare?

How Aberdeen, WA compares

Good-day share better than typical
Aberdeen, WA 97.3%
Bremerton-Silverdale, WA 95.5%
Typical US metro 70.6%
Median AQI better than typical
Aberdeen, WA 22
Bremerton-Silverdale, WA 22
Typical US metro 41
Unhealthy days / yr better than typical
Aberdeen, WA 0
Bremerton-Silverdale, WA 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Aberdeen, WA metro. Highest Good-day share: 2025 (97.3%, 355 of 365 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 330 28 2 27
2021 347 18 0 26
2022 340 24 0 22
2023 339 26 0 23
2024 353 13 0 20
2025 355 10 0 22

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Aberdeen, WA (22).

Bremerton-Silverdale, WA

Median AQI 22 · 95.5% Good-day share

22

Gardnerville Ranchos, NV

Median AQI 22 · 91.1% Good-day share

22

Longview, WA

Median AQI 22 · 90.4% Good-day share

22

Steamboat Springs, CO

Median AQI 22 · 93.7% Good-day share

22

Bend-Redmond, OR

Median AQI 23 · 89.3% Good-day share

23

Cañon City, CO

Median AQI 23 · 93.4% Good-day share

23

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Aberdeen, WA's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

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

Albany-Schenectady-Troy, NY

0 unhealthy-or-worse days · median AQI 41

41

Frequently Asked Questions

How many unhealthy air days does Aberdeen, WA have? ▼
In 2025, the Aberdeen, WA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 76.
What is the air quality in the Aberdeen, WA metro area? ▼
The Aberdeen, WA metro area has a median Air Quality Index (AQI) of 22, rated "Good." 97.3% of monitored days (355 out of 365) had good air quality in 2025.
Is air quality in Aberdeen, WA getting better or worse? ▼
Air quality in the Aberdeen, WA metro is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2025 at 97.3% (355 of 365 days). Lowest qualifying Good-day share: 2020 at 91.7% (330 of 360 days).
What does AQI 22 mean for health? ▼
An AQI of 22 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 Aberdeen, WA compare to other metro areas? ▼
The Aberdeen, WA metro has 97.3% good air days. Similar metros: Bremerton-Silverdale, WA (95.5% good), Gardnerville Ranchos, NV (91.1% good), Longview, WA (90.4% good).
What is the 90th percentile AQI for Aberdeen, WA? ▼
The 90th percentile AQI for the Aberdeen, WA metro area is 41, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 76 (Moderate).

Data Sources

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