Metro area air quality · 2025

Spokane-Spokane Valley, WA

Median AQI 47 (Good). 56.4% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

47
Median AQI: 56.4%
Good-air days: 6
Unhealthy days: 19%
Cleaner than US metros

Spokane-Spokane Valley, WA posted a 2025 median AQI of 47 (Good) with 56.4% Good days

According to the U.S. EPA Air Quality System, the Spokane-Spokane Valley, WA CBSA recorded a median AQI of 47 across 365 monitored days in 2025, with 56.4% rated Good and 6 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 Spokane-Spokane Valley, WA CBSA's 56.4% Good-day share places it cleaner than 19% of US metros in 2025.
Closest median-AQI peer: Charleston-North Charleston, SC (60.3% Good, median AQI 47) is the closest nationwide median-AQI peer to Spokane-Spokane Valley, WA.
2020–2025 Good-day shift: Spokane-Spokane Valley, WA's Good-day share moved +0.0 points from 2020 to 2025 (median AQI +0).
Median AQI: Median AQI: 47

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

The verdict

Spokane-Spokane Valley, WA lands in the lower Good-day tercile (56.4% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, among the more polluted US metros, with a median AQI of 47 and 56.4% of 365 monitored days in the Good band.

47
median AQI · Good: 56.4%
days rated Good: 19%
cleaner than US metros: 243
worst single reading

6 days reached Unhealthy or worse across the metro's monitors in 2025.

Spokane-Spokane Valley, WA metro's peak single-day AQI rose from 106 to 243 between the 2024 and 2025 EPA annual releases, a change of +137 points.
Spokane-Spokane Valley, WA metro's Good-day share fell from 63.6% to 57.4% between the 2024 and 2025 EPA annual releases, a change of -6.2 percentage points.
Spokane-Spokane Valley, WA metro's Unhealthy-category days rose from 0 to 4 between the 2024 and 2025 EPA annual releases, a change of +4 days.
Spokane-Spokane Valley, WA metro's median AQI rose from 44 to 47 between the 2024 and 2025 EPA annual releases, a change of +3 points.

Spokane-Spokane Valley, WA lands in the lower Good-day tercile (56.4% Good), a thinner clean-air share than most CBSA peers here. Signature read: 56.4% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 47 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 206 Good (56%), 149 Moderate (41%), and 4 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 68; the highest single-day reading hit 243 (Very Unhealthy).

Across 2020–2025, Good-day share shifted +0.0 points and median AQI moved +0 (stable). The annual record contains 6 days at Unhealthy or worse. Metros with comparable AQI profiles include Charleston-North Charleston, SC (60.3% good, AQI 47); Columbia, SC (58.1% good, AQI 47); Corsicana, TX (59.2% good, AQI 47).

Health effects of air pollution →

Air Quality Summary

Median AQI

Good

Good Days

56.4%

206 of 365 days

Max AQI

243

Very Unhealthy

Health Grade

Moderate

90th pct: 68

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

206

56%

Moderate

149

41%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Moderate

The Spokane-Spokane Valley, WA metro area's air quality is rated Moderate based on 56.4% good air days. There were 6 unhealthy days in 2025 when outdoor activity should be limited.

Air quality reached unhealthy levels on 6 days in 2025 (4 Unhealthy, 2 Very Unhealthy). Sensitive groups, including people with asthma, COPD, cardiovascular conditions, children, and adults over 65, should review the daily breakdown and follow local advisories.

Sensitive group advisory

People with asthma, COPD, heart disease, children, pregnant women, and adults 65+ should follow EPA AQI alerts daily and limit outdoor exertion when AQI exceeds 100. Real-time conditions: airnow.gov.

How does the Spokane-Spokane Valley, WA metro compare?

How Spokane-Spokane Valley, WA compares

Compare against

Good-day share worse than typical

Spokane-Spokane Valley, WA 56.4%

Charleston-North Charleston, SC 60.3%

Typical US metro 70.6%

Median AQI worse than typical

Spokane-Spokane Valley, WA 47

Charleston-North Charleston, SC 47

Typical US metro 41

Unhealthy days / yr worse than typical

Spokane-Spokane Valley, WA 6

Charleston-North Charleston, SC 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Spokane-Spokane Valley, WA metro. Highest Good-day share: 2024 (63.6%, 232 of 365 monitored days).

Year	Good	Moderate	Unhealthy	Median AQI	Max AQI
2020	206	151	2	47	957
2021	178	169	8	51	223
2022	191	164	3	49	185
2023	172	185	2	52	447
2024	232	133	0	44	106
2025	206	149	4	47	243

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Spokane-Spokane Valley, WA (47).

Charleston-North Charleston, SC

Median AQI 47 · 60.3% Good-day share

Columbia, SC

Median AQI 47 · 58.1% Good-day share

Corsicana, TX

Median AQI 47 · 59.2% Good-day share

Dayton, OH

Median AQI 47 · 57.0% Good-day share

Evansville, IN-KY

Median AQI 47 · 57.5% Good-day share

Farmington, NM

Median AQI 47 · 68.0% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Spokane-Spokane Valley, WA's 6 (independent of median AQI).

Appleton, WI

6 unhealthy-or-worse days · median AQI 38

Chicago-Naperville-Elgin, IL-IN-WI

6 unhealthy-or-worse days · median AQI 56

Marquette, MI

6 unhealthy-or-worse days · median AQI 19

Minneapolis-St. Paul-Bloomington, MN-WI

6 unhealthy-or-worse days · median AQI 47

Dallas-Fort Worth-Arlington, TX

5 unhealthy-or-worse days · median AQI 59

Eau Claire, WI

5 unhealthy-or-worse days · median AQI 38

Frequently Asked Questions

How many unhealthy air days does Spokane-Spokane Valley, WA have? ▼

In 2025, the Spokane-Spokane Valley, WA metro area recorded 6 unhealthy air days (4 Unhealthy, 2 Very Unhealthy, 0 Hazardous). The maximum AQI reached 243.

What is the air quality in the Spokane-Spokane Valley, WA metro area? ▼

The Spokane-Spokane Valley, WA metro area has a median Air Quality Index (AQI) of 47, rated "Good." 56.4% of monitored days (206 out of 365) had good air quality in 2025.

Is air quality in Spokane-Spokane Valley, WA getting better or worse? ▼

Air quality in the Spokane-Spokane Valley, WA metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 63.6% (232 of 365 days). Lowest qualifying Good-day share: 2023 at 47.9% (172 of 359 days).

What does AQI 47 mean for health? ▼

An AQI of 47 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 Spokane-Spokane Valley, WA compare to other metro areas? ▼

The Spokane-Spokane Valley, WA metro has 56.4% good air days. Similar metros: Charleston-North Charleston, SC (60.3% good), Columbia, SC (58.1% good), Corsicana, TX (59.2% good).

What is the 90th percentile AQI for Spokane-Spokane Valley, WA? ▼

The 90th percentile AQI for the Spokane-Spokane Valley, WA metro area is 68, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 243 (Very Unhealthy).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Spokane-Spokane Valley, 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, Spokane-Spokane Valley, WA · 2020–2025 Accessed 2026-07-06