Metro area air quality · 2025
Longview, WA
Median AQI 22 (Good). 90.4% of monitored days rated Good across this metro's EPA monitoring network.
- 22
- Median AQI
- 90.4%
- Good-air days
- 0
- Unhealthy days
- 87%
- Cleaner than US metros
Longview, WA posted a 2025 median AQI of 22 (Good) with 90.4% Good days
According to the U.S. EPA Air Quality System, the Longview, WA CBSA recorded a median AQI of 22 across 250 monitored days in 2025, with 90.4% 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 Longview, WA CBSA's 90.4% Good-day share places it cleaner than 87% of US metros in 2025.
- Closest median-AQI peer
- Aberdeen, WA (97.3% Good, median AQI 22) is the closest nationwide median-AQI peer to Longview, WA.
- 2020–2025 Good-day shift
- Longview, WA's Good-day share moved -1.5 points from 2020 to 2025 (median AQI +1).
- Median AQI
- Median AQI: 22
Aggregated from EPA Air Quality System (2025), 250 monitored days. EPA AQS →
The verdict
Longview, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (90.4% of 250 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 22 and 90.4% of 250 monitored days in the Good band.
- 22
- median AQI · Good
- 90.4%
- days rated Good
- 87%
- cleaner than US metros
- 72
- 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
- Longview, WA metro's Good-day share fell from 95.4% to 90.4% between the 2024 and 2025 EPA annual releases, a change of -5.0 percentage points.
Longview, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (90.4% of 250 monitored days). Signature read: 90.4% 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 250 measured days in 2025 (Good / Excellent). The monitored-day split lands at 226 Good (90%), 24 Moderate (10%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 49; the highest single-day reading hit 72 (Moderate).
Across 2020–2025, Good-day share shifted -1.5 points and median AQI moved +1 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Aberdeen, WA (97.3% good, AQI 22); Bremerton-Silverdale, WA (95.5% good, AQI 22); Gardnerville Ranchos, NV (91.1% good, AQI 22).
Air Quality Summary
Median AQI
22
Good
Good Days
90.4%
226 of 250 days
Max AQI
72
Moderate
Health Grade
Excellent
90th pct: 49
AQI Day Breakdown (2025)
Distribution of 250 monitored days across EPA AQI categories.
Good
226
90%
Moderate
24
10%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Longview, WA metro area's air quality is rated Excellent based on 90.4% 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 Longview, WA metro compare?
How Longview, WA compares
5-Year Air Quality Trend
Air quality is stable in the Longview, WA metro. Highest Good-day share: 2021 (97.3%, 355 of 365 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 331 | 26 | 3 | 21 | 282 |
| 2021 | 355 | 10 | 0 | 21 | 64 |
| 2022 | 316 | 45 | 0 | 21 | 144 |
| 2023 | 323 | 42 | 0 | 22 | 89 |
| 2024 | 349 | 17 | 0 | 22 | 67 |
| 2025 | 226 | 24 | 0 | 22 | 72 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Longview, WA (22).
Aberdeen, WA
Median AQI 22 · 97.3% Good-day share
Bremerton-Silverdale, WA
Median AQI 22 · 95.5% Good-day share
Gardnerville Ranchos, NV
Median AQI 22 · 91.1% Good-day share
Steamboat Springs, CO
Median AQI 22 · 93.7% Good-day share
Bend-Redmond, OR
Median AQI 23 · 89.3% Good-day share
Cañon City, CO
Median AQI 23 · 93.4% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Longview, WA's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Albany-Schenectady-Troy, NY
0 unhealthy-or-worse days · median AQI 41
Frequently Asked Questions
How many unhealthy air days does Longview, WA have? ▼
What is the air quality in the Longview, WA metro area? ▼
Is air quality in Longview, WA getting better or worse? ▼
What does AQI 22 mean for health? ▼
How does Longview, WA compare to other metro areas? ▼
What is the 90th percentile AQI for Longview, WA? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Longview, 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, Longview, WA · 2020–2025