Worst air pollution Longview, today and tomorrow
Today (30 August): Air quality in Longview is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 19.9/100).
Tomorrow (31 August 2026): Air quality in Longview is fair. AQI worsens to fair; NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 38.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Longview's air quality in Washington State reflects the lower Columbia River valley position near the Oregon border, with the Weyerhaeuser and International Paper industrial forest operations and the Port of Longview generating elevated PM2.5 and NOₓ alongside vehicle traffic on SR-432. The Columbia River estuary provides ventilation, while the surrounding Cascades and Coast Range hills create topographic variation and summer wildfire smoke from Pacific Northwest forests is an increasingly severe seasonal concern.
Today - 30 August | Pollution peaks at 10:00
AQI:
Good
19.9/100
PM2.5 (fine particles):
Good
6.8/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
9.6/100
O3 (ozone):
Good
19.9/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.6/100
PM1 (ultrafine particles):
Good
2.7/100
Levels show the poorest local air quality during the day
Tomorrow - 31 August | Pollution peaks at 23:00
AQI:
Fair
38.1/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Fair
38.1/100
O3 (ozone):
Good
19.3/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
4.3/100
Pollen forecast in Longview
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Frequently Asked Questions
Is air quality bad in Longview right now?
On 30 August 2026, overall air quality in Longview is good. AQI is the main air quality indicator at 19.9/100. Pollution peaks around 10:00 AM (O3: 19.9/100).
Will air quality be worse tomorrow in Longview?
On 31 August 2026, air quality conditions in Longview will be worse than today, with AQI forecast at fair at 38.1/100. Pollution peaks around 11:00 PM (NO2: 38.1/100).
When is air pollution at its worst in Longview?
Air quality in Longview shifts across the year, as winter and spring bring the cleanest air, as frequent rain and consistent onshore wind clear pollution quickly; by contrast, by late summer, wildfire smoke can override the region's usual clean-air advantage for days at a time. Prevailing onshore winds usually keep pollution moving rather than letting it settle.
Are air quality levels in Longview based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 30 August 2026 at 14:32 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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