Worst air pollution Pasco, today and tomorrow
Today (15 July): Air quality in Pasco is medium. AQI, NO2, and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 42.8/100).
Tomorrow (16 July 2026): Air quality in Pasco is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 AM (O3: 41.5/100). 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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Pasco's air quality reflects the Columbia Basin's partial topographic enclosure between the Horse Heaven Hills and the Rattlesnake Hills in the Tri-Cities area, with vehicle emissions from US-395 and surrounding agricultural operations contributing local sources. Summer wildfire smoke from surrounding Washington and Oregon forests is an increasingly severe seasonal concern, while winter temperature inversions and agricultural dust from the irrigated Columbia Basin contribute the primary air quality influences.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
42.8/100
PM2.5 (fine particles):
Good
13.1/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Medium
41.4/100
O3 (ozone):
Medium
42.8/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.6/100
PM1 (ultrafine particles):
Good
15.1/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 04:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
12.6/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Fair
22.3/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Good
14.3/100
Pollen forecast in Pasco
View pollen forecastFrequently Asked Questions
Is air quality bad in Pasco right now?
On 15 July 2026, overall air quality in Pasco is medium. AQI is the main air quality indicator at 42.8/100. Pollution peaks around 9:00 AM (O3: 42.8/100).
Will air quality be worse tomorrow in Pasco?
On 16 July 2026, air quality conditions in Pasco will be worse than today, with NO2 forecast at fair at 22.3/100. Pollution peaks around 4:00 AM (O3: 41.5/100).
When is air pollution at its worst in Pasco?
Pasco experiences a distinct seasonal swing in air quality. Typically, the wet winter and spring months are generally the cleanest, with regular rain limiting particulate buildup, while by late summer, wildfire smoke can override the region's usual clean-air advantage for days at a time. Coastal areas see relatively little of the smoke that can settle into inland valleys during fire season.
Are air quality levels in Pasco 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app