Worst air pollution Lan Su Chinese Garden - Portland, today and tomorrow
Today (15 July): Air quality in Lan Su Chinese Garden is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 41.5/100).
Tomorrow (16 July 2026): Air quality in Lan Su Chinese Garden is fair. AQI worsens to fair; NO2 decreases to good; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 AM (O3: 36.7/100). 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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Portland's Lan Su Chinese Garden air quality reflects the downtown Portland Chinatown position, with vehicle traffic on NW 3rd Avenue and the surrounding mixed residential and commercial character contributing local sources. Summer wildfire smoke from Oregon and Washington forests is the primary seasonal concern, while the garden's interior pond and plantings provide natural filtration and the walled garden maintains better conditions than the surrounding busy streets throughout most of the year.
Today - 15 July | Pollution peaks at 07:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
7.2/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Fair
22.1/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Good
5.9/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 04:00
AQI:
Fair
36.7/100
PM2.5 (fine particles):
Good
6.7/100
PM10 (coarse particles):
Good
2.6/100
NO2 (nitrogen dioxide):
Good
10.7/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Good
6.2/100
Other Landmarks in Portland
Frequently Asked Questions
Is air quality bad in Lan Su Chinese Garden right now?
On 15 July 2026, overall air quality in Lan Su Chinese Garden is fair. NO2 is the main pollutant at 22.1/100. Pollution peaks around 7:00 AM (O3: 41.5/100).
Will air quality be worse tomorrow in Lan Su Chinese Garden?
On 16 July 2026, air quality conditions in Lan Su Chinese Garden will be similar to today, with AQI forecast at fair at 36.7/100. Pollution peaks around 4:00 AM (O3: 36.7/100).
When is air pollution at its worst in Lan Su Chinese Garden?
Lan Su Chinese Garden experiences the same seasonal air quality swings as the rest of Portland, as spring is often the freshest stretch, sandwiched between winter rain and summer fire season; by contrast, late summer wildfire smoke is the biggest concern, sometimes pushing air quality into unhealthy territory for days at a stretch. Winter temperature inversions can briefly trap wood-smoke in low-lying valleys, but these episodes are usually short-lived.
Are air quality levels in Lan Su Chinese Garden 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