Air Quality Index in Portland, OR

Portland, OR

Portland, known for its vibrant arts scene, lush green spaces, and eco-conscious culture, is nestled in the Pacific Northwest's Willamette Valley. The city's air quality index (AQI) typically reflects its clean and green reputation, often maintaining healthy levels due to its proximity to forests and progressive environmental policies. However, seasonal wildfires in the region can temporarily impact air quality, making it important for residents and visitors to monitor AQI levels during the summer and fall months.

Air Quality Index

January 23, 2025

Moderate

Members of sensitive groups, such as children, the elderly, and individuals with respiratory conditions, may experience adverse health effects. The general population is less likely to be affected.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 24, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 25, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 26, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 27, 2025

Good

Air quality is ideal, with minimal or no risk to health.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 28, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

5-Day Air Quality Index Forecast in Portland, OR

Tips to Protect Yourself from Unhealthy Air Quality in Portland, OR

Keep windows and doors closed, and use an air purifier with a HEPA filter to maintain clean indoor air.

If you need to go outside during high pollution events, such as wildfire smoke, wear a properly fitted N95 or KN95 mask. These masks can filter out fine particulate matter (PM2.5), which is a common pollutant during such events.

Regularly check the air quality index and adjust your activities accordingly, especially during "unhealthy" or "hazardous" levels.

FAQ

Frequently Asked Questions

When is AQI usually the worst in Portland?

AQI in Portland tends to be the worst during late summer and early fall (August to October) due to wildfire smoke from Oregon and neighboring states. Temperature inversions during winter can also lead to temporary spikes in pollution, trapping emissions close to the ground.
What are common pollutants that impact AQI in Portland?

The most common pollutants affecting Portland's AQI are fine particulate matter (PM2.5) and ground-level ozone. PM2.5 is typically associated with wildfire smoke and vehicle emissions, while ozone levels may rise on hot, sunny days due to photochemical reactions involving vehicle and industrial emissions.
Are there specific areas in Portland with better AQI?

Generally, areas closer to green spaces like Forest Park or farther from major highways and industrial zones tend to have better air quality. Suburban neighborhoods in the western and southern parts of the city often experience cleaner air compared to central or east Portland, which can see higher pollution levels from traffic and urban density.