What is the air quality in Hillsboro OR?

Hillsboro OR, United States of America has an annual US AQI of 41 (Reasonable) and average PM2.5 of 7.7 µg/m³, ranking #304 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Hillsboro OR?

June is typically the cleanest month (AQI 31) and November the most polluted (AQI 58).

Where does Hillsboro OR's air quality data come from?

PM2.5: 1998–2026 (monitors 1999–2026, satellite 1998–2000, 2003–2005; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

Hillsboro OR, United States of America — Air Quality & Clean City Guide 2026

Hillsboro OR Air Quality Data

Global rank	City	Continent	AQI	PM2.5
304	Hillsboro OR, United States of America	North America	AQI 41	PM2.5 7.7 µg/m³