SmogRank / World / United States / Oregon / February 2024

Most polluted cities in Oregon, United States, February 2024

40 cities in Oregon, United States ranked by their average PM2.5 over the 29 days. Worst: Milwaukie at 8.9 µg/m³, #849 of 2,437 cities in the world. Cleanest: Florence at 2.1. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for one of these days. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Milwaukie 0% 0.75%0
Every city in Oregon, United States ranked for February 2024, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, February 2024 · All cities in United States, February 2024 · Oregon now

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SmogRank, most polluted cities in Oregon, United States, PM2.5, February 2024, smogrank.com/us/region/oregon/history/2024-02 (accessed 6 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.