SmogRank / World / United States / Oregon / August 2023
Most polluted cities in Oregon, United States, August 2023
41 cities in Oregon, United States ranked by their average PM2.5 over the 31 days. Worst: Ashland at 47.7 µg/m³, #12 of 1,926 cities in the world. Cleanest: Florence at 4.2. A city needs measurements on 70% of the days to be ranked.
About 74.2K people in these 7 cities breathed unhealthy air on an average day of August 2023.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
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, August 2023 · All cities in United States, August 2023 · Oregon now
Use this board
SmogRank, most polluted cities in Oregon, United States, PM2.5, August 2023, smogrank.com/us/region/oregon/history/2023-08 (accessed 6 Oct 2026).
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.