Portland hit well over 500 in 2020, and I believe I remember some peak readings of around 800, but I can't find them now. https://www.oregonlive.com/news/2020/

Portland hit well over 500 in 2020, and I believe I remember some peak readings of around 800, but I can't find them now. https://www.oregonlive.com/news/2020/09/portlands-air-quality-is-off-the-charts-on-sunday-and-much-of-oregon-is-just-as-bad-due-to-wildfires.html https://www.oregonlive.com/news/2020/09/portlands-air-qualit...