Pittsburgh does not have the best air quality, but I was surprised to find it listed as better than SF in this article which is overall negative on Pittsburgh [0]. Neither is in a good place, being in the top 15 most worst cities in the country for air quality.

If you want some charts it looks it really does very by section of the city as well [1].

I know people in the area and they responded by getting a Purple Air quality monitor and indoor air purifiers. The simply staying inside when the it was particularly bad day. Which definitely echos China’s big cities, and not in a good way.

0 - https://www.post-gazette.com/local/2019/04/24/Pittsburgh-reg...

1 - https://www.wesa.fm/post/pittsburghs-air-quality-better-past...