Pretty sure we all breathe unhealthy air, you can't get away from the hundreds of millions of automobiles flooding pubic space with pollution.

Related:

How safe is the air to breathe? 50M people in the US don't know - https://news.ycombinator.com/item?id=43767898 - April 2025

So if the Canadian wildfires caused a lot of this, how bad are things in Canada?