The Air Quality Index in my town is currently 260 (very unhealthy) due to a surge in wildfires in western Canada and the northwest US. There are additional smaller fires not shown on this map at this zoom level.
From the interactive map it looks like the worst air in the world right now.
There’s already maroon after purple starting at 300, but that’s the last one since at that point it’s just plain hazardous already. But considering it was over 800 when I was in Beijing several years ago, and it was over 600 in Spokane WA where a friend lives and several other places this weekend, we probably need a point at which we evacuate people and a color for that.