There's only 2 things I miss since leaving the Pacific Northwest, the forests and the mountains. It's hard to beat mountain forest air.

Have you seen the NASA study on indoor plants and filtration? Highly recommend it. The degree to which it's effective on a home scale... eh... Still, it doesn't hurt to do. Again, I could be crazy, but having a few of these in a city environment does drastically change the smell of a house for the better.

https://ntrs.nasa.gov/citations/19930073077

I do recommend searching "nasa indoor plant list" for easier lists if you just want to quickly see which ones.