I will be honest I could give a hoot about treated lumber I use it all of the time in my outside projects.
The amount of pollution many people breath in everyday far exceeds anything you will get from treated lumber.
I thought I was going to die when I had to go outside in LA one time.
Landing there looked like we were landing in a BBQ grill but it wasn't BBQ.
That's why the rich folks live up in the hills above the haze.
Worth