I went to a popup at Devil Mountain Wholesale Nursery the other day that was Stew Winchester talking about trees for our various climate conditions. Great info, good handouts, quality plant geeking.
I had Stew for some classes at Merritt and highly appreciate his geekery. You can go on what look like effing insane horticultural back packing trips with him. If you are interested you can find him here.
On his handout, Considerations for Positive Tree Performance, #3 is Biogenic Emissions. Which, I confess, I have never before considered. He mentioned that the Smokey Mountains are so named because of the hazy/smokiness you often see and that that hazy/smokiness is caused by trees. So, yeah, you bet your ass I googled that as soon as I got back to the office. Maybe it's a bit of common knowledge but I had no idea.
That's pretty cool. Biogenic emissions are emissions from natural sources, such as plants and trees. The California Air Resources Board (CARB) estimates emissions of biogenic volatile organic compounds (BVOCs) from vegetation for natural areas, crops, and urban vegetation. Usually I think about plant emssions as good. I have a book called How to Grow Fresh Air that goes in to detail about which plants to use indoors. I never put in to practice anything in this book because my cats eat all plants and knock things over so this house will forever be plantless.