What are the effects of trees/plants on PM2.5 pollution? Are there plants that catch more? Do damp leaves catch more?
Does watering plants with a mist pull extra microparticles out of the air vs a stream? (if so, Do plants mind or benefit from the extra stuff in their water?)
Are there any "permaculture" solutions for air filtration? Could a filter caked with pm2.5 black carbon and whatnot be useful for anything else? Can I manufacture a filter that will reduce pm2.5 using home grown plant materials?
What if I converted a wall of my shed into all filtration material, made it airtight, and pushed air out the other side of the shed under solar power? How would 100sqft of filter give flexibility of filter media?
If I made a giant/parallelized bong in my backyard that constantly pulled air through water to try to catch microparticles, how big would it have to be to have an appreciable effect?
Thats... So many really good questions. The only one I can answer is that rain definitely reduced the pm2.5 levels at our house. Before it rained, the smoke was below the tops of the trees and according to my phone, we were in the 150+ range. After the rain, it was easier to breathe and no warning on the phone. So mist will likely help better than a stream. I imagine (but lack evidence for) wet leaves remove more particles from the air if there is a breeze. Im not sure how you would go about devising an experiment to test for that though. I think your bong would have to be very big to have an appreciable effect, but you might have a better time of it if you can make it like a wall you put on the upwind side of your property so it filters air coming in.