I think the distributed nature of Mastodon keeps government control from being an issue. It would be kind of cool as a space for citizens to ask for assistance or air grievances while giving the politicians an officially owned space for things like announcements.
I’m going to take a different approach than most of the other comments here: you can’t. Microplastics are in the air and a large chunk of it comes from car tire residue. You’re breathing it, likely right now. Research is still in the early phases and we just don’t know how bad it is yet, both from the proliferation and the impact side of things.
Source is Breaking the Plastic Wave and Overview on the occurrence of microplastics in air.