Because when the smoke gets bad, I flip that little switch on my furnace that locks out fresh outside air from coming in. When the smoke lifts, I switch it back.
Absolutely, do not do this. It's ridiculous if you want to slow people down. Put in speed bumps but do not impede traffic and it looks disgusting. It looks stupid. You've already ruined enough streets in this town for bicyclers no more. Do no more use speed bumps if you want to slow people down