Where is pollution coming from? Cars generate lot of noise and pollution when they through city streets or on highways. Motorcycles can be especially loud if nobody bother to muffle them.
This is a reference to the NIMBY/YIMBY fight, where the YIMBY position is that most non-single-family-home developments, other than the super high end, have been effectively been made illegal through a combination of zoning laws, neighborhood review processes that add extraordinary costs, unreasonable requirements and delays, and other arbitrary veto points.