i'm personally not sympathetic to the noise argument, since we accept the constant noise of much more plentiful and sometimes-quieter-but-sometimes-louder 2-ton vehicles all over the place. blowers/trimmers are also usually used during business hours where it has to be acceptable to make some noise for work purposes.
in contrast, the pollution argument is quite salient, as @porb121 details[0], and reason enough for the ban. the exhaust pollutants can be smelled surprisingly far away (dozens of feet) and can enter homes through windows and linger. and with blowers at least, raking and sweeping are likely as efficient in most cases and doesn't really save labor/exertion.