It is illegal to sweep dirt from your house into the public street.

The Law Explained

You cannot dispose of your household dust bunnies and debris by aggressively sweeping them off your porch and into the municipal roadway. Originating in the days before paved roads and street sweepers, this public nuisance law was meant to prevent neighbors from simply passing their filth onto public thoroughfares. Citizens were expected to properly bag or burn their refuse.