These changes generally look like they should provide a positive trend for the air quality and pollutant issues of constituents.  It would be good to explicitly add leaves and tree to the latter half of 9VAC5 140-30 A.5 so as to remove possible ambiguity in interpretation.  e.g., "collection service for such trimmings" would leave less interpretation if stated as "collection service for leaves, tree, and such trimmings ...."