Street sweeping can earn communities only a modest pollutant reduction credit.  While street sweepers may reduce trash or toxic contaminants, which are abundant in urban street solids, older technologies that use mechanical broom sweepers do little to reduce nutrients and sediment. While these mechanical sweepers may pick up large particles, they do not pick up the smaller particles that impact water quality.  Upgrading to more effective technologies like Regenerative Air Sweepers and Vacuum Assisted Sweepers can help increase pollution reduction efficiency.  The Chesapeake Stormwater Network provides a variety of resources on urban street sweeping.  In 2016, the final recommendations of the Expert Panel to Define Removal Rates for Street and Storm Drain Cleaning Practices were accepted. Resources include a fact sheet, a webcast, and the expert panel report.