Gives a method to assess the PM[10] and PM[2,5] efficiency of road sweepers. PM[10] and PM[2,5] efficiency includes a sweeper's ability to: - Remove and capture PM[10] and PM[2,5] particulate matter, and coarse size fractions, from typical urban road surfaces; - Minimize the amount of airborne and entrained PM[10] and PM[2,5] particulate matter resulting from the sweeping process.