Eighty　road　dust-fall　(DF)　monitoring　sites　and　14　background　monitoring　sites　were　established　in　the　Beijing　metropolitan　area,　and　monitoring　was　conducted　from　January　2006　to　December　2008.　The　dust-fall　attributable　to　roads　(Delta　DF)　showed　a　clear　decline　from　2006　to　2008.　Dust-fall　levels　decreased　across　different　road　types　from　freeway　＞　major　arterial　roads　＞　minor　arterial　roads　＞　collector　roads　＞　background　sites.　The　Delta　DF　showed　declines　of　65%,　55%,　65%　and　84%　respectively　for　freeways,　major　arterial,　minor　arterial　and　collector　roads　from　August　2007　to　August　2008,　and　declines　of　77%,　76%,　82%　and　82%　between　August　2006　and　August　2008.　The　Delta　DF　declined　by　80%,　79%,　82%　and　69%　for　freeways,　major　arterial,　minor　arterial　and　collector　roads　respectively　between　September　2007　and　September　2008,　and　declined　by　84%,　88%,　80%　and　81%　between　September　2006　and　September　2008.　Eighty　samples　were　collected　in　August　2007　and　August　2008　and　analyzed　for　silt　loading.　PM10　emission　factors　and　emission　strengths　were　calculated　using　the　AP-42　model.　The　silt　loading　reduced　by　77%,　35%,　61%,　59%　and　75%　for　freeways,　major　arterial,　minor　arterial,　collector　and　local　roads　respectively.　The　PM10　emission　factors　were　reduced　by　57%,　15%,　36%,　51%　and　61%　and　the　PM10　emission　strength　declined　by　70%.　40%,　55%,　65%　and　72%　for　freeways,　major　arterial,　minor　arterial,　collector　and　local　roads　respectively　between　August　2007　and　August　2008.　The　decline　is　consistent　with　the　reduction　in　road　dust-fall.　(C)　2009　Elsevier　Ltd.　All　rights　reserved.