Ship　emissions　contribute　significantly　to　the　deterioration　of　air　quality,　while　their　impacts　on　ambient　PM2.5　and　depositions　have　not　been　comprehensively　evaluated.　This　is　especially　true　for　China　because　it　has　a　long　coastline,　busy　shipping　routes　and　many　large　ports.　To　fill　this　gap,　this　study　applied　the　SMOKE/WRF/CMAQmodeling　system　to　quantifying　the　impacts　of　ships　on　PM2.5　compositions,　annual　and　seasonal　contribution　to　PM2.5　as　well　as　the　wet　and　dry　deposition　of　nitrogen　and　sulfur　compounds　over　the　land　areas　in　YRD　region　for　2014.　The　results　showed　that　4.0%　of　annual　PM2.5　concentrations　over　the　land　areas　could　be　explained　by　ship　emissions　and　the　largest　contribution　could　reach　up　to　35.0%　in　port　areas.　Temporally,　the　contribution　to　PM2.5　exhibited　an　obviously　seasonal　variation.　The　highest　contribution　was　predicted　in　autumn　(62%),　followed　by　summer　(5.4%),　spring　(3.6%)　and　winter　(12%)　for　the　land　areas.　Spatially,　the　contribution　reached　up　to　13.6%　along　the　coastline　and　dropped　to　2.1%　300　km　inland.　As　for　the　impacts　on　PM(2.5　)components,　the　primary　components　were　relatively　small　and　increased　mainly　along　the　shipping　routes　and　the　Yangtze　River,　whereas　the　secondary　components　played　a　more　important　role　in　both　water　and　land　areas.　The　sulfur　deposition　due　to　ship　emissions　was　occurred　generally　along　the　shipping　routes　and　was　dominated　by　the　dry　SO2　deposition.　The　nitrogen　depositions,　on　the　contrary,　was　observed　not　only　along　the　shipping　routes　but　also　extend　to　wide　land　areas.　Further　investigation　revealed　that　ship　emissions　have　caused　an　evident　increase　of　dry　nitrogen　deposition　in　NO2　and　HNO3,　while　a　slight　decrease　in　NH3　over　YRD　region.These　results　indicated　that　comprehensive　regulations　of　ship　emissions　arc　required　considering　their　adverse　effects　on　the　ambient　concentration　of　PM(2.5　)and　the　deposition　of　sulfur　and　nitrogen.　(C)　2018　Elsevier　B.V.　All　rights　reserved.