b'FOGHORN FOCUS Inthiscomprehensiveexploration,weexploreonesolu- Active DPFs emerge astion:dieselparticulatefilters(DPFs)andhighlightingtheirroleinusheringinaneweraofsustainablemarinepractic- a robust and low- es.Byunderstandingtheregulatorylandscape,economicandhealthimpactsofDPMemissionsandthepotentialof maintenance solution in DPFtechnology,weaimtoprovideinsightintohowthemaritimeindustrycannavigatetowardscleanerandmore the fight against airenvironmentallyfriendlyoperations. pollution. These DPFs REGULATORY LANDSCAPE bodiesaretaking can achieve removal rates Today,governmentsandinternationaldecisiveactiontoaddressmarinepollution.Initiativessuch greater than 85 percent. astheInternationalMaritimeOrganizations(IMO)decar-bonization objectives and CARBs Commercial HarborCraftRegulationunderscorethecommitmenttoreducingemissionsfrommarinevessels.Theseregulationsarenotmere guidelines but legal frameworks that mandate theadoption of cleaner technologies, driving industry-wide takestime.Manufacturersmustundergothoroughtestinginnovationandtransformation. beforetheirproductsareapprovedforsale.Forinstance,in2018,theInternationalMaritimeOrgani- EXPLORING MARINE BLACK CARBONzationsetforthadefinitivedecarbonizationobjectivefor CONTROL STRATEGIESitsmembernations:Achieveaminimumofa50percent Inaddressingthechallengeofmarineblackcarbon,strat-reductionintotalannualgreenhousegas(GHG)emissions egies can be deployed both pre- and post-combustion.by 2050, relative to 2008 levels. The United States has Pre-combustion solutions involve minimizing BC emis-recentlyjoinedtheranksofthesenations.Inthenewly sionsthroughmethodssuchasfuelswitching,fueltreat-unveiledU.S.NationalBlueprintforTransportationDe- mentoradjustmentstoengineoperationsandfueldeliverycarbonization, the current Administration announced systems(CARBsregulationrequirestheuseofR99dieselapolicygoalofnet-zeroGHGemissionsfromthetrans- fuel). Alternatively, post-combustion approaches focusportationsectorby2050.Thiscommitmentisparticularly onextractingBCemissionsdirectlyfromtheexhaustgassignificantgiventhatthetransportationsectorcurrently stream.Anadditionalandeffectivestrategyinvolvesthecontributestoone-thirdofallU.S.emissions. useofdieselparticulatefilters.In2022,theCaliforniaAirResourcesBoard(CARB)gave THE ROLE OF DIESEL PARTICULATE FILTERSthegreenlighttorevisionsinitscommercialharborcraft At the forefront of emission reduction technology areregulation,targetingemissionreductionfromcommercial dieselparticulatefilters.TheseinnovativedevicesofferaharborcraftoperatinginproximitytoCaliforniascoast- robustsolutionforcapturingparticulatematterfromex-line.Theprimarygoalistoenhancepublichealthinneigh- haustgases,therebymitigatingtheenvironmentalimpactboringcommunities.Californiastillawaitsadecisionby ofmarineoperations.Itsimportanttonote,notallDPFstheU.S.EnvironmentalProtectionAgencyastowhetherit arethesame.canbeginenforcingthe2022amendments.CARBassertsthatby2035,theseamendmentswillyieldan89percent Passive DPFsdecreaseindieselsootandasignificant54percentreduc- PassiveDPFreferstofilterswithlimitedself-cleaningortioninnitrogenoxides. self-regeneratingcapabilities.Thesefilterscanonlyregen-erate under specific conditions, typically when exhaustSustainablesolutionstomeettheproposedregulationsare temperaturesareelevated,andNOx/PMratiosarewith-beingexplored.However,itsimportanttonotetheprocess innarrowparameters.KeepinmindthatpassivesystemsFOGHORN 10'