Wearable　ventilation　devices　can　reduce　respiratory　exposure　in　polluted　environments.　This　study　investigates　a　neck-side　ventilation　system　using　Computational　Fluid　Dynamics　(CFD)　simulations　and　experimental　validation.　The　system　delivers　clean　air　through　dual　neck　vents,　deflecting　along　the　face　under　the　Coanda　effect　to　form　a　clean　air　layer　around　the　nose　and　mouth,　reducing　exposure　to　pollutants.　Key　factors,　including　roll　angles,　inlet　pitch　angles,　and　air　speeds,　were　analysed　for　their　impact　on　pollutant　exposure　reduction　(PER).　Results　show　that　at　roll　angles　of　30　degrees　or　45　degrees,　the　Coanda　effect　deflects　and　converges　the　airflow　in　front　of　the　face,　forming　a　protective　air　layer.　The　pitch　angle　affects　the　convergence　point,　with　40　degrees　and　45　degrees　angles　optimising　the　clean　air　layer＇s　position　around　the　breathing　zone.　Airflow　velocity　has　a　secondary　impact　when　optimal　roll　and　pitch　angles　are　chosen.　However,　in　suboptimal　combinations,　higher　airflow　velocities　improve　pollutant　shielding,　except　when　the　roll　angle　is　0　degrees,　where　higher　speeds　worsen　pollutant　entrainment　into　the　breathing　zone.　The　system　achieves　a　maximum　PER　of　75.2　%　at　a　roll　angle　of　30　degrees　and　a　pitch　angle　of　45　degrees　This　study　confirms　the　potential　of　neck-side　ventilation　for　respiratory　protection　and　provides　guidance　for　optimising　design　parameters　to　improve　performance　in　polluted　environments.