Air　pollution　in　vehicle　cabin　environment　has　gained　increasing　concern　recently.This　study　addresses　the　necessity　to　predict　and　regulate　the　emissions　of　volatile　organic　compounds(VOCs)from　interior　materials　to　improve　in-cabin　air　quality.We　focus　on　how　the　selection　of　interior　materials　influences　formaldehyde　concentration　levels　under　multi-source　emission　scenarios.Chamber　experiments　were　conducted　to　determine　the　three　key　parameters　of　formaldehyde　emissions　from　five　typical　interior　materials(carpet,car　door,sealing　strip,and　two　adhesives)using　the　C-history　method.By　applying　a　multi-source　emission　model　with　the　measured　key　parameters,various　cabin　emission　scenarios　are　predicted　and　evaluated.Comparison　of　formaldehyde　concentration　levels　between　experimental　data　and　simulated　results　demonstrates　the　effectiveness　of　the　model.Analysis　based　on　the　model　indicates　that　adhesives　contribute　significantly　to　in-cabin　air　pollution,and　the　impact　of　different　key　parameters　on　the　emission　behaviors　is　different.Adhesives　with　higher　ratio　of　initial　emittable　concentration　to　partition　coefficient　will　prolong　the　emission　period　and　increase　the　health　risks.The　ventilation　requirements　for　different　multi-source　emission　scenarios　are　also　quantified.These　results　underscore　the　critical　role　of　material　selection　in　controlling　formaldehyde　emissions　and　the　necessity　of　developing　low-emitting　materials　to　improve　air　quality　and　occupant　safety　in　vehicle　cabins.