During　the　COVID-19　pandemic,　Chinese　universities　implemented　many　interventions　against　SAR-CoV-2　transmission.　Close　contact　is　thought　to　be　a　major　transmission　route.　However,　the　effect　of　interventions　relating　to　university　closures　on　exposure　risk　via　close　contacts　among　university　students　is　still　poorly　understood.　In　July　2022,　an　online　survey　from　2,400　university　students　in　Beijing　and　Shanghai　was　conducted.　Based　on　real　human　behaviors,　we　evaluated　the　viral　exposure　risk　during　both　periods　of　university　closures　and　non-closures.　The　residence　(home　and　dormitory)　and　catering　places　were　main　viral　exposure　places　for　university　students.　During　university　closures,　the　daily　exposure　risk　for　university　students　decreased　by　39.6%　compared　with　the　non-closure　period,　40.7%　for　residents　and　64.7%　for　non-residents.　©　2024　18th　Conference　of　the　International　Society　of　Indoor　Air　Quality　and　Climate,　INDOOR　AIR　2024　-　Conference　Program　and　Proceedings.　All　rights　reserved.