As　the　logistics　and　plate　capital　of　China,　the　sources　and　regional　transport　of　O-3　in　Linyi　are　different　from　those　in　other　cities　because　of　the　significant　differences　in　industrial　structure　and　geographical　location.　Twenty-five　ozone　pollution　episodes　(OPEs,　52　days)　were　identified　in　2021,　with　a　daily　maximum　8-h　moving　average　O-3　concentration　(O-3-MDA8)　of　184.5　+/-　22.5　mu　g/m3.　Oxygenated　volatile　organic　compounds　(OVOCs)　and　aromatics　were　the　dominant　contributors　to　ozone　formation　potential　(OFP),　with　contributions　of　approximately　23.5-52.7%　and　20.0-40.8%,　respectively,　followed　by　alkenes,　alkanes,　and　alkynes.　Formaldehyde,　an　OVOC　with　high　concentrations　emitted　from　the　plate　industry　and　vehicles,　contributed　the　most　to　OFP　(22.7　+/-　5.5%),　although　formaldehyde　concentrations　only　accounted　for　9.4　+/-　2.7%　of　the　total　nonmethane　hydrocarbon　(NMHC)　concentrations.　The　source　apportionment　results　indicated　that　the　plate　industry　was　the　dominant　O-3　contributor　(27.0%),　followed　by　other　sources　(21.6%),　vehicle-related　sources　(18.0%),　solvent　use　(16.9%),　liquefied　petroleum　gas　(LPG)/natural　gas　(NG)　(8.8%),　and　combustion　sources　(7.7%).　Therefore,　there　is　an　urgent　need　to　control　the　plating　industry　in　Linyi　to　mitigate　O-3　pollution.　The　backward　trajectory,　potential　source　contribution　function　(PSCF),　and　concentration　weighted　trajectory　(CWT)　models　were　used　to　identify　the　air　mass　pathways　and　potential　source　areas　of　air　pollutants　during　the　OPEs.　O-3　pollution　was　predominantly　affected　by　air　masses　that　originated　from　eastern　and　local　regions,　while　trajectories　from　the　south　contained　the　highest　O-3　concentrations　(207.0　mu　g/m(3)).　The　potential　source　area　was　from　east　and　south　Linyi　during　the　OPEs.　Therefore,　it　is　critical　to　implement　regional　joint　prevention　and　control　measures　to　lower　O-3　concentrations.