Thisstudyexaminestheeffectsofenvironmentalregulationsonindustrialactivitiesbyleveragingaquasi-naturalexperimentinChineseprefectures.Theresearchutilizesauniquepolicyimplementationthatcreatedvariationinregulatorystringencyacrossregions,allowingforcausalinference.Byanalyzingcomprehensiveindustrialandenvironmentaldata,thepaperprovidesempiricalevidenceonhowstricterenvironmentalpoliciesinfluenceindustrialoutput,productivity,andfirmbehavior.Thefindingscontributetotheongoingdebateaboutbalancingeconomicgrowthwithenvironmentalprotection,offeringinsightsparticularlyrelevantfordevelopingeconomiesundergoingrapidindustrialization.Thequasi-experimentalapproachhelpsaddressendogeneityconcernscommoninenvironmentalregulationstudies,strengtheningthevalidityoftheresults.