Ammonia　emission　reduction　would　bring　potential　spillover　benefits　to　the　improvement　of　surrounding　atmospheric　PM2.　5　pollution，but　the　investigation　of　its　patterns　is　lacking.　The　WRF-CAMx-PSAT　model　was　used　to　quantify　the　spillover　benefits　of　NH3　emission　reduction　in　a　typical　city（Xingtai）on　the　reduction　in　PM2.　5　concentrations　in　the　surrounding　area　and　to　investigate　the　response　patterns　of　PM2.　5　and　its　secondary　inorganic　chemical　components　with　distance　in　different　seasons　and　at　different　NH3　emission　reduction　ratios.　The　results　showed　that：①　the　spillover　benefits　of　NH3　emission　reduction　on　PM2.　5　and　its　secondary　components　in　neighboring　cities　at　different　reduction　ratios　and　the　benefits　showed　a　significant　exponential　decrease　with　the　increase　in　the　relative　distance　between　the　neighboring　receptor　cities　and　the　reduction　cities.　②　The　spillover　benefits　in　January　were　much　higher　than　those　in　July，and　the　reduction　in　PM2.　5　concentration　in　Beijing-Tianjin-Hebei　at　different　reduction　ratios　in　January　was　approximately　7.　4　times　that　in　July.　③　The　spillover　range　was　expanding　with　the　increase　in　emission　reduction　ratio，the　farthest　distance　of　NH+4　and　SO24-　spillover　was　increasing　exponentially，and　the　farthest　distance　of　NO-3　spillover　was　increasing　linearly.　④　The　spillover　range　and　concentration　change　in　NO-3，NH+4，and　SO24-　increased　with　the　increase　in　the　abatement　ratio，in　which　the　spillover　range　of　NO-3　was　the　farthest，approximately　3.　6　times　and　3.　4　times　that　of　NH+4　and　SO24-，and　the　concentration　change　was　the　largest，approximately　2.　6　times　and　7.　3　times　that　of　NH+4　and　SO24-　©　2024　Science　Press.　All　rights　reserved.