Following　the　Internet,　the　Internet　of　Things　(IoT)　has　become　another　revolutionary　technology　in　recent　years.　In　recent　years,　Internet　of　Things　technology　has　been　applied　to　various　industries　such　as　agricultural　production,　intelligent　transportation　and　industrial　production,　including　the　wireless　system　network　under　the　Internet　of　Things　technology.　The　problem　of　particulate　matter　pollution　has　become　more　and　more　concerned.　However,　how　to　quickly　and　accurately　detect　particulate　matter　concentration　has　become　a　research　hotspot.　The　traditional　filter　membrane　weighing　method　and　ray　absorption　method　have　many　limitations,　which　cannot　meet　the　requirements　of　fast　and　accurate.　The　measurement　of　particle　mass　concentration　by　light　scattering　method　is　a　non-contact　detection　method　of　particle　mass　concentration.　In　this　paper,　light　scattering　methods　are　combined　with　the　theory　of　IoT　wireless　systems　to　discuss　the　photophysical　parameters　of　tiny　particles,　such　as　particle　size　and　density.　This　paper　mainly　studies　the　formation　mechanism,　particle　detection　principle　and　numerical　simulation,　and　the　data　intelligent　analysis　of　the　optical　and　physical　parameters　of　the　particles.　The　particle　size　distribution,　average　particle　size　and　density　were　obtained　by　CCD　photosensor　experiment.　The　experimental　results　show　that　the　optical　IP:　203　8　109　10　On:　Sat　04　N　v　2023　01:00:18　parameters　of　different　particle　sizes　are　accurate　and　relable.　Copyright:　Amer　can　Scientifi