Daylight　refers　to　a　free　and　valuable　resource　exhibiting　photometric　and　radiometric　features,　and　the　physical　parameters　commonly　used　to　represent　its　features　are　irradiance　and　illuminance.　They　are　both　obtained　by　the　spectral　power　distribution　(SPD)　of　global　irradiance,　demonstrating　that　values　noticeably　affect　indoor　thermal　and　luminous　environments.　Nevertheless,　outdoor　particulate　matter　(PM)　significantly　affects　SPD　conditions,　and　two　relative　spectral　notions,　i.e.,　percentage　of　spectral　irradiance　(PSIr)　and　percentage　of　spectral　illuminance　(PSIl),　were　proposed　to　study　the　effects　of　PM10　concentrations　in　radiometry　and　photometry　with　a　field　measurement,　Beijing.　As　a　result,　the　strong　impact　of　PM10　on　PSIr/　PSIl　can　be　noticed　in　the　range　(380　to　540　nm)　(P-value　10　and　PSIr/　PSIl　based　on　regression　analysis.　With　this　wavelength,　PSIr　varies　from　0.29　to　0.25%,　and　PSIl　ranges　from　0.48　to　0.42%　with　the　increase　of　PM10　concentrations　from　0.01　to　0.098　mg/m3.　With　the　verification　of　the　model,　several　bands　were　further　analyzed　to　comprehensively　verify　the　monotonic　correlations,　and　the　band　ranging　480　~　520　nm　were　reasonably　proved　that　PSIr/PSIl　and　PM10　can　be　well　indicated　by　each　other.　As　influenced　by　the　complexity　of　spectral　transmittance　through　the　glazing,　the　mutual　characterization　between　solar　spectrum　and　particulate　matters　can　contribute　to　the　building　energy-efficient　design　and　develop　indoor　thermal　and　luminous　environment　research　in　the　future.　©　2020　International　Solar　Energy　Society