百級無塵車間0.5微米的最大容許粒子濃度小於3520（pc/m3)
，5微米的最大容許粒子濃度小於293(pc/m3)。

無塵淨化級別主要是根據每立方米空氣中粒子直徑大於劃分標準的粒子數量來規定。也就是說所謂無塵並非100%meiyouyidianhuichen，ershikongzhizaiyigefeichangweiliangdedanweishang。dangranzhegebiaozhunzhongfuhehuichenbiaozhundekelixiangduiyuwomenchangjiandehuichenyijingshixiaodeweihuqiwei，danshiduiyuguangxuegouzaoeryan
，napashiyidiandiandehuichendouhuichanshengfeichangdadefumianyingxiang，suoyizaiguangxuegouzaochanpindeshengchanshang，wuchenshibirandeyaoqiu。