Vathi instruments pm10 and pm2.5 monitor vdpm 6000 for aaqms purpose, real time portable beta attenuation mass monitor, continuously measures the mass concentration of ambient particulate matter(pm10 & pm2.5) collected onto glass filter tape with time resolu-tion of one-minute. The pm10 and pm2.5 monitor vdpm-6000 employs an in-line sampling geometry in which the attenuation of beta rays across filter media is measured and particulate matter is sampled simultaneously.