High Volume Air Samplers remain workhorse for air quality moniotring. Modification and improvements are done in basic HVS by incorporating a cyclone in the sampler which fractionate ambient air suspended particles into two fractions one upto 10 micron which passes through the cycone and deposited on fitler paper while other bove 10 micron removed by cyclone get accumulated in the cup fitted at bottom of cyclone.

Ecotech developed RDS based on the concept and requirement given in the BIS 5182 (Part-23) 2006. While developing a user friendily provisions are made in the machine for fitting of Gaeous Pollutants Sampling Attachment. Due to provision of fitting of gaseous attachment AAS 217NL has become an unique system using which one can sample simultanously PM10, SO2, NO2, NH3 and O3. Collected PM10 dust can be analyzed for Heavy metals (Ni, As and Pb) and Benzo(a)pyrene without compromizing in single dust sample collected by AAS 217NL as per existing standard methods.