The AAS 109 Gaseous Sampling Attachment is designed for simultaneous sampling of four gaseous pollutants present in ambient air. In sampler air is bubbled through specific reagents kept in impingers where gaseous pollutants like SO2, NO2, NH3, and O3 get absorbed. Later collected samples can be analyzed for specific pollutants as per standard wet chemistry methods prescribed by BIS.

AAS 109 is an attachment having inbuilt small pump which run on the controlled power taken from main sampler (PM2.5 Or Combo Sampler) for which this attachment has been designed. Suction of the pump fitted in attachment is connected to manifold of AAS 109 from where it is connected to outlet of the impinger. Suction is controlled though provided four needle valves to set desired air flow rate (upto 3 lpm) for bubbling in impinger reagents (as per standard method requirements).

Cabinet of attachment is powder coated where if some corrosive absorbing reagent spills on it corrosion is not expected. Ice tray is made up of moulded fiber sheet with PUF packed on the walls. Silicon tubing is used for interconnection. Impingers are of standard design as prescribed by BIS.