A common aerosol sampling inlet system (ASIS) is designed and developed at IIST to sample the ambient aerosols to characterize their physical, optical, and chemical properties (Figure 7). The developed inlet system can provide humidity-controlled aerosol flow at rates up to 38.4 liter/minute at a particle size-cut of 10 µm. The custom-designed diffusion dryer in the ASIS effectively reduces relative humidity (RH) by 34-40% on an average at a flow rate of 10 liter/minute, even under extreme RH conditions (RH>90%). Detailed characterization of the ASIS for its particle transmission efficiency is underway. The modular design of the common ASIS enables customization, easy cleaning and maintenance, and system scalability according to various sampling needs (under patent filing, Sam P. Raj & P. R. Sinha)