Chemical warfare agents are deadly toxic and their even one gram quantity can kill around hundreds of soldiers. Such chemicals are potential threats, for civil population, if used by terrorists, as these toxic agents are colorless, odorless, highly vaporizable, and can be dispersed easily in air. For protection, detection of such chemical vapours at extremely low concentration (Sub PPM Level) is necessary. DRDE, Gwalior is a pioneer DRDO Lab, doing R & D for chemical detection  and protection, against chemical warfare Agents, and has developed a large number of technologies, for detection as well as 1 protection from CWA threats. Quartz Micromass Balance (QMB) works on the principle of piezo electric effect. A differential quartz crystal oscillator made from Quartz crystal, coated with chemically active interface, provides a reversible, and rapid detection signal for sub PPM level concentration of toxic chemical agent Sarin and its simulant DMMP. Quartz Micromass Balance sensors are quite sensitive and rapid. The science associated with such a sensor , its functional and design aspect and representative practical results are being described. DRDE, Gwalior has developed a large number of technologies for NBC protection of the armed forces from a NBC (Nuclear, Biological and Chemical) attack. For protection, Face mask Canisters, based on active charcoal filtering have been made, which can absorb toxic chemicals, biological bacteria, & spores, radioactive dust particles etc and provide breathable air in a toxic chemical environment. Such filtering canisters and high volume filers are in use of Indian forces for civil preparedness.

Key words : Quartz Micromass Balance,PPMlevel, Piezo electric effect