... Semiconductor mix gases sensor with 5 year lifeu Gas detection: cigarette smoke, VOCs such as formaldehyde and toluene, ethanol, ammonia, hydrogen ... pollution caused by decoration, paints on new furniture, smoke from cigarette or cooker and life or office scrap has become an ... but also to other air contaminants which are emitted by cigarette smoke, ammonia, hydrogen sulfide etc. It’s also sensitive to ...