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The third type of smart cameras works on the sense of smell to find out what kind of volatile substance is in the atmosphere. The cameras have been trained to differentiate between the smells of different liquids and gases. Research in this field is very advanced, and there are advanced and modern cameras, but they are surrounded by high secrecy, due to their use in chemical plants and nuclear facilities. These cameras may exist in the markets, but they are not high-tech. These cameras can be used in industrial facilities that produce gases, toxic or flammable elements.