In recent years the number of causalities that are reported by the noxious gases have increased very rapidly. This has led to major crisis not only on the environment but also on the health of the humans. The core causes of these aftereffects are that the pollution levels are well beyond the safe limits in the environment. In this paper hazardous gas detection and alarming system is proposed which has the ability to detect multiple hazardous gases in the environment under test and also alarm the individuals to take necessary action to avoid exposure to these harmful gases which may put their life under risk. This is suitable in multiple environments such as coal mines, chemical industries, oil and petroleum industries, places where complex welding process is involved and many more. The alarming process used here can be adjusted based on the required threshold PPM which alerts the person in that environment when the gas levels exceed the threshold. This paper also puts forth the different case studies that are carried out in different test environments
