It is of great importance to detect, monitor and control hazardous gases in manufacturing environments that are toxic, flammable, explosive or cause adverse changes in oxygen levels. In order for manufacturing processes to continue in a quality, efficient and environmentally friendly manner, they must be monitored at every stage. In particular, mechanical operations such as cutting, drilling and welding can create reactions at any time and cause irreversible losses depending on the quality and quantity of gases present in the environment. In order for the manufacturing process and the environment not to be negatively affected and for the workflow not to be interrupted, certain procedures must be implemented before and during manufacturing. In this study, the environments where gas measurements should be performed and what needs to be done to prevent negative situations such as work accidents, poisoning and explosions are explained. In this way, the systems can be operated efficiently and safely, without causing any environmental problems and at low cost.