The level and group of selected explosion-proof lamps should not be lower than the level and group of explosive mixtures in explosive hazardous environments. At the same time, the impact of the environment on explosion-proof lamps should be considered, and various environmental requirements such as environmental temperature, air humidity, corrosive or polluting substances should be met. The protection level and anti-corrosion level of lighting fixtures should be selected according to different environmental requirements. Especially when corrosive gases exist in explosive gas environments, it is crucial to choose lamps with corresponding anti-corrosion performance. The regional level and scope of explosive gas environment are determined. For example, flameproof lamps must be used within Zone 1, flameproof and increased safety lamps can be used for fixed lamps within Zone 2, and flameproof lamps must be used for mobile lamps