There are two types of environment most likely to be relevant when choosing the torches and lamps for your specific needs; dust and gas. Both explosive gas environments and explosive dust environments are referred to as Gas Zones, or hazardous area zones in typical circumstances where the danger of combustion may occur.
Potential Gas Explosive Environment
Potentially explosive gas atmospheres include sites such as petrol stations, petrol station forecourt, the fuel storage tank and the area where the decanting of flammable liquid from the container to Gas Zones are Zone 0, Zone 1 or Zone 2.
Potential Dust Explosive Environment
Potentially explosive dust atmospheres include areas where the decanting of combustible material from the container to containers such as storage tank and tanker. (combustible material in dry form) for gas atmospheres and for dust, the Zones are Zone 20, Zone 21 and Zone 22.