Such gases are common in working environments in industries such as petrochemical and chemical manufacturing. Our common combustible gases include hydrogen (H2), methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), ethylene (C2H4), propylene (C3H6), butene (C4H8), acetylene (C2H2), acetylene (C3H4), butyne (C4H6), and so on.

Toxic gases refer to gases that are harmful to the human body and can cause poisoning. They are mainly divided into irritating gases (referring to gases that stimulate the eyes and respiratory mucosa) and suffocating gases (referring to toxic gases that can cause hypoxia in the body. Asphyxiating gases can be divided into pure suffocating gases, blood suffocating gases, and cell suffocating gases). These gases can directly cause harm to the human body and are also very dangerous, Common toxic gases include carbon monoxide (CO), hydrogen sulfide (H2S), ammonia (NH3), chlorine (CL2), sulfur dioxide (SO2), nitrogen dioxide (NO2), nitric oxide (NO), carbon dioxide (CO2), and so on.