Non-ferrous metal foundry products are non-ferrous castings of photochemical smog and ozone that are blue, metal or metalloid poisons. Common metal and metalloid poisons include lead, mercury, manganese, nickel, antimony, arsenic, phosphorus and their compounds. Irritating gas. It refers to gases that are irritating to the eyes and respiratory mucosa, and are toxic gases that are often encountered in the chemical industry. There are many kinds of irritating gases, the most common are chlorine, ammonia, nitrogen oxides, phosgene, hydrogen fluoride, sulfur dioxide, sulfur trioxide and dimethyl sulfate. Asphyxiating gas. Refers to toxic gases that can cause oxygen deficiency in the body. Asphyxiating gases can be classified into simple asphyxiating gases, blood asphyxiating gases, and cell asphyxiating gases. Such as nitrogen, methane, ethane, ethylene, carbon monoxide, nitrobenzene vapor, hydrogen cyanide, hydrogen sulfide and so on.