As with any industry, there are specific hazards to hog production. Dust is hazardous to the lungs and comes from animal dander, dried saliva, feed components, bedding, and more. Dust masks can help to minimize the hazard. Hazardous gases in hog operations include H2S, ammonia, and carbon dioxide. H2S is particularly dangerous because it inhibits smell and can lead to death. Confined spaces can potentially be dangerous (such as a closed tank, pit, grain bin, etc.). Dangers here include oxygen deficiency/surplus, fire, gases, and liquids. Chemical hazards that may be present include fuels, solvents, drugs, cleaners and sanitizers. Any dangerous chemicals should be listed in the material safety data sheet (MSDS). Zoonotic diseases are always a threat (these diseases can be passed on from animal to man). Herd health and personal hygiene are fairly preventative measures. Earplugs should be worn to prevent hearing damage from loud noises. Of course, working with animals poses the risk of animal handling hazards. Proper handling must be practiced to maintain well-behaved animals.