NIOSH recommended standards for occupational exposure to ammonia and benzene.
D000641:Ammonia; D001554:Benzene / Q000633:toxicity; D002274:Carcinogens, Environmental; D004781:Environmental Exposure; D004782:Environmental Health / Q000592:standards*; D006801:Humans; D007221:Industry; D008452:Maximum Allowable Concentration
D002274:Carcinogens, Environmental; D000641:Ammonia; D001554:Benzene