... 2S), ammonia, carbon dioxide, methane, and carbon monoxide are the most pervasive (Donham et al., 1982a; Donham and Gustafson, 1982; Donham et al., 1982b; Donham and Popendorf, 1985; Donham ... decomposition of animal urine and feces (ammonia, hydrogen sulfide, and methane, among others) (Donham and Gustafson, 1982; Donham and Popendorf, 1985; Donham et al., 1995). The combination of ... frequent and severe among smokers (Donham and Gustafson, 1982; Markowitz et al., 1985; Marmion et al., 1990) and among workers in large swine operations (who work longer hours inside ifap...