chemicals workers exposed natural disaster class wikitable '''chemical''' '''tlv twa mg sup sup ''' '''pel mg sup sup ''' '''idlh mg sup sup ''' '''magnesium''' '''phosphorus''' established '''ammonia''' '''silica r ''' '''chlorine dioxide''' '''asbestos''' fibers fibers established '''direct release''' magnesium phosphorus ammonia silica '''intentional release''' insecticides chlorine dioxide '''unintentional release''' crude oil components benzene n hexane hydrogen sulfide cumene ethylbenzene naphthalene toluene xylenes pcbs agrochemicals asbestos biological exposures '''mold exposures''' exposure mold commonly seen natural disaster
Applied science Public administration Emergency management