Inhaling 1147 mg/m3 of benzotrichloride (BTC) for 3 hours resulted in 1 out of 6 male rats dying (after 3 days). On the other hand, inhaling 995 mg/m3 of BTC for 3 hours resulted in 4 out of 6 female rats dying within 13 days. However, reducing the duration of exposure to only one hour with a concentration just above 800 mg/m3 resulted in no male or female rats dying. The treated rats had irritated oral and ocular mucous membranes, while behaviour and breathing were altered for up to 13 days.