noxious
adjective formal uk/ˈnɒk.ʃəs/ us/ˈnɑːk.ʃəs/
（尤指气体或其他物质）有毒的，有害的
Something, especially a gas or other substance, that is noxious is poisonous or very harmful.
They died from inhaling noxious fumes. 他们吸入有毒烟雾致死。
有害的；令人不愉快的；讨厌的
harmful and unpleasant
a noxious smell/influence 难闻的气味／不良的影响