»mephitic

In between checking references in the Dictionary of Difficult Words, the Hobson-Jobson Dictionary (of words coming into English from Hindi), I came upon mephitic, an adjective meaning "miasmic; poisonous, foul-smelling, having an unpleasant odor"; also "capable of killing by poison"; this word seems most appropriate for the coming All-Hallows Eve, which is a typically boisterous celebration in San Francisco. With the preternaturally warm weather we have enjoyed it may well be a particularly fine night out.