Sentence:  Despite having been awake now for more than twenty-four hours – and the comforts of gaol had not been so great that I'd slept quietly there, to say nothing of my troubling dreams – I was curiously refreshed. The brisk air blew away the fogs and <WSD>fusts</WSD> of London. 
Meaning of the word marked with <WSD> tags:  A strong musty smell; mustiness.