I think it's sewer gas. A kind of food processing :-)

On high pressure days, the outside air flows into the relatively low 
pressure of the sewers, and you smell nothing. 
On low pressure days, the relatively high air pressure inside the 
sewers must now equalize, so it blows out....usually in a low/easiest 
access point. 

I'm not sure about all manholes, but many low sewers (especially 
around the river) stink when there is a sudden drop in air pressure 
from a weather front.

Tom Holtzleiter
Kingfield



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