A monster made out of nanites. It was created to eat garbage during a sanitation worker strike.
P.E.M.C. is clearly a homage to Hedorah since both grow by consuming pollution even though Hedorah absorbs mostly air pollution not garbage. It also is probably a homage to the Blob and maybe Carnage from "Spiderman". Oddly enough the parasites from the movie "Cloverfield" highly resemble the P.E.M.C. 's nanites.