Why is there a 地 in (霉)旧地席的气味?
「地」 is not a particle here. The word for rag mats is translated as the two-character word 「地席」, literally mat (席) for the floor (地).


  ...舊地席的气味
  
  ...smelt (气味) of (的) ... old (舊) rag mats (地席).