It depends what the explanation is about, but I’d say a diagram would be the most effective in most cases.
After reading the passage, it my be said that the narrator seems to feel that despite being busy all day, he had the chance to enjoy the place, to breath. maybe it was like an "injection" of energy for him this such fresh air he was able to feel. he is even comparing it to a place with a polluted air which gives him another perspective of the fresh air he was able to find in this place.
Adverb. When dealing with adverbs always ask When, Where, How, How Often? IN describes where the leftovers were placed.
because they all were up to no good .
