"To a poor old Woman" is a poem written by William Carlos Williams. Williams often said that poetry should be "rooted in the locality which should give it fruit" meaning that poems could be created by the inspiration of the events that occur in everyday life.
The phrase "seeming to fill the air" gives the reader the impression that the woman in the poem is in a distinctively comforted mood, as she enjoys the taste of the ripe plum that she has taken from the tree which is above her.
