Where It All Goes Down
The setting for this poem is the big wide world of nature. If we're outside, or at least sitting by an open window (which is probably more likely in Dickinson's case considering what we know about her), then we're in the same place as the speaker for this poem. That may sound a little too big and general, but that was Dickinson's point—nature is all around us, and if we'd only stop to literally smell the roses once in a while then we could experience the same kind of joy that she is experiencing. She wants us to go outside and just, well, breathe. (It's probably safe to say that Dickinson didn't suffer much from allergies.)