Unreal City,
"Unreal City" is a direct reference to Charles Baudelaire which is translated to: "Swarming city, city full of dreams, where the specter accosts the passerby in broad daylight". Initially, I thought this was describing London in a positive sense; however, as it is followed up with Canto III from the Inferno, the "unreal city" of dreams is tainted with suffering. It directly contrasts Dante's "city of woe".
This juxtaposition is explored further in lines 61 - 65. The illusion of the unreal city (in the sense of romanticization) is quickly abandoned with the stark description of "brown fog". Additionally, the difference in "specter accosts the passerby in broad daylight" is apparent, as these lines are in the first person, no third person perspective. This adds to the fact that there is a lack of community, the only thing that is present is the "I", which is further commentary of how suffering can breed an individualistic mindset in the masses.