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Spoiler alert: because the wind blows from west to east most of the time. And wind creates pollution in the east side making the east side of the city more poor.
In cartography, a trap street is a fictitious entry in the form of a misrepresented street on a map, often outside the area the map nominally covers, for the purpose of "trapping" potential copyright violators of the map who, if caught, would be unable to explain the inclusion of the "trap street" on their map as innocent. On maps that are not of streets, other "copyright trap" features (such as nonexistent towns, or mountains with the wrong elevations) may be inserted or altered for the same purpose.
The fictional town of Agloe, New York, was invented by map makers, but eventually became identified as a real place by its county administration because a building, the Agloe General Store, was erected at its fictional location. The "town" is featured in the novel Paper Towns by John Green and its film adaptation.