3 highlights
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As the towns and cities expanded, the residential areas for the workers tended to be in the east, with the middle and upper-classes in the west.
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much of the northern hemisphere, the prevailing winds are westerlies – blowing from west to east. The massive, unchecked pollution from these early industries would therefore drift eastward, making the air quality much lower in the east end of cities, lowering the desirability (and price) of the housing.
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London, as an example, displays a massive east/west divide, caused in large part by both early industry and the west-to-east flow of the River Thames.