Word order in "either/or" parallel structure


Does it matter where either goes in this either/or sentence, and do I need to repeat from in or from if I've used either from?



Air pollution may come either from the ocean as natural contaminants given off by sea life or from the internal combustion engines of automobiles.


Air pollution may come from either the ocean as natural contaminants given off by sea life or the internal combustion engines of automobiles.





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