Grist: When pollution drifts by wind into other states, landing in peoples lungs and endangering their lives, it seems sensible to require the state where the pollution originated to put in controls so its industry stops harming its neighbors. Its like a family of smokers in which a child has asthma: The onus is on the adults to limit their smoking so it doesnt reach the crib or the playroom.
But what if the pollution is coming from several different states, and mixing in ways that its difficult...