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poor air quality is not unique to the uk or europe. more than 90% of people around the world breathe dangerous levels of air pollution, according to the . . . xml:space="preserve"> .it's not clear how well they'll stack up against current migraine therapies, because head-to-head studies haven't been done. .
it's not clear how well they'll stack up against current migraine therapies, because head-to-head studies haven't been done. .