Study by @HarvardChanSPH links soot levels below @EPA standards to higher death rate: http://www.eenews.net/greenwire/2015/06/04/stories/1060019678 … via @apeterka
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Study by @HarvardChanSPH links soot levels below @EPA standards to higher death rate: http://www.eenews.net/greenwire/2015/06/04/stories/1060019678 … via @apeterka