EMANATING FROM smokestacks, vehicle engines, construction projects, and fires large and small, airborne pollution – sometimes smaller than the width of a human hair, and very often the product of human activity – is not just contributing to climate change. It is a leading driver of heart disease and stroke, lung cancer, and respiratory infections the world over. Exposure to such pollution, the most deadly of which scientists call PM2.5, is the sixth highest risk factor for death around the world, claiming more than 4 million lives annually, according to recent global morbidity data. Add in household pollutants from indoor cooking fires and other combustion sources, and the tally approaches 7 million lives lost each year.
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