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The Air in Nearly Every Big City in the Developing World Is Unhealthy to Breathe
The World Health Organization says air pollution is up 8 percent around the world and, while rich countries are becoming cleaner for the most part, 98 percent of cities in poor nations failed to reach minimum thresholds for healthy air.
This Slum Has the Worst Air Pollution in Mumbai
Half of the city's inhabitants live in slums, where levels of air pollution can be nearly 40 percent higher than in greener, more sparsely populated residential areas.
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