Air pollution in New Delhi hit a five-year high this week, as Diwali fireworks combined with farming fires to shroud the city in a toxic haze. From a report: The annual spike has become something of a tradition in the megalopolis, with some parts of the city this week recording an air-quality index reading of 1,800 — 20 times higher than levels the World Health Organization deems healthy. The news points to the challenge facing Indian authorities as they look to combat…

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