CNN - A thick, toxic smog has enveloped northern India and eastern Pakistan just days before the start of Diwali, a festival typically celebrated with fireworks that each year sends air quality plummeting. The air quality index in India’s capital Delhi earlier today was roughly 250, after days in the “very unhealthy” zone above 200, according to IQAir, which tracks global air quality. In the Pakistani city of Lahore, roughly 15 miles from the Indian border, air quality today surpassed a “hazardous” 500 — almost 65 times the World Health Organization’s guidelines for healthy air — making it the most polluted city in the world, according to IQAir. Diwali, the Hindu festival of lights, is set to begin Thursday. During the five-day celebration, people gather with their families, feast and set off firecrackers, further exacerbating air pollution.
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