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Compared to cities on flat open plains, cities surrounded by or next to high mountains face additional challenges in managing air quality. The mountains influence ventilation by blocking or channeling air flow.
The Hindu Kush Himalaya (HKH) sources of 10 major river systems in Asia that provide water, ecosystem services, and livelihoods to more than 210 million people. The region holds and distributes water for more than 1.3 billion people—a fifth of the