Byrnihat looks like many other towns in India’s picturesque northeastern states of Assam and Meghalaya. But while it is nestled among lush green hills and scenic river valleys, it holds the unwanted title of the world’s most polluted city,…

Byrnihat looks like many other towns in India’s picturesque northeastern states of Assam and Meghalaya. But while it is nestled among lush green hills and scenic river valleys, it holds the unwanted title of the world’s most polluted city,…