Drone shot of Hanoi eco skyline buildings rooftop parks and cityscape blanketed by a thick haze of pollution

aerial hanoi air pollution highrise skyline buildings skyscrapers tower hazy sky city expansion urban landscape urban planning construction urban population residential apartments lakes toxic air vietnamese bustling cityscape populous modern town rural districts red river black river subtropical climate infrastructural development fog mist urban sprawl city grid elevated view greenery metropolis eco parks neighborhoods sprawling vietnam city waterway environment modern skyline housing infrastructure developed zone city skyline financial district transportation travel tourists attraction tourism garden landscape pagodas