That was the year she traveled to Hanoi, the capital of communist North Vietnam (America's enemy) to tour villages, cities and infrastructure. It was also the year a series of photos of her ...

as well as emissions from the huge number of motorbikes and cars that crisscross the capital every day. Carbon emissions from coal plants to the north and agricultural burning exacerbate the problem.

Vietnam's capital Hanoi has been covered in thick smog over recent weeks, putting it at the top of a list of the world's most polluted cities, as the government said it would push for more ...

Example Bombing President Johnson ordered the bombing of strategic military targets in North Vietnam, including air raids on the capital city, Hanoi, and bases and supply routes for the Vietcong.