North Korea is No. 1 country in the number of dead people by air pollution.

North Korea is No. 1 country in the number of dead people by air pollution because they use trees, coal, and charcoal to cook foods or to keep houses warm in the winter.
The number of dead people in North Korea is 10 times more than that of South Korea.

http://www.voakorea.com/a/3869795.html