Did you know Tokyo Haneda Airport was ranked the cleanest airport in the world?
Here are the top 10 cleanest airports.
The World's Cleanest Airports
1 Tokyo Haneda
2 Centrair Nagoya
3 Incheon
4 Taiwan Taoyuan
5 Singapore Changi
6 Tokyo Narita
7 Hong Kong
8 Zurich
9 Doha Hamad
10 Helsinki
http://www.worldairportawards.com/Awards/worlds_cleanest_airports.html
Nothing in America.