whatever you can imagine. they're so excited to see that blue color. >> it's a beautiful city but you can never see it. >> it is. china was marking the 70th anniversary of japan's surrender in world war ii. they shut down the factories, the coal-burning factories in and around beijing that are often responsible for the thick layer of smog. they also banned half of beijing's 5 million cars from the streets. guess what, it worked. they coined the term of that sky colored blue called parade blue. because it coincided with that military parade that you are seeing on your screen. you know what it looks like when the skies are clear but this is what it looks like when they open up the factories and allow the 2.5 million or so cars to re-enter the highways and biways of china's largest cities. let's take it back a notch. this is what it looked like on