Beijing may have been just about the best possible place to unveil a major deal on emissions because as Jon Stewart pointed out on Tuesday night’s “Daily Show,” the city really needs it.

The air quality is so bad that Beijing had to shut down factories and schools to help reduce smog ahead of the APEC summit. And these efforts worked, leading residents to dub the rare clear skies “APEC blue.”

“Well at least residents didn’t flee in fear of the enormous, ‘SKY FIREBALL!'” Stewart joked, referring to the rare glimpse of sunlight.

That wasn’t the only APEC oddity. From “Hunger Games” cosplay to world leaders acting more like “Mean Girls,” Stewart took a look at the summit’s strangest moments.

Check it out in the clip above.