Explosion at 1:22 into the video.
Go inside and cover your mouth?
"An explosion rocked one of nuclear power plants, causing a portion of a building to crumble, sending white smoke billowing into the air and prompting Japanese officials to warn those in the vicinity to cover their mouths and stay indoors."
http://www.washingtonpost.com/wp-dyn/content/article/2011/03/11/AR2011031103673.html?hpid=topnews
Fatboy sez: What. Me Worry?