A new map about radiation dangers to North America

The prior map that was circulating online might well be a hoax, but the following one is from the Daily Mail paper in the UK.  While the story it is including in seems perhaps a bit alarmist, I can't think of anything good about two reactors experiencing explosions so maybe there is indeed much more to what is happening than the media or "experts" will predict:

From: http://i.dailymail.co.uk/i/pix/2011/03/14/article-1365781-0B2B79A700000578-902_634x410_popup.jpg