I'm looking for radiation exposure info for Southern California.  The gov't websites and newspapers all mimic one another and report that "levels detected are far below levels of concern". I am extremely concerned because I live near Anaheim, a city where levels were found to be elevated.  Can anyone answer what IS a level of concern vs. BELOW a level of concern?  I'm just very confused and worried about this increasingly horrible situation happening in Japan and how it's effecting the U.S. Can anyone shed some light on this and guide me in the right info direction??