Well in Japan the latest phone models have real gieger counters built in.  Radio active fall out is still bad and even Tokyo high levels of cesuim 137 has been found in the city. Inhale some of that and you die a slow lung cancerious death. Look at China smog levels so bad that now lung cancer is number 1 cause of death there.  Japan is just as bad now but it is radiation not smog unless it comes from mainland China like last week Cough Cough Cough.