Cesium 137 is an artificial element. Comparing current levels stemming from Fukushima to nearly entirely-decayed levels left over from bomb testing is obviously going to give you a very large scary-sounding number. The real question is what does 1.6, or 160, or even 1,600 Bq/m3 really mean in the real world?
The EPA believes that 7,410 Bq/m3 is the safe limit in drinking water, and presumably they've done the math far more than twice.
Care to explain/revise that statement? (talk about scary numbers)