Yes, you are right. It is so small a quantity, the actual threat on human health is really questionable. I believe this is the reason why the Pb-free issue faded away gradually several years ago in USA. Too many people didn't believe it is important back then.
The recent renewed interest on Pb-free in North America is primarily driven by business interest, not directly by environmental concern. North America learned recently that Japan and Europe are serious about Pb-free, and realizes that both regions may develop a business edge over North America by using Pb-free approach.
The driver for Pb-free in Japan and Europe is believed to be a combination of environmental concern and business consideration.
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