Get leaded interior paint banned in the US in 1909

France and Belgium banned leaded interior paint in 1909, but the US allowed it until 1978. What PODs could get the US to ban leaded paint in 1909?

Keep in mind that leaded gasoline wasn't invented until 1926.
 
Something on the same scale as the scandals and journalism that caused the meat industry to clean up a bit, or the steam power industry to substantially raise its standards in the 19th Century.
 
An earlier, even more brutal WWI with the U.S. involved in from day 1 leads to nationalization of the lead industry for war production. We can't waste it on house paint! Even after the armistice, we keep stockpiling it for future munitions use.
 
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