I would recommend you look at Baltic engineered wood floors. They are both FSC certified for sustainably harvested wood and Green Guard certified for low emissions from offgassing.
In any case, look for Green Guard certified products. Their website also has a listing of products I believe.
For more information:
Read "Are there any hardwood (not bamboo) engineered click floors that have no/low VOC's similar to the bamboo by Teregan or EcoTimber?" a Q&A answered by Cynthia Phakos.