In most cases, yes, there is formaldehyde in laminate flooring.
I have found no additional evidence in the case of Armstrong flooring; they do not make claims as to whether or not their products contain formaldehyde. In our experience, all manufacturers -- except for a few -- use adhesives that contain formaldehyde.
What is it about the laminate you are most attracted to? We might be able to find you a safer, healthier option.
For more information:
Read "Can you recommend affordable green kitchen cabinets, flooring, and countertops?" a Q&A answered by Cynthia Phakos.