Yes, there should be a concern of offgassing urea-formaldehyde as well as offgassing volatile organic compounds (VOCs) from the finishes used in the manufacturing of wood floors.
Armstrong's website has the material safety data sheets (MSDS) for each of their products which you can download and review.
These MSDS reports will list all hazardous chemical compounds used in the manufacturing of the product as well as health risks associated with them.
For more information:
Check GreenHomeGuide's green flooring Know How section for buyer's guides, backgrounders, etc.