Which of the following is listed as an example of an upper tier area?

• A. Flight line
• B. Areas where personnel are aware of the hazard
• C. Hospitals
• D. Visitors or people just passing through known EMF radiation areas

Answer: (A)

Upper tier areas are the zones with the highest potential EMF exposure that require stricter controls and restricted access. The flight line fits this because it surrounds aircraft operations and the associated high-power RF and EMF sources; access is limited to trained personnel and regulated with engineering controls and monitoring to prevent overexposure.

The other options don’t convey that restricted, high-risk designation: areas where personnel are simply aware of the hazard rely on knowledge rather than access controls; hospitals are general-use environments with varying exposure levels and aren’t inherently upper tier; visitors or people just passing through known EMF areas would typically be restricted or escorted, not considered an upper tier designation.