What is a common requirement for hazardous materials transported by air?

Hazardous materials transported by air indeed require specialized handling and documentation to ensure safety and compliance with regulations. This requirement is in place to manage the risks associated with the potential dangers posed by these materials, which can include flammability, toxicity, corrosiveness, and other hazardous properties.

Transporting hazardous materials involves strict adherence to guidelines set by regulatory bodies like the International Air Transport Association (IATA) and local aviation authorities. These guidelines dictate how such materials are classified, packaged, labeled, and documented. Proper documentation includes the use of specific forms that identify the material, outline emergency response procedures, and ensure that anyone involved in the transportation process is aware of the risks.

The other options do not accurately reflect the requirements surrounding the air transport of hazardous materials. For example, while a pilot plays a crucial role in the operation of the flight, it is not solely their responsibility to declare hazardous materials. Furthermore, hazardous materials can indeed be transported by air, provided all regulations and safety measures are strictly followed. The requirement to transport at low altitudes does not align with standard aviation practices and is not a condition imposed on the transport of hazardous materials.