Which of the following regulations is recognized by ICAO as the field document?

The Dangerous Goods Regulations (DGR) are recognized by the International Civil Aviation Organization (ICAO) as the field document specifically tailored for the air transportation of dangerous goods. The DGR provides guidelines and standards that aim to ensure the safety of air transport operations by regulating the handling, packaging, and labeling of dangerous goods. This regulation is critical for aviation safety, as it encompasses all aspects of transporting hazardous materials by air, including proper documentation, training, and emergency procedures.

The other regulations mentioned serve different contexts within the transportation of dangerous goods but are not specific to air travel. The ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road) pertains to road transport, the IMDG (International Maritime Dangerous Goods) Code is focused on maritime transport, and RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations) relates to workplace health and safety reporting in the UK, not transportation. Therefore, the DGR stands out as the applicable regulation recognized by ICAO for aviation purposes.