What are cards that certify employees for CNG activities called?

The term "Certification Cards" specifically refers to official documentation that indicates an employee has received proper training and has met the specific requirements to perform certain activities related to Compressed Natural Gas (CNG). These cards serve as proof of competency and knowledge in safety practices, operational procedures, and regulatory compliance associated with CNG activities.

Having a certification card is crucial for ensuring that employees are qualified to perform their roles safely and effectively, and it often signifies that they have completed a recognized training program. This certification is vital in industries involving hazardous materials like CNG, as it helps maintain safety standards and regulatory compliance.

The other options do not accurately capture the nature of the documentation related to CNG training. Employee licenses might refer to broader certifications applicable in various professions but are less specific to the context of CNG activities. Qualification badges could imply a form of recognition but are not standard terminology for official certification in safety and training. Training certificates might demonstrate completion of a course but do not necessarily imply the same recognized certification status as a certification card.