When transporting chlorine, what is essential to have in addition to shipping papers?

Answer: B — An approved gas mask

When transporting chlorine, having an approved gas mask is essential because chlorine is a highly toxic and corrosive gas. In the event of a leak or accident, exposure to chlorine can lead to serious health hazards, including respiratory issues or chemical burns. An approved gas mask is designed to filter out harmful substances and protect the airway, allowing the driver or handlers to deal with emergencies safely. While other options such as personal protective equipment or a fire suppression device may also be necessary for safety when handling hazardous materials, the specific requirement for a gas mask highlights the immediate need for respiratory protection in case of chlorine exposure. Thus, having an approved gas mask aligns with the necessity to safeguard against the specific dangers associated with chlorine, reflecting a crucial aspect of HAZMAT regulations and emergency preparedness.