Which class of hazardous materials is primarily concerned with gases?

Class 2 is associated primarily with gases. This classification encompasses various types of gases, including compressed gases, liquefied gases, and gases that are dissolved under pressure. Key examples include flammable gases, non-flammable gases, and toxic gases. These substances can create significant hazards during emergencies due to their tendency to expand and disperse quickly in the environment, making them a critical consideration for first responders.

Classes 1, 3, and 4 each pertain to different categories of hazardous materials. Class 1 covers explosives, which can present risks related to detonation and shockwaves. Class 3 consists of flammable liquids, which can pose fire and explosion hazards but differ fundamentally from the gaseous state of Class 2. Class 4 pertains to flammable solids and other materials that can ignite and burn readily but do not fall under the gaseous category. Understanding these classifications is crucial for effective hazard assessment and response strategies in HAZMAT operations.