Vapors are heavier than air, collecting in low, confined areas. Public Safety
Stay upwind, eliminate ignition sources, and consider an initial 800-meter (1/2 mile) downwind evacuation. Emergency Response
Eliminate ignition sources and use water spray to reduce vapors.
Do not extinguish unless the leak can be stopped; use unmanned hoses for tank fires.
Based on the Emergency Response Guidebook (ERG), covers Gases—Flammable (Including Refrigerated Liquids) . It is used for handling incidents involving dangerous goods that are easily ignited by heat, sparks, or flames. Potential Hazards
Move victim to fresh air, treat for frostbite, and cool burns with water.
Isolate the area for at least 100 meters (330 feet) in all directions.
Or did you mean a (like 1049 for Hydrogen) that leads to Guide 115? Response Guide 115 - ERG 2020 - CAMEO Chemicals