Honda CLARITY Fuel Cell 2020 Owner's Manual page 514

uuIf Hydrogen Gas is LeakinguHow to Handle Leaked Hydrogen Gas
1How to Handle Leaked Hydrogen Gas
WARNING
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This gas is released toward the rear of the
vehicle in a downward direction. Do not
attempt to extinguish the fire from behind
the vehicle as the exiting gas may ignite
into a flame.
NOTICE
Hydrogen gas is colorless, odorless, very light, and
flammable. Also, its burning flame is difficult to
detect by sight.
If a vehicle fire occurs, leaked hydrogen gas may be
ignited. Stay far away from the vehicle call the local
fire department, and report that the vehicle has
hydrogen tanks.
To extinguish a vehicle fire, use a large amount of
water, a dry chemical fire extinguisher (Class A, B, or
C), or a carbon dioxide fire extinguisher. With an
inadequate amounts of water, a fire cannot be put
out completely. Never attempt to extinguish a vehicle
fire with a small amounts of water.
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