Green hydrogen is safer than conventional fuels
To evaluate hydrogen’s safety, it must be compared to that of other conventional fuels like gasoline, propane, and diesel. While no fuel is 100 percent safe, green hydrogen has been shown to be safer than conventional fuels

in a multitude of aspects.

Hydrogen is not toxic, unlike conventional fuels. On the other hand, many conventional fuels are toxic or contain toxic substances, including powerful carcinogens. Moreover, when it comes to vehicles that run on hydrogen fuel cells, hydrogen produces

only water, while vehicle combustion of conventional fuels generates harmful air pollution. A hydrogen leak or spill will not contaminate the environment or threaten the health of humans or wildlife, but fossil fuels can pose significant health and ecological threats when leaked

, spilled, or combusted.
Hydrogen is 14 times lighter than air and 57 times lighter than gasoline vapor. This means that when released, hydrogen will typically rise and disperse rapidly, greatly reducing the risk of ignition at ground level. However, propane and gasoline vapor

are heavier than air, making it more likely that they will remain at ground level, increasing the risk of fires harming people and buildings.
Hydrogen has a lower radiant heat than conventional gasoline, meaning the air around the flame of hydrogen is not as hot as around

a gasoline flame. Therefore, the risk of hydrogen secondary fires is lower.
Hydrogen has a higher oxygen requirement for explosion than fossil fuels. Hydrogen can be explosive with oxygen concentrations between 18 and 59 percent while gasoline can be explosive at oxygen

concentrations between 1 and 3 percent. This means that gasoline has greater risk for explosion than hydrogen for any given environment with oxygen. https://www.nrdc.org/experts/christian-tae/hydrogen-safety-lets-clear-air