The main reason to substantiate this may be because of their safer physical properties and they are built to stringent standards.
Natural gas has a limited range of flammability that means it burns at a particular range of temperatures with a fixed mixture of fuel-air. Hence there is lower tendency almost nil, that that may be any chances of higher temperatures while combustion.
Natural gas is non-toxic or we can say it has almost nil toxicity. It has lower tendency to contaminate air and water.
Natural gas has a distinct odor, though non toxic. Hence there is lesser possibility of dangers due to suffocation in case of any leakages.
Carbon emissions are very less when compared to other basic fuels. Hence it is not only environmental friendly, but also reduces green house effect.
It is comparatively cheaper and available in plenty.
Natural gas requires very less processing from its crude form to its refined state.
Most important thing to note about natural gas is that it should be highly compressed with great pressures. But they are designed for safety both in case of normal usage as well as in case there are any crashes. They also have a standard safety equipment.
