Hydrogen is a colourless, odourless, non-toxic and non-carcinogenic gas at ambient temperature and atmospheric pressure. It is the lightest and most abundant of all the elements. You can find it throughout the universe; in the sun, the stars, and the space between stars and of course on earth.
However, hydrogen gas is not found by itself on earth. It is mostly found in its molecular form combined with another chemical as a compound. An example is water, where it is combined together with oxygen, and methane, combined here with carbon.