Gasoline is very dangerous. It can explode when an electric spark lights it. It is also harmful if a human drinks it or if it gets on the skin. It hurts the environment and human health by creating poisonous gases such as carbon monoxide. If a gasoline engine is used indoors or in a closed space, the carbon monoxide can cause death in minutes. Many people die every year from using gasoline-powered generators indoors, or leaving vehicles running inside a garage. 