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.