 Ammonia engines were used experimentally in the 19th century by Goldsworthy Gurney in the UK and in streetcars in New Orleans.In 1981 a Canadian company converted a 1981 Chevrolet Impala to operate using ammonia as fuel.Ammonia and GreenNH3 is being used with success by developers in Canada, since it can run in spark ignited or diesel engines with minor modifications, also the only green fuel to power jet engines, and despite its toxicity is reckoned to be no more dangerous than petrol or LPG.