Hydrogen as Fuel in Automobiles

As we all know pollution is increasing day by day in our Daily life. In earlier days we were used to measure, which city is most polluted but unfortunately in now a days we are ranking the city which is least polluted. In New Delhi (Capital of India) during 1971 there were only 2.17 lacks of vehicles using Petrol or Diesel, by 2011 the number of vehicles were increased to 6000 lacks. Since its possible to control the number of vehicles but it will not be suitable. Instead we can use Hydrogen as a fuel in our automobiles by making some engine modifications, thereby reducing the pollution.