Delhi Chief Minister Arvind Kejriwal on Wednesday said he felt 'sad' that the metrol rail has become unaffordable for the common man following the fare hikes."As CM of Delhi, I feel very sad that such an important means of transport has become out of reach of common man. All those who have given up metro are now contributing to Delhi's pollution by using road-based transport," he said in a tweet.The Delhi Metro, according to a report by the Centre for Science and Environment, is the second-most unaffordable in the world among the metro systems after Hanoi in Vietnam.The Metro lost over 40 per cent of its ridership following two fare hikes in 2017.The metro currently has a daily ridership of about 26 lakh, while a 2016 study had projected that the train services would be used by about 40 lakh people in 2018.