Kolkata: The state Transport department has started the process of phasing out buses which are over 15 years old, in a bid to check the pollution level in the city.According to the Transport department officials, as many as 3,000 buses would be taken off the roads in Kolkata gradually. The old buses and other vehicles contribute greatly to the pollution level, which in turn takes a heavy toll on the environment. It may be recalled that there has been a furore over the air quality of the city for the past few months. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseIt has been learnt from the sources that many school buses that have been plying in the city are also under scanner. The school buses that are more than 25 years old have been identified and they will soon be banned, keeping in mind the environmental concerns. It is expected that entry of all the old buses into the city will be restricted within the next two months. The process had begun in January this year. It is assumed that many buses and some trucks have no proper registration. According to sources, around 1.25 lakh commercial vehicles ply in the city every day. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataMany in the city are apprehensive that the phasing out of a huge number of buses would have an impact on the passengers. The Transport department officials have, however, assured that the move would have no adverse effect on the transport system of the state. The state government had also submitted a report to the National Green Tribunal (NGT), detailing the steps it has taken to control vehicular pollution. Vehicular pollution has always been a cause of concern for experts dealing with air pollution, especially in the metros across India. The NGT had earlier observed that tail-pipe emission of vehicles and “re-suspension of road dust” had a direct correlation to the amount of particulate matter in the urban air. Various health experts and doctors in the city said that prolonged exposure to air pollutants can trigger a host of critical ailments, including lung cancer. State Transport minister Suvendu Adhikari said that the process of phasing out the old vehicles has begun in January. “We will restrict the old vehicles that flout traffic norms,” he said.