The Biofuels Digest website reports that the Calcutta Tramways Company (CTC) has shifted to the use of B20 (20% blend) biodiesel for its fleet of buses. Environmental considerations are seen as the main reason for the shift. According to CTC Managing Director, P. K. Chattopadhyay, January field trials revealed a 35% improvement in smoke value. This means that the B20 biodiesel mixed emitted 35%  less air pollutants compared to conventional petroleum diesel. An agreement for the regular procurement of biodiesel has been signed between the CTC and the Emami Biotech Group, at a price which will save CTC about US $1,000 a month..