Various associations of private transport operators in West Bengal are girding up their loins to battle the State Government's decision to implement the Euro I and II emission norms to curb automobile pollution in the state over the next two years. The powerful Bengal Bus Syndicate and the Bengal Taxi Association, which together control almost all commuter buses and taxis in the state, have declared a war against the Government decision to make it mandatory for new vehicles hitting Calcutta streets from July, to conform to Euro I standards.