New Delhi, June 30 -- Heavy-duty trucks entering Delhi from other states are responsible for nearly a quarter of transport-related pollution in the Capital despite being allowed inside the city only during restricted hours each day, according to a new study by the Air Pollution Action Group (A-PAG), Indian Institute of Technology (IIT) Delhi and The Energy and Resources Institute (TERI). The study found that around 17,000 interstate freight trucks enter Delhi every day and account for a disproportionately high share of emissions because of their diesel engines, older age profile and intensive operations. Under existing regulations, non-destined heavy goods vehicles are barred from entering Delhi, while trucks carrying goods for the city are...