I want to know the answer to the following question:
New Delhi's alternate-day travel scheme allowed trucks to enter the city after what hour?
All the background I'm provided with is that "In an attempt to curb air pollution in New Delhi, which gets worst during the winter, a temporary alternate-day travel scheme for cars using the odd- and even-numbered license plates system was announced by Delhi government in December 2015.". Is that enough to answer the question?