Efforts to curb pollution in India's sprawling capital region have sent some residents scurrying to an unlikely source: their mathematics text books.
That's because beginning January 1, the government of the national capital territory of Delhi (run by a different party to the ruling BJP at the center) proposes that cars be allowed to run on alternate days, depending on whether the last digit on the number plate is even or odd.
The numbers-based approach is part of a slew of measures announced by the territory's government to curb pollution; the government also plans to shutter some power plants and vacuum streets.
Internationally, there are a number of ploys used by governments to limit the number of cars on the roads. In Singapore, for instance, wannabe drivers must purchase a certificate of entitlement (COE) in order to own a vehicle and use road space for 10 years.