The Odd/Even scheme will return to the national capital starting from Friday. The phase two of the car rationing scheme will be implemented from April 15 till the April 30. But unlike last time, schools will be open and there is still no clarity on how parents would pick up their children. Environmentalist Anumita Roy said, “Gains made during summer and winter differ a lot. Levels of nitrogen oxide and ozone are likely to go down. If this is done regularly, we need more preparations. The government will have to provide more infrastructure.”