Authorities restricted many private vehicles from taking to the roads of India’s capital on Monday amid a public health crisis that has left New Delhi residents gasping and their eyes burning from toxic air pollution. The “odd-even” scheme will restrict private vehicles with odd-number license plates to driving on odd dates while even-numbered plates are allowed on even-numbered dates. The state-run Central Pollution Control Board’s air quality index for New Delhi was “severe” at 436, about nine times the recommended maximum.