Authorities must report measures to curb over-age and non-compliant vehicles, enforce PUC norms and regulate interstate traffic. Supreme Court flags rising vehicular emissions in Delhi-NCR and seeks action plans from Delhi, UP, Haryana and RajasthanAuthorities must report measures to curb over-age and non-compliant vehicles, enforce PUC norms and regulate interstate trafficStates have two weeks to submit time-bound plans, with the next hearing scheduled for 23 NovemberThe Supreme Court has expressed serious concern.