Shares of M&M slumped today ahead of court decision on banning diesel cars in Delhi.
Mahindra and Mahindra fell 5.9 per cent and was the top loser on NSE index.
The stocks heads towards its biggest single-day percentage loss since August 24.
The Supreme Court will decide today whether to ban registering diesel SUVs and luxury cars with an engine capacity of over 2,000 CC in Delhi to curb air pollution
Investors feel that the impact on M&M will be significant as most of its models do not have a non-diesel variant.
Temporary ban on Delhi diesel vehicle has left the automakers in dark and investors jittery.
The M&M stock has lost 10.6 per cent in December.