The wide-based National Stock index Nifty crossed 4,800-points level for the first time in almost 15 months, while the BSE benchmark Sensex surged by over 122 points in opening trade on Tuesday on increased inflow of foreign funds driven by firming trends in other Asian markets.

The broader-based National Stock Exchange index, Nifty, rose by 38.40 points to 4,821.30 points- a level last seen on June 2, 2008.