The new emax range has CNG and Petrol bi-fuel system options, it added.
Commenting on the launch, Tata Motors Senior Vice President, Passenger Vehicle Business Unit (Commercial), Ankush Arora said: "CNG is gaining momentum in the Indian automobile market and we are happy to announce expansion of our CNG portfolio."
The introduction of the new variants comes as an essential step that underlines the company's commitment to be a sustainable automotive player, he added.
The two new variants have been introduced in six markets across India and will now be available in Delhi, Maharashtra, Gujarat, Uttar Pradesh, Andhra Pradesh and Tripura, the company said.
Tata Motors had showcased its emax range at the 'Horizonext' event, held in Pune, in June 2013, with a commitment to launch its CNG range in a phased manner in FY 14. The Nano emax was the first in the range.