The most recent hybrid buses started operating from Gulshan-e-Hadeed to the Malir Cantt area in Karachi on Wednesday.
The buses were imported from China as part of the people Bus Service programme launched by the Sindh government to support the public.
Meanwhile, Sindh Chief Minister Syed Murad Ali Shah, chairing a meeting in Karachi, instructed officials to ensure the smooth operation of buses at all eleven routes of the People Bus Service.