Official: China's vehicle pollution picture grim

China is facing a grim situation when it comes to controlling pollution from motor vehicles, said Ding Yan, deputy director of the Ministry of Ecology and Environment's vehicle emission control center, citing problems from manufacturing to fraudulent testing.

He called for improvements in environmental enforcement in a written statement on Thursday in response to questions from China Daily.

Motor vehicles are a major air polluter whose numbers are increasing sharply. Consequently, better enforcement is needed to help achieve goals set in a three-year air pollution action plan, Ding said.