Hanoi authorities say  more than two thirds of the poisonous smog that blankets Vietnam's capital is caused by petrol vehicles, and officials have ordered that a quarter of two-wheelers across the country must be electric by 2030

Hanoi authorities say more than two thirds of the poisonous smog that blankets Vietnam's capital is caused by petrol vehicles, and officials have ordered that a quarter of two-wheelers across the country must be electric by 2030