A review of emission standards of some Asian countries

The overall air quality has deteriorated in Vietnam over the last several decades, particularly in metropolitan regions. Vehicle emissions significantly contribute to the decline in air quality in these places. This article aims to evaluate the automobile emission requirements of Asia countries and compare them to Vietnam's emission regulations. Nevertheless, there are many disparities in the current emission limits implemented by various nations. For example, the emission rules in Korea are not biased towards any certain kind of fuel, and there is no distinct classification based on weight for light-duty vehicles (LDVs). Vietnam, Thailand, and Korea have distinct weight classifications and emission limitations for both petrol and diesel cars. Therefore, it is essential to do a more comprehensive study on the development of universally applicable emission standards that may be implemented globally. This will ensure consistency in the information and policies accessible to the general public.