When was China IV diesel implemented?

[Guy]

Diesel vehicles are divided into light-duty diesel vehicles and heavy-duty diesel vehicles, with different implementation times for each type. The specific times are as follows: 1. Light-duty diesel vehicles: On July 1, 2013, the China IV emission standard was implemented nationwide. 2. Heavy-duty diesel vehicles: On January 1, 2012, the China IV emission standard was implemented nationwide. Additional information is as follows: 1. Light-duty vehicles refer to those under 3.5 tons, while medium-duty vehicles refer to those over 3.5 tons. Private cars, which are light-duty gasoline vehicles, have been subject to the China IV emission standard nationwide since July 1, 2011. 2. The China IV standard, officially known as the National Phase IV Motor Vehicle Pollutant Emission Standard, was in effect until June 13, 2019, when China implemented the China V emission standard. The reason for frequent updates to emission standards is that as the number of vehicles increases, the environmental pollution caused by vehicle exhaust has become increasingly severe. 3. The main pollutants from vehicle emissions include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). The national emission standards are primarily based on the European Union standards, with some adaptive modifications made to suit local conditions.

[Dawson]

I remember the implementation timeline of China's National IV diesel emission standards very clearly. As a seasoned driver, I always pay close attention to such policies in my daily driving. For heavy-duty diesel vehicles, new models had to comply with National IV standards starting from July 2013, while light-duty vehicles weren't fully required to meet the standards until January 2015. Back when I drove a National III diesel vehicle, black exhaust smoke was a common sight, which significantly impacted health. After National IV, new vehicles became much cleaner in emissions and maintenance costs stabilized. However, National III vehicles could still operate for some time, and many people like me waited until the new standards became mandatory before upgrading. These standards were later surpassed by National V and VI, but they played a significant role in reducing air pollution, including PM2.5, making cities feel a bit less dusty.