When did China 4 start?
2 Answers
China 4 emission standards started in 2011 and lasted until 2018 when China 5 standards were implemented. Vehicles produced between 2011 and 2017 all complied with China 4 standards. The China 4 standard required approximately 50% lower emissions of various pollutants compared to China 3. Below is extended information about China 4 emission standards: China 4 emission standards represent the fourth phase of national motor vehicle pollutant emission standards in China. Major automotive emissions include HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). Through technologies such as improved catalytic converter active layers, secondary air injection, and exhaust gas recirculation systems with cooling devices, these standards control and reduce vehicle emissions to below specified limits.
I remember that China's National IV emission standards were implemented starting from July 1, 2011, mainly targeting light-duty vehicles such as private cars. At that time, the government introduced this measure to address urban smog problems, requiring new vehicles to significantly reduce pollutant emissions like nitrogen oxides and particulate matter. Automakers had to upgrade engine and exhaust purification technologies. I think this timeline is important because air quality did improve somewhat afterwards. Later in 2013, the standards were extended to heavy-duty vehicles, making overall emissions regulations stricter. As someone who follows automotive news regularly, I observed that National IV promoted environmental protection across the industry and encouraged more people to purchase clean energy vehicles. Looking back now, it seems quite meaningful.
