What was the emission standard for cars in 2013?

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Vehicles manufactured after July 1, 2013 were generally compliant with China IV emission standards, as this was the deadline for China III vehicle registration. Nineteen regions including Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, Urumqi, and Lanzhou strictly implemented the China IV standard from July 1, 2013. The nationwide implementation of China IV emission standards began on January 1, 2014. Below are methods to check a vehicle's emission standard: 1. The simplest method is to check the environmental protection label on the vehicle, which clearly indicates the standard on the back; 2. Visit the website of the Motor Vehicle Exhaust Pollution Supervision and Management Center to inquire; 3. Bring the vehicle registration certificate (original or copy) to the local vehicle management office for inquiry; 4. For new vehicles, the emission standard can be found on the vehicle's factory certificate. However, this certificate is usually kept by the vehicle management office, so it's advisable to make a copy when purchasing a new vehicle for future reference; 5. Roughly estimate based on the vehicle's registration year: most vehicles registered after 2015 are China V compliant; those registered after 2008 are mostly China IV; vehicles registered in 2007 could be either China III or China IV; vehicles registered before 2007 are generally below China IV, meaning China II or China III; and vehicles registered before 2005 are mostly China II compliant.