Which year's cars are referred to as China 4?

[OAnna]

Vehicles produced between 2011 and 2017 comply with the China 4 standard. Below are specific details about China 4: 1. The China 4 emission standard was implemented starting in 2011 and remained in effect until the introduction of the China 5 standard in 2018. 2. The China 4 standard requires approximately 50% lower emissions of various pollutants compared to China 3. Here is additional information: 1. Light-duty vehicles refer to M1, M2, and N1 category vehicles with a maximum gross mass not exceeding 3.5 tons. 2. M1 category vehicles: Vehicles with at least four wheels, or three wheels with a manufacturer's specified maximum gross mass exceeding 1 ton, and seating for no more than 8 passengers in addition to the driver's seat. 3. M2 category vehicles: Vehicles with at least four wheels, or three wheels with a manufacturer's specified maximum gross mass exceeding 1 ton, seating for more than 8 passengers in addition to the driver's seat, and a manufacturer's specified maximum gross mass not exceeding 5 tons. 4. N1 category vehicles: Vehicles with at least four wheels, or three wheels with a manufacturer's specified maximum gross mass exceeding 1 ton, and a manufacturer's specified maximum gross mass not exceeding 3.5 tons, designed for cargo transport.