What is the emission standard for 2009 cars?

[OAutumn]

2009 cars are either China III or China IV emission standard. Cars produced between July 2007 and September 2009 comply with China III standard, while those manufactured after September 2009 generally meet China IV standard. Here is relevant information: 1. Vehicle emission standards: These refer to regulations limiting harmful gases emitted from vehicle exhaust, including CO (carbon monoxide), HC+NOx (hydrocarbons and nitrogen oxides), and PM (particulate matter, soot). Starting from January 1, 2004, Beijing upgraded its vehicle emission standards from Euro I to Euro II, and officially implemented Euro III standards by 2008. 2. Checking method: You can easily check a car's emission standard by looking at the label on the back of its environmental protection compliance sticker. The vehicle conformity certificate's first page contains emission standard information, though it's not directly labeled as China III/IV but rather appears as a string of characters.