The GB/T 28628-2012 standard specifies a test method for the amount of induced air ions in materials, including definitions of terms, test principles, systems and conditions, sample preparation and test steps. The standard applies to a variety of materials capable of inducing air ions, such as Coatings, sheets, wallpaper, etc. The test determines the amount of air ions induced by materials by applying a voltage to an ion collector, forming an electric field to trap air ions, and measuring the voltage change caused by the captured charge through a capacitor. The standard aims to provide a uniform test method to ensure the accuracy and conformity of measurement results.