This standard specifies three methods for determining the ozone concentration in test chambers used for ozone aging resistance tests of rubber. These include the reference method A (ultraviolet absorption method), the instrumental analysis method B (including electrochemical and chemiluminescence methods), and the wet chemical method C. This standard is primarily used for calibrating and verifying these environmental simulation devices, serving as a prerequisite for ensuring the accuracy and comparability of ozone cracking resistance test results for rubber materials (such as vulcanized rubber or thermoplastic rubber). Implementation of this standard typically involves specialized equipment such as ultraviolet ozone analyzers, electrochemical sensors, or chemiluminescence detectors.