This guideline specifies the procedures for testing conformity with the performance criteria on automated measuring systems for the point-related monitoring of gaseous and particulate pollutants in ambient air, which are specified in VDI 4202 Part 1. For measuring systems with measuring principles according to DIN EN 14211, DIN EN 14212, DIN- EN 14625, DIN EN 14526 and DIN EN 14662-3 as well as DIN EN 12341 and DIN EN 14907 the test procedures specified in this guideline are identical to the European test procedures. This guideline applies to all performance tests of automated ambient air quality measuring systems, the use of which is intended for tasks in the area of air quality monitoring covered by law. It shall be applied only in conjunction with VDI 4202 Part 1 and VD 4203 Part 1. This guideline is addressed to manufactures of automated ambient air measuring systems, to test institutes performing performance tests of such measuring systems, and to the authorities responsible for the declaration of suitability. Furthermore, it assists users of performance-tested measuring systems in the method verification and in the assessment of the quality of measuring results obtained.