In July 2023, the CEN Technical Committee 264 ‘Air quality’ published the two new documents EN 15267-1:2023 ‘Air quality - Assessment of air quality monitoring equipment - Part 1: General principles of certification’ and EN 15267-2:2023 ‘Air quality - Assessment of air quality monitoring equipment - Part 2: Initial assessment of the manufacturer’s quality management system and post certification surveillance for the manufacturing process’ to improve measurement of air pollutants and support environmental protection.