A task of validation of the SO2LH products is presented in the FTR of OPAS SESAR Engage-KTN project (…), describing an SO2LH uncertainty of 1-2 km. The Business Logic may involve more work of validations such as: compliance issue regarding the 1-2 km resolution for the SO2LH products; a study of the consequence of failing and the impact on advisory information for the VAACs and exposure dose estimates from other stakeholders, including more airlines consultations or consultation from stakeholders directly working with airlines.