The GAPH-TAG is a group of global experts on air quality and health issues which advise WHO: (a) on the data and methods used for tracking air pollution and its health impacts for the SDGs and beyond, (b) identifying effective air quality interventions in different sectors and (c) defining the role that the health sector can provide to protect health and reduce emissions and (d) advises WHO on the review, evaluation and strengthening of methods to assess health considerations in climate mitigation policies, particularly in relation to the nationally determined contributions (NDCs).