Fig. 2From: Study Protocol. Evaluating the life-course health impact of a city-wide system approach to improve air quality in Bradford, UK: A quasi-experimental study with implementation and process evaluationOutline of conceptual framework (adapted from MRC Guidance for Process Evaluation of Complex interventions) NB *: Analysed data provided via DEFRA national evaluation [39]; # Anonymised vehicle Fleet composition Data are provided by Department for Transport who process the data from the Bradford MB Council Automatic Number Plate Recognition systemBack to article page