Guidelines & Tools Integrated Transport and Health Impact Modelling Tool (ITHIM) Published 2009 Share SHARE Facebook share Twitter LinkedIn Copy URL Email Download Download ithim en Added on: 20 May, 2025 Breadcrumb Home Resource Library Integrated Transport and Health Impact Modelling Tool (ITHIM) ITHIM refers to a range of related models and tools developed at CEDAR to perform integrated assessment of the health effects of transport scenarios and policies at the urban and national level. The health effects of transport policies are modelled through the changes in physical activity, road traffic injury risk, and exposure to fine particulate matter (PM2.5) air pollution. Some versions of ITHIM also predict changes in CO2 emissions. ITHIM is being used in research and by health and transport professionals to estimate the health impacts of scenarios, compare the impact of travel patterns in different places, and model the impact of interventions. ITHIM works either as a stand-alone model, or it can be linked with other models (e.g. transport, health, economic).