Nancy Krieger has been one of the leading voices in documenting how social 'axes of difference', including race, ethnicity and class make people vulnerable to poor health and limit their access to effective health care. We discuss the importance of 'locating' diversity in health inequalities research. This includes critically dissecting racial and ethnic axes into more nuanced social categories that incorporate differences based on immigration and other factors. It also involves considering how diverse population groups vary in their perception and use of space for healthrelated activities and exposures. Examples relating to immigrant populations' health and access to health care are discussed.
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