“Where people live, work, and play has an impact on their health. Several factors create disparities in a community’s health. Examples include socioeconomic status, land use/the built environment, race/ethnicity, and environmental injustice. In addition, displacement has many health implications that contribute to disparities among special populations, including the poor, women, children, the elderly, and members of racial/ethnic minority groups.
These special populations are at increased risk for the negative consequences of gentrification. Studies indicate that vulnerable populations typically have shorter life expectancy; higher cancer rates; more birth defects; greater infant mortality; and higher incidence of asthma, diabetes, and cardiovascular disease. In addition, increasing evidence shows that these populations have an unequal share of residential exposure to hazardous substances such as lead paint.”
Read the whole story at CDC – Healthy Places – Health Effects of Gentrification.
Places. 
http://www.who.int/bulletin/volumes/89/10/11-021011/en/index.html
Interesting article – the WHO has looked at Glasgow which shows huge discrepancies based on wheree people live in the city and there is even something called the Glasgow effect!