I met someone working for the city of Oakland who was researching similar things here. She pointed out that life expectancy in the 'flats' of Oakland was 7 year

I met someone working for the city of Oakland who was researching similar things here. She pointed out that life expectancy in the 'flats' of Oakland was 7 years lower than in the 'hills' of Oakland. That geographical boundary mostly separates the wealthy from the poor (though areas of the 'flats' are rapidly gentrifying). There are also other factors, such as proximity to pollution from highways and the ports, crime rates, etc.