Table 1. Key Charateristics for Each City of Relevance to Heat Vulnerability.

attribute	Atlanta	Detroit	Phoenix
population size9	420,000	713,770	1,445,630
male population9	49%	48%	51%
population > 65 years of age9	10%	12%	9%
nonwhite population9	62%	89%	34%
persons in poverty9	26%	38%	23%
central air conditioning in home	94%	53%	99%
mean summer daily temperature range10	21–32 °C (71–89 °F)	17–28 °C (63–82°F)	28–41 °C (82–105°F)
climate zone11	mixed-humid	cold	hot–dry