During Phoenix's summer months, it is especially dangerous to leave your children in a car without supervision. Vehicles in the Valley can heat up quickly when there's direct sunlight and no ventilation. Temperatures inside of a hot car can reach up to 158 degrees Fahrenheit, causing children to suffer from heatstroke.
According to The Arizona Republic, 49 children in the United States died of heat exposure while they were left in hot cars in 2010. The bodies of children heat up much faster than adults, as their thermoregulatory systems are less efficient than an adult's. So on average, a child's body temperature will warm 3 to 5 times faster than an adult's body temperature.