Dr. Greene writes:
[P]reschoolers with gas appliances in their homes scored lower on cognitive tests and were more likely to have ADHD than their peers. Researchers visited the homes of 482 babies in the first twelve weeks of life to count gas appliances in the homes and to install a device to measure average nitrogen dioxide levels in the kitchen over a two week period. Nitrogen dioxide is an odorless gas that can be released from cooking on a gas stove. Later, when the children were four years old, researchers performed detailed testing of their intelligence and behavior. They found a direct relationship between the number of gas appliances (especially unvented gas appliances), the level of nitrogen dioxide in the indoor air, and the odds of having ADHD (especially the inability to pay attention). They also found slightly lower scores on cognitive tests (especially on tests of verbal intelligence and on executive function). These associations remained even after adjusting for other potential factors such as breastfeeding, smoking or drinking during pregnancy, educational level, or income.
Read the rest at drgreene.com