Help children avoid asthma attacks by improving home indoor air quality. More than 6 million American children – nearly 9 percent of all kids in the U.S. – have asthma, according to the Centers for Disease Control and Prevention. Each year, asthma attacks send more than a million people to emergency rooms, including approximately 24,000 children younger than 15, the CDC reports. Yet health experts agree many of those asthma attacks could be avoided through a range of tactics, including by improving air quality inside homes.