b'HOMES WITHOUT CARBON MONOXIDE (CO) ALARMS LEAVE OCCUPANTS VULNERABLE IF SOMETHING GOES WRONG, ALLOWING THE DEADLY GAS TO COLLECT IN LIVING AREAS.Over 20,000 people end up in OTHER HOMES MAY HAVEemergency departments each year HIGH RELATIVE HUMIDITYfrom unintentional CO poisoning.LEVELS THAT SUPPORT DUST MITES.46% of U.S. homes have bedding with dust mite allergen levels that could trigger an asthma attack.'