Humidifiers can play a key role in creating healthier homes for those with asthma and allergies as relative humidity should stay between 40 and 50 percent. In order for a humidifier to earn Certification, strict standards for appropriate levels must be met when:

• Evaluating its capability to achieve and maintain relative humidity levels
• Analyzing its capability to sanitize the water during use
• Measuring its ability to reduce pre-existing contamination in the room.