Nitrogen dioxideNITROGEN DIOXIDE (NO2) Sources: Kerosene heaters, unvented gas stoves and heaters. Environmental tobacco smoke. Health Effects: Eye, nose, and throat irritation. May cause impaired lung function and increased respiratory infections in young children. Levels in Homes: Average level in homes without combustion appliances is about half that of outdoors. In homes with gas stoves, kerosene heaters, or unvented gas space heaters, indoor levels often exceed outdoor levels. Steps to Reduce Exposure: See steps under carbon monoxide .
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