Sources: Unvented kerosene and gas heaters; leaking chimneys and furnaces; down-drafting from wood stoves and fireplaces; gas stoves. Automobile exhaust from attached garages. Environmental tobacco smoke.

Health Effects: Persistent headaches, nausea, fatigue, blurred vision, rapid heartbeat, loss of muscle control, flu-like symptoms that clear up upon leaving the house.

Steps to Reduce Exposure:

• Keep gas appliances properly adjusted.
• Consider purchasing vented gas space heaters and furnaces.
• Use proper fuel in kerosene space heaters.
• Install and use exhaust fan vented to outdoors over gas stoves.
• Open flues when gas fireplaces are in use.
• Choose properly sized wood stoves that are certified to meet EPA emission standards.
• Make certain that doors on all wood stoves fit tightly.
• Have a trained professional inspect, clean, and tune up central heating system (furnaces, flues, and chimneys) annually. Repair any leaks properly.
• Do not idle car inside garage