These appliances include space heaters, gas ranges and ovens, furnaces, gas water heaters, gas clothes dryers, wood or coal-burning stoves, and fireplaces. Three combustion pollutants in particular could affect people with asthma. Both nitrogen dioxide and sulfur dioxide can cause irritation of the respiratory tract and cause shortness of breath. People with asthma may be more susceptible to the effects of nitrogen dioxide and sulfur dioxide. Also, particulate matter may decrease lung function in asthmatics.
Combustion always produces water vapor.
Water vapor is not usually considered a pollutant, but it can act as one. It can result in high humidity and wet surfaces. These conditions encourage the growth of biological pollutants such as house dust mites, molds, and bacteria. Actions You Can Take Proper selection, installation, inspection and maintenance of your appliances are extremely important in reducing your exposure to these pollutants. Providing good ventilation in your home and correctly using your appliance can also reduce your exposure to these pollutants.