In the last several years, scientific evidence has indicated that the air within homes and other buildings can be more seriously polluted than the outdoor air in even the largest and most industrialized cities. Other research indicates that people spend 90% of their time indoors. Thus for many people, the risks to health may be greater due to exposure to air pollution indoors than outdoors. http://www.epa.gov/iaq/
Indoor pollution sources that release gases or particles into the air are the primary cause of indoor air quality problems in homes. Inadequate ventilation can increase indoor pollutant levels by not bringing in enough outdoor air to dilute emissions from indoor sources and not carrying indoor air pollutants out of the home. High temperature and humidity levels can also increase concentrations’ of some pollutants. Relative humidity of 30%-50% is recommended to control biological contaminants.
There are many sources of indoor air pollution in any home.
Combustion sources: oil, gas, kerosene, coil, wood and tobacco products.
Building materials and furnishings: asbestos-containing insulation, wet or damp carpet, furniture made of certain pressed wood products.
Products: household cleaning and maintenance, air fresheners, personal care and hobbies.
HVAC: central heating and cooling system, humidifiers.
Outdoor sources: pesticides, radon, outdoor air pollution.
Houseplants: over watered damp soil can promote the growth of microorganisms’ which can affect allergic individuals
Biological Contaminates: bacteria, molds, mildew, viruses, animal dander and cat saliva, house dust mites, cockroaches, and pollen.
Install & use exhaust fans that are vented to the outdoors in kitchens and bathrooms to minimize moisture and pollutants that vaporize from hot water.
Ventilate the attic and crawl spaces to prevent moisture build up.
Keep the house clean frequent cleaning can reduce dust mites, pollens, animal dander.
Inspect all air handling & heating systems. Make sure all venting is free of blockages, cracks or leaks and installed properly. Check heat exchanges for holes or cracks. Make sure all combustion flames are adjusted correctly.
Upgrade you filtering system. A Merv 16 filter is 95% efficient and will trap bacteria.
Install a heat recovery ventilator to bring fresh air into the home.
With the concerns of indoor air quality the industry has developed many, many products that can help in make the air you breath as clean as possible.