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Many of the illnesses develop from home. This is simply because the air quality is not as healthy as it can be. At times when all windows get closed, it pretty much promotes the pollutants as they are trapped in the home. Furnaces tend to blow the contaminants around and also shuffle up dust and allergens.
Air purification units help to reduce those allergen and pollutant levels in your home's air. It would be wise to at least get some filtration units for the most commonly used rooms. They are available in floor styles and table styles. Each model features different benefits such as filter monitoring, fan speed, oscillation, remote control, etc. No matter what type you choose, it will help clean the air. However, a more expensive model may be worthwhile if it reduces sicknesses more and gives you energy from cleaner air.
A second method involves your windows. Open your windows if possible and place fans in some of them. This will send the contaminated air outside while bringing fresh air in the house. You will have to clean the screens from time to time, but you won't mind when you see the results on your screens!
On another note, your vacuum could be polluting the air more than you think. Many vacuums have filtration to cut back on kicking up pollutants into the air, but that often does not work as well as claimed. In fact, many blow most contaminants back out into the air, even with HEPA filtration. Most benefits and drawbacks just depend on the model. No matter what model you have, you can upgrade with ease to something with newer technology that reduces the stuff that most vacuums throw into the air.
Every house in existence will always have air contaminants, no matter how much house cleaning you do. Even though you cannot completely eliminate it, you can at least control it and have a healthier home environment.