Having good air quality in your home is essential. Good air quality means less irritation from environmental irritants for those with allergies. Using air filters and purifiers not only makes the air more pleasant to breathe, but can also cut down on dust mites, mould, mildew, bacteria, and other types of air-borne, infectious organisms.
It could be caused by your furnace. When air is heated and forced through your home, it can lose its natural moisture, becoming dry. Overly dry air can be unpleasant and cause irritation, particularly in the form of sore, raspy throats. Using a humidifier is an easy way to prevent overly dry air in your home, and to help you breathe easier.