There are a few main factors that determine whether a person will be prone to developing mold spore allergies:
1.Hereditary: If members of your family currently have or had problems with allergies, you are more likely to have allergies as well. If both of your parents are allergic to mold (or anything else for that matter), you have a 75% chance of developing mold allergies as well. If only one parent – or relatives on only one side of your family-has allergies, your chances of being allergic to mold drops to 50%. Individuals with asthma are also more likely to be allergic to mold, especially if they are also allergic to other allergens, like dust mites or animal dander.
2.Exposure: People who live in humid climates or areas prone to flooding are more likely to find mold growing in their homes. Depending on the age of the house, layout, ventilation and cleaning habits, one house may have a far higher amount of mold spores in the air than another. The higher the concentration of mold spores indoors, the better the chances of developing allergic sensitivity from exposure. Outdoor mold can also be a problem, but it is the year-round indoor mold that causes the most trouble when it comes to developing allergies. Occupations with high mold exposure are: farming, dairy work, logging, baking, millwork, carpentry, greenhouse work, winemaking and furniture repair.
3.Age: Mold allergies and prevalent in all age groups, but young children with a family history of allergies or mold exposure are more likely to develop mold allergies.
Indoor Air Quality Solutions, IAQS 
One effective way to combat mold problems is by the use of desiccants like Silica Gel. These are the same small sachets you find in packaging of various products like electronics, garments, etc.
Silica Gel works by absorbing the moisture in its surrounding area. For most mold challenges, it does the job pretty well. Small sachets cost less than a dollar. It truly is a cost effective way of protection from moisture.
There is a lot more information on our website at http://www.SilicaGel.net