Over 10 million Americans suffer from allergies to pollen alone, which equals out to approximately one in every five people. Suffers of allergies have a disorder of their immune system and that is what causes the symptoms. There are many people that are super sensitive to dust, pollen, nuts, and bees these are allergies that could be life threatening if it turn into an anaphylactic reaction and not treated right away.
In hot dry climates it has been found that there are more allergens floating around in the air, rather then humid and cooler climates, which is not to be confused with reactions by anyone. In the spring and early summer is another time that there are a lot of allergens in the air this is because the plants and the trees are budding and this helps out the pollen.
There are some medical treatments that could help ward off the unpleasantness of allergies such as antihistamines, decongestants, and nasal steroids. However an expert in the allergy field may insist that to treat an allergy is to stay away from it altogether. In your house it would be a good idea to use an air cleaner with a HEPA filter, unlike nasal steroids. Filters that are HEPA eliminate just about all dust, and pollen out of the air. If you happen to be allergic to smoke, look into an activated carbon filter, they work awesome.
Ask anybody you know with an allergy how many different symptoms that they have, they will have a long list. New products are now available to aid on allergy problems. In the United States there are an increasing amount of people that have allergies, when people get tested over fifty percent have at least one allergen, and occassionally allergies as well. If you suffer from any type of allergy you should be able to fond somebody else that has the exact some allergy.
Disclaimer: As with any kind of health-related information, you should always consult your own personal doctor or physician before following any kind of medical advice.