When the sun is shining, the birds are chirping, and a light breeze is blowing, it is oh-so-tempting to throw open the windows and enjoy the sights, sounds and smells of spring. Maybe you are even itching (pun intended) to roll up your sleeves and tackle some serious spring cleaning. But if you are one of the more than 20 million sufferers of allergic rhinitis, commonly called hay fever, you know that picture-perfect scene brings ...