If you suffer from sinus allergies, you should know the holidays harbor its own brand of histamine triggers that can impact you at any time. Each year, cooler temperatures coupled with a full lineup of get-togethers in uncontrolled spaces can present a unique range of allergen-filled environments. With all the doors and windows closed, heating systems turned on for the first time in months, and rooms adorned with evergreens and dusty decor, any Yuletide gathering can easily turn into an allergic sneeze-fest. The Asthma and Allergy Foundation of America estimates that as many as 30 percent of adults and 40 percent of children are affected by allergies. The good news is you don’t need to skip the festivities just because you’re sensitive. With some simple observations and lifestyle changes, you can skate by some of the holiday sneezing and congestion.