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Can Air-Conditioners Cause Sinus Congestion?

If you have any kind of allergies or sinus problems at all, you probably know a sudden blast of cold air can trigger a sneeze or two, as well as make your nose run. But did you know that not keeping your air conditioner filter clean can also cause allergy symptoms? According to The New York Times, this may be one reason you develop congestion during the summertime. Springtime is notorious for allergy-producing air, with newly-budding trees and flowering bushes sending spores everywhere....

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