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What are some of the reasons you have a runny nose? Learn how to determine the reason you have a runny nose to keep your family healthy.

Do allergies cause nasal congestion? Visit HowStuffWorks to learn if allergies cause nasal congestion.

How does the respiratory system defend itself? Visit HowStuffWorks to learn more about how the respiratory system defends itself from this article.

Are nosebleeds a sign of springtime allergies? Learn if nosebleeds are a sign of springtime allergies in this article.

Not everyone who has pollen allergies likes to take drugs. Learn whether cauliflower can help pollen allergies in this article.

Mold allergies can lead to lung conditions such as bronchitis. Find out how mold can cause bronchitis from this article.

Tree pollen allergies are a result of a mistake by your immune system. Learn some symptoms of tree pollen allergies in this article.

Visit HowStuffWorks to read and learn whether vitamin C can help treat respiratory congestion in this article.

Thyme is used in many herbal remedies for coughs and colds. Learn more about thyme and how to make thyme tea.

A killer smog 70 years ago helped lead to the first federal air pollution laws.

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