People living in areas closer to the equator were more likely to have allergies and asthma than those settled in locations further away from the equator, a study showed. Researchers said exposure to ultraviolet-B rays, which affects vitamin D production in the body, may explain the link between proximity to the equator and higher risks for allergy and asthma. The findings appear in the Annals of Allergy, Asthma & Immunology.

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