Reuters

Study author Dr. Ehud Keinan explained that the citrus ingredient is called limonene, and it likely protects against asthma by "burning" inhaled ozone, which can increase inflammation in the lungs.
Other scents - such as those emitted from pine trees, geraniums and roses - contain similar ingredients to limonene, Keinan said, which may help explain why asthma is much more common in urban areas that lack vegetation.

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