Many people are allergic to airborne pollutants such as pollen.

许多人对空气中花粉之类的污染物质过敏。

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In this case mold feeds itself by dust, airborne particles such as pollen, and so on.

在这种情况下，霉菌靠空气中的微粒、灰尘为生，例如花粉等等。

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An over-reactive immune system is also the cause of allergies, where a harmless agent (such as pollen) can lead to an unnecessary immune response.

过激的免疫系统也是引起过敏的原因，本来无害的物质(如花粉)会引起不必要的免疫反应。

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An allergic reaction happens when the body identifies a normally harmless substance such as pollen as an invading germ.

CNN: Predicting allergy season eludes experts

But in the past researchers have focused on allergens in the air, Silverberg said, such as pollen or ragweed, instead of other environmental exposures.

CNN: Where do allergies come from?

Mr. Laib's installations involving other natural substances, such as pollen and rice, as well as beeswax have been displayed at prominent museums and galleries around the world, including New York's Museum of Modern Art.

WSJ: A Collaboration of Bees and Man: The Phillips Collection at the Laib Wax Room