Air is often taken for granted as it is invisible and seems readily available to plants above ground. However, even though air is abundant in our atmosphere, there are factors that can disrupt the availability of fresh air to a plant. Stagnant air may be low on vital gases such as oxygen and high on other gases that may harm the plant.

For example, when plants are placed indoors, fresh air is depleted over time and can cause the build-up of toxic gases. A good example of this is a banana wrapped in a plastic bag. When wrapped in the bag, fresh air is depleted quickly. Oxygen levels drop and ethylene is released by the banana. The ethylene causes the banana to ripen faster than it would if it was sitting out in the open. These same types of reactions may happen to foliage plants if not exposed to fresh air, resulting in damaged or dead foliage.

Interior plants can accumulate dust, dirt, debris and other accumulates on their leaves. These accumulates can decrease gas exchange on the leaves as well as block much needed light from hitting the surface of the leaves. Keeping plant surfaces clean not only keeps them looking good aesthetically but also helps them perform better.

In some interior spaces, air movement is highly limited, causing stagnant air to build-up. The lack of fresh air may be insufficient in oxygen or other gases needed by the plant. It may also be high in gases that may harm the plant.