However, it would be unrealistic to expect to completely remove formaldehyde from the air. Some persons who are extremely sensitive to formaldehyde may need to reduce or stop using these products. Increasing the flow of outdoor air to the inside decreases the formaldehyde levels. Decreasing this flow of outdoor air by sealing the residence or office increases the formaldehyde level in the indoor air. As the temperature rises, more formaldehyde is emitted from the product.
Humidity also affects the release of formaldehyde from the product.
As humidity rises more formaldehyde is released. Levels may be high on a hot and humid day and low on a cool, dry day. Understanding these factors is important when you consider measuring the levels of formaldehyde. As they age, the formaldehyde release decreases. Many of these homes had high levels of formaldehyde soon afterwards.