"From now on, if you use bamboo charcoal and charcoal deodorizing bags, their adsorption effect is almost zero." An engineer surnamed Liu from Beijing Air Quality Testing Center believes that deodorizing bags with bamboo charcoal and charcoal as the main materials do not have the ability to adsorb formaldehyde. "Their adsorption ability is poor, not to mention formaldehyde." He added. The new "Determination Method of Purification Effect of Indoor Air Purification Products" will be officially implemented on September 1st this year. During the replacement period of new and old standards, there is no necessary detection standard for indoor air and environmental protection, especially for the efficacy of absorbing formaldehyde. Engineer Liu also mentioned that no enterprise sent its own deodorizing package products for inspection, and the testing center could not judge whether formaldehyde was adsorbed or not.

Guangsheng Song, director of the National Indoor Environment and Indoor Environmental Protection Products Quality Inspection Center, said that using activated carbon to adsorb some gases is a passive absorption, which will tend to be saturated after a period of adsorption. Bamboo charcoal and activated carbon have a certain adsorption effect. "To adsorb formaldehyde, generally modified activated carbon can adsorb it, but this modified activated carbon is more common in air purifiers." Guangsheng Song said that the difference between modified activated carbon and ordinary activated carbon is that the substances attached to its surface can react chemically with formaldehyde, so as to eliminate or neutralize formaldehyde. Only this kind of activated carbon can be called carbon capable of adsorbing formaldehyde. "The market for these things, especially bamboo charcoal deodorizing packages, is quite chaotic, and the efficacy of most products has been exaggerated." Guangsheng Song said.