If I say , my first thought is a cactus , but I'm afraid the needle to me , not only small pot of cactus can absorb harmful gases indoor formaldehyde , ether , etc., but also at night to absorb carbon dioxide and release oxygen ,Purifying air. But also to reduce the harm of electromagnetic radiation . & Nbsp; The other is the aloe , aloe can purify the air of harmful gas formaldehyde , carbon dioxide, sulfur dioxide, carbon monoxide , etc., especially the absorption of formaldehyde particularly strong , very suitable for the newly renovated office. Aloe more than these features , as well as sterilization, adsorption and dust warning . ( Note: harmful gases serious , aloe leaves appear brown spots )