The carbon dioxide content in the air is generally 0.03%. When the carbon dioxide content reaches 0.05%, people's breathing will be uncomfortable; When its content reaches 0.2%, people will feel dizzy, palpitation and high blood pressure. In its normal physiological process, plants will release oxygen, absorb a lot of carbon dioxide, adjust the ratio of carbon to oxygen in the air, keep the air fresh and make people more comfortable.
In addition, some plants, such as cactus, have unique biological characteristics, and their origin is very dry, so their metabolism is different from that of ordinary plants. The stomata of these plants are closed during the day to reduce transpiration and opened at night to absorb carbon dioxide, so they are listed as flowers that can refresh the air at night.
Volatile organic compounds (VOCs) are the main indoor air pollutants, and more than 900 kinds have been identified. In addition to aldehydes, benzene, toluene, xylene, trichloroethylene and so on are common.
Their effects on human body are often foreign body stimulation, stench, nausea and poor breathing, which have different degrees of influence on human liver, kidney, brain and nervous system. Cooperation can reduce human immunity and even cause diseases and cancer.