1) releases oxygen to keep the air fresh.
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; Its content reaches 0? 2%, people will be dizzy, palpitations, and blood pressure will rise. 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.
2) Purify indoor air pollution
Modern people spend most of their time indoors, and the indoor air condition is closely related to human health. More and more studies show that there are many kinds of indoor pollutants and a wide range of pollution sources, which have many effects on human health. Typical indoor air pollutants and their effects on human health are as follows: (1) 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, odor, 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. (2) respirable suspended particulate matter (PM 10). Particles suspended in the air with aerodynamic equivalent diameter less than or equal to 10μm are called PM 10. PM 10 often causes respiratory infection, easily damages the narrow inner wall of respiratory tract, and leads to lung function damage, especially for asthma patients. Other indoor air pollutants include nitrogen oxides (nitrogen oxides), carbon monoxide (CO) and carbon dioxide (CO2).
3) Increase the concentration of negative ions in indoor air.
The promotion of negative ions on human health was discovered by a German doctor in 193 1. Although the mechanism of negative ions on human body is not completely clear, a large number of animal studies and clinical practices have confirmed that negative ions in air have many biological effects, and can affect many physiological indexes of human body, and have auxiliary treatment and rehabilitation effects on some diseases.
Air negative ions are known as "air vitamins and auxins", which have the functions of dust suppression and bacteriostasis, and have remarkable effects in purifying air, regulating microclimate, human health care, and preventing and treating diseases.
2. Plant volatiles have the functions of killing viruses, inhibiting bacteria and enhancing human immunity.
Plants will release a lot of volatile substances in physiological process. According to reports, most plants will produce volatiles, which have a certain antibacterial effect and can remove bacteria and viruses from the air.
American research shows that indoor rooms lacking plants contain 50% more bacteria than rooms with plants. In families with better room greening, the bacteria in the air can be reduced by about 40%. Plants can greatly reduce bacteria and harmful microorganisms in the air, and can also remove heavy metal particles in the air. Phytoncide secreted by asparagus, begonia and geranium can reduce the incidence of cold.