According to the research report, 4.3 million people died due to air pollution in kitchens in 2012. When can the harm caused by indoor air pollution stop? Maybe, you don't know, the air in your room every day is cloudy, and the air you breathe every day has harmful gases that you are totally unexpected. Let's follow and have a look.
What are the sources of indoor pollutants?
1. Organic pollutants
formaldehyde
Indoor formaldehyde mainly comes from building materials, furniture, various adhesives, coatings, synthetic fabrics, wood-based panels and other places. Formaldehyde is a kind of volatile organic compounds with strong pungent odor. Its effect on human health is manifested in stimulating eyes and respiratory tract, resulting in abnormal lung, liver and immune functions.
Benzene and its homologues toluene, xylene
Benzene and its homologues toluene and xylene are colorless and aromatic, and exist in the air in the state of vapor. In the indoor decoration, due to the improper selection of decoration materials or the unreasonable construction technology, it is easy to form indoor benzene and benzene series pollution. The toxicity of toluene and xylene is mainly harmful to the central and autonomic nerves. According to the national health standard, the maximum allowable concentration of indoor benzene should not exceed 2.4mg/m3.
Volatile organic compounds
The main impact of VOCs on human body is to stimulate eyes and respiratory tract, cause skin allergy, and cause headache, sore throat, fatigue and other symptoms. VOCs mainly come from interior decoration materials, daily chemical products, fuels, etc.
2. Inorganic pollutants
heavy metal
Heavy metals in the air exist in atmospheric particulates, and PM10 with particle size less than 10 μ m (PM10) contains more heavy metals. It is reported that about 75% - 90% of heavy metals are distributed in PM10, and the smaller the particle size, the higher the content of heavy metals.
Lead, cadmium, chromium, mercury, arsenic are common toxic pollutants, and their soluble substances have obvious harm to human body. Long term exposure to chromium compounds in the skin can cause contact dermatitis or eczema. Excessive lead, cadmium, mercury and arsenic can harm the nervous and visceral system of human body, especially the growth and intelligence development of children. Heavy metal elements mainly come from furniture, interior wall coating and wall Paper, etc., the particles from coal-fired fuel and chemical production from outdoor sources enter the room, which will also bring heavy metal pollution.
Gaseous inorganic pollutants
Ammonia is a colorless gas with strong pungent odor. It is easily soluble in water and has corrosive and irritant effects on the contact tissues. The atmosphere is highly irritant and has quick effect on eyes, throat and upper respiratory tract. However, its release period is also fast and it is less harmful to human body. The main reason for the existence of atmosphere in indoor air is due to the concrete admixtures, additives and whitening agents used in construction in winter.
It also contains harmful gases entering the room from the outside atmosphere. It is often due to geographical location. For example: sulfur oxides, carbon oxides, mainly carbon monoxide (carbon dioxide does not belong to atmospheric pollutants), and nitrogen oxides.
3. Biological pollution
Biological pollution is mainly caused by damp and moldy walls, domestic garbage, pets, indoor flowers, carpets, air conditioning, furniture, etc. the main pollutants are bacteria, bacteria and dust wax. Biological pollutants such as influenza virus, Mycobacterium tuberculosis and Streptococcus are emitted through coughing and sneezing.
How should indoor air control do?
Air purifier can absorb, decompose or transform all kinds of air pollutants (generally including PM2.5, dust, pollen, odor, formaldehyde and other decoration pollution, bacteria, allergens, etc.), which can effectively improve the indoor air cleanliness under the existing conditions. In recent years, it is favored by users.
Working principle of purifier:
The air purifier is mainly composed of motor, fan, air filter screen and other systems. Its working principle is: the motor and fan in the machine make the indoor air circulating and flowing. After the polluted air passes through the air filter screen in the machine, various pollutants will be removed or absorbed. Some air purifiers will also install negative ion generator at the air outlet (in the negative ion generator when working) High voltage produces DC negative high voltage), which ionizes the air continuously and produces a large number of negative ions, which are sent out by micro fan to form negative ion airflow, so as to achieve the purpose of cleaning and purifying air.
According to the purification demand, air purifiers can be divided into:
1. Purified type. If it is located in the area with moderate indoor humidity, or the air quality requirement is not too high, then choose the purified air purifier to meet the demand.
2. Humidification and purification type. If it is located in a relatively dry area, often open the air conditioner is dehumidified by the air conditioner, or the indoor air quality is required to be high, it is the most suitable choice to purchase an air purifier with humidification and purification function. LG future celebrity air purifier also has natural humidification technology, using scientific and technological means to achieve water vaporization, through windmill or disc filter rotation, harmful substances will be left in the tray to eliminate, only ultra-fine and clean water molecules into the air.
3. Intelligent. If you like automatic operation, intelligent monitoring of air quality, or to reflect noble taste, or for gifts need to be more decent, then choose an intelligent air purifier is the best choice.
4. Vehicle type. If it is used for the air purification in the car, it needs to specially purify the car odor, car formaldehyde and other interior pollution, and can be placed in the car air purifier. Therefore, the best choice is the on-board air purifier.
5. Desktop type. That is placed on the desktop, clean the air around the desktop within a certain range, to protect the health of people near the table top air purifier. If you often sit in front of a computer, desk, or desk, but the indoor area is not small, or in public places, it is not cost-effective or fashionable to buy a large air purifier at your own expense, then desktop air purifier is a better choice.
6. Large and medium-sized. It is mainly suitable for indoor occasions with large area, such as home hall, senior bank office, senior administrative office, important lecture hall, conference hall, senior hotel, hospital, beauty salon, kindergarten and other occasions.
7. Central air conditioning system type. It is mainly applicable to the installation of central air conditioning, or a single room with ceiling or multiple rooms purification together.
How much do you know about air purifier purchase?
1. Choose the right purchasing channel
When purchasing air purifiers, it is recommended to purchase air purifiers through regular channels such as large shopping malls, electrical appliances stores, brand stores and mainstream e-commerce websites.
As of 2013, the brand, function, performance, appearance design and price of air purifiers are very different, which makes people dazzled. It is suggested that consumers choose products according to their actual needs, not the more functions, the better.
For example, for consumers who need to protect PM2.5, it is recommended to choose the air purifier with outstanding purification capacity of PM2.5. Newly decorated families can focus on the removal of formaldehyde and toluene outstanding air purifier.
2. Filtration technology
The filtration technology of particulate pollutants is mainly HEPA filter screen. The quality of HEPA filter screen is uneven. Although some small brand filters have high filtration efficiency, they have high resistance, low energy efficiency ratio, and are easy to block and have short service life. Generally, it is recommended to select HEPA filter screen with electrostatic electret. Electrostatic electret technology makes non-woven fabric fiber with positive and negative electricity, which can effectively capture Many HEPA filters claim to have electrostatic electret technology to catch particles in the air. However, due to technical reasons, the electret charge of many filters will decay rapidly in a short time, resulting in the reduction of filtration efficiency.
The HEPA filter screen on the market, such as 3M electrostatic electret, can be selected. The same electrostatic electret technology can be used with 3M mask to ensure permanent electret efficiency without attenuation.
3. Pay attention to applicable area or particulate clean air volume (Cadr)
The purification capacity of air purifier is mainly determined by the applicable area and particulate clean air volume (Cadr: the rate of clean air provided), and the relationship between the two is: applicable area = Cadr × 0.1. The purification capacity of other pollutants should be combined with the applicable area.
4. Energy efficiency ratio and energy efficiency grade
The air purifier is usually used continuously for a long time. As an important indicator to measure the purification capacity and power consumption of air purifier, energy efficiency ratio deserves our attention. The higher the energy efficiency ratio and the energy efficiency grade, the more energy-saving and lower cost of air purifier.
5. Ozone emission
As a strong oxidant, ozone has certain purification capacity, but it is harmful to human body. The state has mandatory safety requirements for ozone emission from air purifiers, which is limited to ≤ 5 × 10-6% (ozone has fishy smell).
Want indoor air health, from which aspects should we insist?
Rapid purification: at the initial stage of air purifier operation, it is recommended to operate at the maximum air volume level for at least 30 minutes, and then adjust to other gears to achieve the effect of rapid air purification.
Purification pollution: when using air purifier to remove outdoor air pollutants, it is recommended to keep doors and windows in a relatively sealed state as far as possible, so as to avoid the degradation of purification effect caused by a large amount of interactive circulation of indoor and outdoor air. Long time use, should pay attention to periodic ventilation.
Decoration purification: if it is used to purify indoor gaseous pollution (such as formaldehyde, benzene, toluene, etc.) brought by decoration, it is recommended to use it after effective ventilation.
Guarantee effect: regularly replace or clean the filter to ensure the purification effect of the air purifier, and avoid the secondary discharge of pollutants adsorbed by the failure filter.
Long term unused: before the air purifier which has not been used for a long time is started again, the cleanliness of its inner wall and the state of the filter shall be checked, and the corresponding cleaning work shall be done, and the filter shall be replaced if necessary.
Indoor air pollution can not be ignored. If you want to breathe healthily and breathe healthily, we should start from indoor health and do a good job in the treatment and purification of indoor air.
