How to Choose a Good Air Purifier

Key facts

• Over 55% of the world’s population live in urban areas and this is set to rise to 68% by 2050.
• Almost 40% of urban dwellers have no access to safely managed sanitation services and many lack access to adequate drinking water.
• An estimated 91% of people in urban areas breathe polluted air.
• Poorly designed urban transport systems create a range of threats including road traffic injuries, air and noise pollution and barriers to safe physical activity – all leading to higher levels of noncommunicable disease and injuries.
• Continued urbanization is expected to lead to cities becoming epicentres of disease transmission, including vector-borne diseases.

Facing the increasingly serious air pollution problem, it is very necessary to ensure that the air we breathe is healthy and clean. Air purifiers are the best tools for treating air, so it is important to choose a suitable and effective air purifier. How to choose an air purifier? Here are a few things you need to know:

CADR

CADR value (Clean Air Delivery Rate),?Chinese name?clean air output ratio?, refers to the ratio of the air purifier output clean air obtained by the American Association of Home Appliance Manufacturers (AHAM) in accordance with strict testing standards.?The higher the CADR value, the higher the purification efficiency of the purifier.

It is often used to indicate the purification efficiency of air purifiers.Different filters have different abilities to remove different particle distributions, so three CADR's for a given device are typically measured: smoke, pollen, and dust.? According to the applicable area calculation formula stipulated by the AHAM standard: ##Applicable area≈0.084*CADR##

So you can choose the right air purifier according to the size of your room.

FILTER

Air purifiers generally have three layers of filters: Pre-filter, HEPA Filter, and Activated carbon filter. Therefore, when you choose an air purifier, you should try to choose a purifier with these three filters.

Pre-filter: The pre-filter is usually a combination of ABS and mesh, washable. Its purpose is to intercept larger airborne particles such as hair and leaves. It can prolong the life of the hepa filter behind.

HEPA Filter: For an air purifier, the HEPA filter is the most important filter. HEPA filters are usually divided into four grades: HEPA11, HEPA12, HEPA13, and HEPA14. According to the different grades, the filtration efficiency can reach 95%-99.95%. Among them, HEPA11 and HEPA13 are the most commonly used filters. Because the filter grade is inversely proportional to the CADR, the higher the filter grade, the lower the CADR. So you need to find a balance directly between CADR and HEPA levels. My suggestion is to choose a HEPA13 filter. Because it can filter 0.3 micron fine particles with an efficiency of 99.95%, such as pollen, second-hand smoke, etc. As for why the HEPA filter can filter 0.3 micron particles and its mechanism, if you are interested, the following article may help you.

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Activated Carbon Filter: Activated charcoal works primarily to remove odors such as secondhand smoke and bad odors from food or other things.

UV Lamp& Photocatalyst Filter

The COVID-19 pandemic has shown that cities often bear the brunt of emergencies. Citizens frequently have high exposure to the virus and have no space or the means to protect themselves. Overcrowding and lack of clean sanitation services increase the risk of contagion, limit residents’ ability to adhere to public health measures and increase the likelihood of interpersonal violence.

So if you want to fight the virus, I recommend you to choose an air purifier with UV light. There are mainly three types of UV lamps: UV-A, UV-B and UV-C, among which UVC Lamp is mainly used for disinfection. UV-A and UV-B can cause harm to human body, so before you choose air purification When you use the device, you'd better choose UV-C lamp. Generally speaking, in air purifiers, UV lamps are often used with photocatalyst filters. UV has also been shown to reduce gaseous contaminants such as carbon monoxide and VOCs. UV lamps radiating at 184 and 254 nm can remove low concentrations of hydrocarbons and carbon monoxide if the air is recycled between the room and the lamp chamber. This arrangement prevents the introduction of ozone into the treated air. Likewise, air may be treated by passing by a single UV source operating at 184 nm and passed over iron pentaoxide to remove the ozone produced by the UV lamp.

In short, UVC lamps can kill viruses and bacteria, and when used with photocatalyst filters, they can decompose volatile gases such as formaldehyde.

Anion

The negative ion function is more like a kind of bionics to the air purifier. Usually in the outdoor forest, the content of negative ions will be high, and the effect of negative ions is to make people feel refreshed. The negative ion function of the air purifier is to imitate the negative ions in the forest, thereby making people more awake.

Sensor

Generally speaking, the air purifier will have a pm2.5 sensor, which can detect the indoor air quality and let you know at any time whether the environment you are in is good or bad. If you want to choose a better air purifier, you can choose an air purifier with TVOC sensor and temperature and humidity sensor, these functions can better help you understand the surrounding environment and give you a better living environment.

Other Functions

Like most small appliances, air purifiers have many functions. For your convenience, air purifiers generally have wind speed adjustment, timing, and three modes (automatic mode, silent mode, sleep mode), Child lock, filter replacement reminder, etc.

Hope this article can help you better understand and choose an air purifier.

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