Buy an air purifier first to understand technical terms.

In recent weeks, PM2.5 monitoring data from several cities across the country has shown a sharp increase. Faced with worsening smog, some netizens remarked, “The invisible and intangible air is now visible and tangible. Every breath feels heavy.” According to reports from Sichuan Suning Appliance, air purifiers have seen a surge in demand over the past two months, with sales rising by more than 200% year-on-year. To meet this growing demand, Suning launched a special promotion starting this week, offering a 50% discount on the second unit when purchasing two purifiers. Online platforms also witnessed a significant rise in sales for brands like Yadu, Panasonic, and Daikin. For instance, the Yadu Air Purifier sold over 20,000 units in just two weeks on Tmall’s official flagship store, from January 13 to 28. **Approximate Classification** **Basic Type + Formaldehyde & Benzene Removal Type** Lin Wubao, manager of Sichuan Suning Life Electric Appliances Department, explained that current air purifiers come with various functions such as removing formaldehyde, odors, smoke, dust, sterilization, and humidity control. However, they are generally divided into two main categories: the basic type and the formaldehyde/benzene removal type. The basic type offers essential functions like smoke removal, dust filtration, sterilization, and odor elimination, typically priced under 2,000 yuan. High-end models can be as low as a few hundred yuan. The other category includes the same basic functions but also targets harmful gases like formaldehyde and benzene found in newly decorated homes, usually priced between 2,500 and 5,000 yuan. Lin noted that products around 3,500 yuan are currently the top sellers. At Philips Chengdu, the sales manager added that with more people staying indoors during the end of the year, sales of their air purifiers increased sharply, especially in mid-to-high-end models that do not focus solely on formaldehyde and benzene removal. These models were quickly sold out. **Technical Explanation** At the Suning Chunxi store, the air purifier section spans hundreds of square meters, filled with a wide range of options—from compact desktop models to large vertical units, and from humidifying to formaldehyde-removing systems. With so many technical terms like negative ion technology, electrostatic dust collection, and molecular complexation, it can be overwhelming for consumers. To help, the Chengdu Business Daily reporter spoke with experts who broke down these technologies. **Activated Carbon Adsorption Technology – Ideal for Particle Removal** According to Philips’ sales representative, activated carbon is a well-known material used in daily products like facial cleansers and deodorants due to its strong adsorption properties. This makes it a popular choice for air purifiers. Activated carbon purifiers work by using a fan to draw air through the filter, capturing pollutants like dust, particles, bacteria, and chemicals. It is the most common purification method used in most air purifiers. **Advantages:** Strong adsorption capacity, effective against harmful substances in indoor air. **Disadvantages:** Can release pollutants if not replaced regularly, leading to saturation. **Negative Ion Technology – Effective Against Second-Hand Smoke** Negative ion technology uses air ion generators to produce negatively charged ions, known as "negative oxygen ions." These ions help reduce active oxygen (free radicals) from pollutants like cigarette smoke and nitrogen oxides, improving air quality. They also neutralize airborne dust, making it fall to the ground. **Advantages:** Effective against second-hand smoke, improves blood oxygen levels, promotes metabolism, and reduces eye strain from electronics. **Disadvantages:** Short lifespan in air, less effective against formaldehyde and benzene pollution. **Electrostatic Dust Collection – Mainly for Particulate Matter** This technology uses high-voltage electrostatic adsorption to remove pollutants from the air. It's widely used in air purifiers, particularly in high-end models from brands like Honeywell. **Advantages:** Efficient at removing dust, smoke, pollen, and germs. **Disadvantages:** Can produce ozone and is less effective against chemical pollutants like formaldehyde. **Molecular Complexation Technology – A Helper for New Home Decorations** Sichuan Wuxing Electric suggested that for formaldehyde and benzene removal, molecular complexation technology is highly effective. It works by dissolving toxic gases into water-based solutions, converting them into harmless solid materials. **Advantages:** Highly effective against formaldehyde, benzene, and VOCs from new home decoration. **Disadvantages:** Requires regular replacement, especially in heavily polluted areas. **Low-Temperature Asymmetric Plasma Technology – Advanced Sterilization** This emerging technology generates plasmas that break down harmful gases, viruses, and bacteria, providing powerful sterilization, deodorization, and dust removal. **Advantages:** Energy-efficient, fast virus elimination, and enhances oxygen levels. **Disadvantages:** Still niche, limited availability, and higher cost. **Usage Tips** Different air purifiers are suitable for different spaces and should not be placed in fixed positions. For example, a 25-square-meter room needs a purifier with a 200-cubic-meter-per-hour airflow rating, while a 50-square-meter space may require a 400-cubic-meter model. Moving the purifier every few days ensures better air circulation. If you notice a musty smell, clean or replace the filter promptly. Regular cleaning and drying of the filter layer every few weeks prevent secondary pollution.

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