The weather has improved, and the smog has gradually faded away. As a result, the air purifier industry, which once thrived on smog-related concerns, is now entering the "post-smog" era.
With the winter season arriving, many people in northern China have noticed a significant difference in air quality this year. In previous years, smog would often follow the start of heating, lingering for days or even weeks. However, this winter, Beijing hasn’t experienced a single real "smog day." The public is celebrating the sudden improvement in air quality, with social media filled with posts about the clear skies. Yet, there's also a sense of uncertainty—will this good weather last?
According to the "Comprehensive Management Action Plan for Air Pollution in the Beijing-Tianjin-Hebei Region and Surrounding Areas During Autumn and Winter 2017–2018," cities under the "2+26" initiative were required to complete the transition from coal to clean energy by the end of October this year. This includes replacing coal with gas and electricity, aiming to eliminate over 3 million households from using coal. Industry insiders believe that the promotion of the "coal-to-clean energy" policy is the main reason behind the extended period of clear skies in the region.
Looking ahead, with more environmental policies being implemented, smog days are expected to become even rarer. But with fewer smog days, will household appliances like air purifiers be affected? For example, air purifiers have been popular in recent years, especially during smog seasons. Many Chinese people see them as a “private doctor†for dealing with smog. However, as the weather improves, will air purifiers still be useful?
**Is Blue Sky Equal to Good Air Quality?**
In the eyes of most consumers, "good air quality" is directly linked to whether the sky is blue. But is that always true? According to monitoring data, it's not. From November 18 to December 17, the Air Quality Index (AQI) in Beijing ranged from 23 to 193. Under the Chinese standard, AQI levels above 75 indicate light pollution. In this 30-day period, only 4 days were classified as "light pollution."
But if we look at the stricter U.S. standards, the situation changes. Converting the data, the U.S. defines AQI below 50 as "mild pollution." Based on that, there were 15 days of pollution in the same period, including 4 days of moderate pollution. So, even though the sky may appear clear, the air quality isn't necessarily great.
**Is an Air Purifier Only Useful for Smog?**
Chinese consumers began paying attention to air purifiers because of their ability to remove smog, particularly PM2.5. As a result, many believe that without smog, air purifiers are useless. However, this is not entirely accurate. Air purifiers are actually imported products with a wide range of functions. They can humidify, remove allergens, sterilize through ionization, and deodorize.
Moreover, air purifiers play an important role in preventing viral infections. While they don’t kill viruses directly, they can capture particulate matter, which often carries viruses. When these particles are filtered out, the virus loses its activity, reducing the risk of respiratory diseases.
**Air Pollution Isn’t Just Smog**
While documentaries like Chai Jing’s "Under the Dome" raised awareness about smog, they also overshadowed
Other traditional pollutants. These include car exhaust, formaldehyde, toluene, and TVOCs released from home decor, as well as odors and secondhand smoke from household waste.
In addition to PM2.5, indoor pollutants like volatile organic compounds (TVOC), pet dander, and seasonal allergens such as pollen and catkins also contribute to poor air quality. As people become more health-conscious, air purifiers are becoming essential in every home.
Although the air quality in the Beijing-Tianjin-Hebei region has improved, it’s important to stay alert. With the return to work after winter, major projects may resume, and air quality could fluctuate again. Monitoring air conditions in real-time is crucial.
While the types of air pollution vary, air purifiers can effectively address them. The national standard GB/T18801-2015 sets guidelines for CADR (clean air delivery rate) and CCM (cumulative contaminant removal), offering clear classifications. Experts recommend choosing air purifiers based on the "three highs and one low" principle: high CADR, high CCM, high energy efficiency, and low noise. Opting for higher-grade models ensures better filtration of common household pollutants.
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