As early as the beginning of September, the State Environmental Protection Bureau informed the media that after preliminary analysis by relevant experts, this year's heavy polluted air will come earlier than this year, and it will be more "fierce." Recently, the haze weather has begun to appear: According to the latest report of the Central Meteorological Observatory, affected by strong cold air, the smog returned to Beijing-Tianjin-Hebei on the 26th, the capital was shrouded in fog, and most of North China were also in the foggy yellow warning. . Obviously, the coming winter will be the time for the fog to wreak havoc.
When it comes to smog, it is undoubtedly harmful to people. According to a new study published in the Proceedings of the National Academy of Sciences (PNAS), air pollution has shortened the life expectancy of residents in northern China by an average of 5.5 years and increased the incidence of lung cancer, heart disease and stroke. Therefore, effective protective measures are necessary.
For cars, air-conditioning filters are like masks that block airborne impurities, bacteria, exhaust gases, and PM2.5 contaminants from entering the vehicle. At present, there are various types of air conditioning filters in the automotive supplies market. Next, let's talk about how to choose air conditioning filters.
1, ordinary filter paper type
The ordinary filter paper type air conditioner filter element realizes the filtration of air by folding the white filament non-woven fabric to form a wrinkle of a certain thickness. Since the filter layer is mainly made of ordinary filter paper or non-woven fabric, only the air can be simply filtered, and the filtration effect on formaldehyde or PM2.5 particles is very poor. This type is the original air conditioning filter that most models are equipped with at the factory.
Advantages: small wind resistance air conditioning, large air volume, low price, not easy to breed bacteria and produce odor.
Disadvantages: Poor filtration effect, can not resist small dust, germs, PM2.5 particles and harmful gases.
2, activated carbon filter
The activated carbon filter element is based on the fiber filter layer, and the activated carbon layer is added to upgrade the single-effect filtration to double-effect filtration. Due to the adsorption characteristics of activated carbon, in addition to the adsorption of harmful gases such as formaldehyde, it also has the effect of removing odor. Activated carbon filter effect is better than ordinary filter paper type.
Advantages: double filtration, moisture resistance, odor removal.
Disadvantages: The air volume is relatively small and cannot filter PM2.5 fine particles.
3, HEPA filter
"HEPA" is an abbreviation for High Efficiency Particulate Air Filter, which means a high efficiency particle air filter. The HEPA standard is that the filtration efficiency for a 0.3 micron particle (PM0.3) is 99.97%. It can be seen that HEPA has a very strong filtering capacity and is the best among all filter materials in terms of filtering PM2.5. HEPA filters are also often used in air purifiers. But unfortunately, a single HEPA filter can only play the role of single-effect filtration, and the filtration effect on harmful gases such as formaldehyde is poor.
Advantages: Filtering PM2.5 works well.
Disadvantages: The effect of filtering harmful gases is poor.
4, HEPA filter paper + activated carbon layer filter
This is a composite air-conditioning filter that uses double-filtering of HEPA filter paper and activated carbon. The air enters the HEPA filter paper to filter the particulate matter, removes the PM2.5, and then adsorbs the harmful gas through the adsorption of the activated carbon layer, and finally sends the clean air to the air conditioning system.
Advantages: Multi-effect filtration effect, PM2.5 and harmful gases can be effectively removed.
Disadvantages: The wind resistance is large, and the air conditioning volume is small.
The above is the mainstream air-conditioning filter type on the market. The HEPA filter paper + activated carbon type air conditioner filter has a good effect on the comprehensive filtering effect of anti-mite and harmful gas removal. Only a few mid-to-high-end models will be adopted. It is worth mentioning that as one of Geely's fist products, the new Emgrand is equipped with a professional-grade PM2.5 filter with four layers of activated carbon filter + HEPA filter paper, which can effectively eliminate harmful gases such as formaldehyde and benzene. The particle dust filtration effect above PM2.5 is 97%. Coupled with plasma sterilization and deodorization technology and negative ion air fresh technology, there is a fresh air inside the car.
In the days when the smog is shrouded, in order to allow the family and themselves to breathe in the car, it is time to consider replacing the air-conditioning filter of the car.
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