As early as the beginning of September, the State Environmental Protection Bureau informed the media that, according to preliminary analysis by experts, this year’s severe air pollution is expected to arrive earlier and be more intense than in previous years. Recently, haze has already begun to make its appearance. According to the latest report from the Central Meteorological Observatory, affected by a strong cold front, smog returned to the Beijing-Tianjin-Hebei region on the 26th, with the capital shrouded in fog and much of North China under yellow smog warnings. It seems clear that winter will bring another period of heavy smog, making it essential to take protective measures.
When it comes to smog, the health risks are undeniable. A recent study published in the *Proceedings of the National Academy of Sciences (PNAS)* found that air pollution has reduced life expectancy for residents in northern China by an average of 5.5 years. It also increases the risk of lung cancer, heart disease, and stroke. Therefore, taking effective precautions is crucial, especially when spending time indoors or in vehicles.
For cars, air conditioning filters act like masks, blocking harmful particles such as dust, bacteria, exhaust fumes, and PM2.5 from entering the cabin. There are various types of air conditioning filters available in the market today. Let’s explore how to choose the right one.
**1. Ordinary Filter Paper Type**
This type of filter uses folded white filament non-woven fabric to create a pleated structure for basic air filtration. Since it's made mainly of regular filter paper or non-woven material, it only provides minimal filtration, offering poor performance against formaldehyde or PM2.5 particles. Most factory-installed car filters fall into this category.
**Advantages:** Low resistance, large airflow, affordable price, and less likely to breed bacteria or emit odors.
**Disadvantages:** Limited filtration capability, unable to block fine dust, germs, PM2.5, or harmful gases.
**2. Activated Carbon Filter**
This filter adds an activated carbon layer to the fiber filter, providing double-action filtration. The activated carbon effectively adsorbs harmful gases like formaldehyde and eliminates odors. Compared to ordinary filters, it offers better performance.
**Advantages:** Dual filtration, moisture resistance, and odor removal.
**Disadvantages:** Reduced airflow and inability to filter PM2.5 particles.
**3. HEPA Filter**
HEPA stands for High Efficiency Particulate Air. These filters are designed to capture 99.97% of 0.3-micron particles, making them highly effective at filtering PM2.5. They are commonly used in air purifiers but are limited in their ability to remove harmful gases like formaldehyde.
**Advantages:** Excellent at filtering PM2.5 particles.
**Disadvantages:** Poor performance in removing harmful gases.
**4. HEPA Filter + Activated Carbon Layer**
This is a composite filter combining HEPA and activated carbon. It first filters out particulate matter using HEPA, then removes harmful gases through the activated carbon layer. This dual-layer system offers comprehensive protection.
**Advantages:** Multi-stage filtration, effective at removing both PM2.5 and harmful gases.
**Disadvantages:** Higher resistance and reduced airflow.
Among these options, the HEPA + activated carbon combination is the most effective for overall air purification. Only a few mid-to-high-end models use this type of filter. Notably, the new Geely Emgrand features a professional-grade PM2.5 filter with four layers of activated carbon and HEPA paper, capable of eliminating formaldehyde, benzene, and other harmful substances. It filters particles above PM2.5 with 97% efficiency. Additionally, it incorporates plasma sterilization and negative ion technology to ensure clean, fresh air inside the vehicle.
With smog becoming a growing concern, it’s time to consider replacing your car’s air conditioning filter to protect your family and yourself from harmful pollutants.
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