Where is the car PM2.5 filter located?

[PaisleeMarie]

Car PM2.5 filters are divided into two types: built-in and external. The built-in type is integrated into the car's air conditioning system, while the external type is integrated into the front center armrest. Additional relevant information is as follows: 1. Filtration function: PM2.5 refers to particulate matter in the atmosphere with a diameter of 2.5 microns or less (less than 1/20th the thickness of a human hair), which can be inhaled into the lungs and poses significant harm to human health, especially for sensitive individuals. The PM2.5 filter helps remove these particles from the air. 2. Impact of PM2.5: PM2.5, also known as fine particulate matter, can remain suspended in the air for extended periods. Higher PM2.5 levels indicate more severe air pollution. Compared to larger atmospheric particles, PM2.5 has a smaller size, larger surface area, higher reactivity, and often carries toxic substances (such as heavy metals and microorganisms). It also remains in the atmosphere longer and travels farther, significantly impacting human health.