With   the continuous construction and improvement of urban subways, rail transit   has brought convenience to people's lives. However, due to the relatively   closed subway stations and carriages and the high density of people, there   are a large number of harmful particles in the subway air, such as coal,   asphalt, iron, etc., which are mainly produced by incomplete combustion of   fuel and wheel friction. These ultrafine metal dust particles can enter the   blood vessels through the lung tissues, posing a threat to health.
   
    Studies have shown that high-efficiency commercial air filters can   effectively reduce harmful particles in the subway air. Below we show you the   cases and studies we participated in, in order to find the perfect solution   for you to purify the air environment of rail transit.