Numerical Study on Reduction of Ambient NOx, PM, and VOCs Concentrations by ACF (Activated Carbon Fiber) Fences: Effects of Generated Air Flow and Chemical Reactivity of the ACF Fences

A method to use fences of activated carbon fiber (ACF) is presented to reduce high NO2, PM, and VOCs concentrations in urban atmosphere without excess energy use. Polluted air in road space moves with natural and car-induced winds to contact with and to flow through ACF fences, and the ACF layer removes these pollutants. That this “energy-free” equipment can reduce high NOx by 15–50 % at the roadside is numerically evaluated.