Nitrogen dioxide (NO2) is the main air pollutant from motor vehicle exhaust. Prolonged exposure to the high concentration of nitrogen dioxide can cause respiratory problems. CAN is going to launch an air monitoring program “NO2 Diffusion Tube Action” in Sham Shui Po district in October. It aims to collect street air sample and find out the roadside pollution level. We are recruiting volunteers to help us put the tubes in different locations.