Still, it's a scary thought. We all think we are keeping fit and healthy by cycling to work yet we are exposing ourselves to dangerous levels of carbon monoxide. I often find myself holding my breath each time a bus passes me (which is hardly ever 'cause they are like so slow :P)I tried wearing a Respro mask once and nearly passed out from the restricted airflow. It's just something we have to live with and hope that one day petrol and diesel cars are banned within central London :)
Original article here: http://www.theatlanticcities.com/commute/2011/09/bikers-lung/195/
