I am a medical researcher working on treatments for brain injured babies. However, my interest in air pollution is where I live in Oslo. When the weather is cold, many people round me heat their homes with wood-burning stoves. This hugely increases 2.5 m particles in the air outside if there is no wind. In addition, we live right by the sea and have a steady traffic of diesel-powered ships and ferries passing quite near and these probably contribute to particle pollution unless the wind is blowing.