The type of particles that are a major problem in other parts of Europe are not found in Umeå, but here there are studded tire particles and in addition there is often stagnant air which means that carbon dioxide emissions in the central parts top Sweden's major cities.

 - At the same time, we are both the worst and the best depending on which parameter is used, says the environmental inspector.

Listen to Joakim Linder in the clip above.