No clean city

Doing nothing about the level of air pollution in our cities is not on the list of options. Glasgow's Renfield, Hope and Union streets now compete for the unenviable title of the most polluted thoroughfares in Britain, largely due to the number of buses that continue to clog them from dawn until after dusk. Though theoretically forbidden from idling, some operators appear to use bus stops like hackney ranks. Under certain weather conditions, the combination of poorly phased traffic lights and sheer volume of traffic competing for custom on the most profitable routes is a recipe for almost unbreathable air.