In the colder months of the year, you often see very dense, smoky streets, which are of course caused more by the heating than the traffic itself. Interestingly, taxes are only levied on vehicular pollution, while houses and blocks of flats with heating stoves are not taxed and have no particulate filters, nor are there any rules on what material can be used for stoves. If the problem is approached holistically, the stigmatisation of vehicles as the main polluters is almost pathetic, except in large cities where there are heating plants. Where is the logic?