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In many of the world’s metropolises, the air is extremely polluted – with serious health consequences for their inhabitants. According to the World Health Organization, around 7 million people die every year worldwide as a result of air pollution. In the meantime, many governments have set themselves the goal of permanently improving air quality in large cities.

Urban traffic plays an important role in this. Whether natural gas, electricity, fuel cells or hydrogen: alternative drive systems are moving into the focus of car developers in order to reduce greenhouse gas emissions in the long term.

Great hopes are pinned on electric mobility and new transport concepts in particular. The inner city of Oslo, for example, is to develop into a car-free zone by 2019 and public transport is to be expanded.

 

In Germany, Munich and Stuttgart are among the dirtiest cities. The latter has already introduced a permanent ban on trucks in 2010. Fine dust alarms have been sounded regularly since 2016. In addition, targeted, intensive street cleaning could make an effective contribution to reducing the local generation of particulate matter on busy streets in large cities. However, the experiment with a moss wall in Stuttgart, which was to absorb fine dust, had little effect – the mosses could also not be kept vital.