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Smog Eating Street Reduces Air Pollution

Published: Monday, July 08, 2013
Last Updated: Monday, July 08, 2013
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Titanium oxide (TiO2) used to remove chemical pollutants from the air.

Urban smog and its harmful effects on health and the environment may be a thing of the past following a full-scale test of a chemically engineered air-purifying pavement in The Netherlands.

The experiment, which was conducted over a one year period, managed to reduce nitrogen oxide (NOx) air pollution by up to nearly half (45 per cent) in ideal weather conditions and by nearly a fifth (19 per cent) over the duration of a whole day.

The findings have been published by Eindhoven University of Technology who undertook the research in two adjacent streets in Hengelo, eastern Netherlands.

The experiment involved monitoring air pollution in a ‘control street’ with normal paving blocks covering approximately 100m in length.

A second street was installed with a 150m long ‘photocatalytic’ pavement and both streets were measured for levels of NOx - the name given to a group of highly reactive gases responsible for air pollution, with car emissions a major cause in urban areas.

The potential of ‘photocatalytic’ surfaces to reduce air pollution have been known for several years. This latest experiment used titanium oxide (TiO2), which can be easily sprayed onto surfaces, and has the ability to remove chemical pollutants from the air and turn them into less harmful chemicals such as nitrates.

David Brown, chief executive of the Institution of Chemical Engineers (IChemE), said: “In recent weeks we have seen the difficulties smog can cause in cities like Singapore.
“Preventing air pollution is clearly important to our long-term health and environmental protection, but this latest research shows the potential of chemically engineered surfaces to further improve our quality of life, especially in major urban areas where traffic emissions are high.

Brown continued, “Further studies of this nature are needed to assess and improve the potential of other photocatalytic materials and in different environments. However, the potential is there and gives a strong indication of how streets may be designed in the future.”

IChemE’s technical strategy, Chemical Engineering Matters, outlines the contribution chemical engineers are making to a range of issues to improve the quality of life including food, water, energy and health.


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