Page 13 - Case study: Fine dust filtration in Stuttgart, Germany

2.3. Results

Results of initial on-site measurement campaigns

The initial assessments of the project indicate that the Filter Cubes make a considerable
contribution towards the reduction of local particle concentration by 10% to 30%, which
corresponds to 40% of all fine dust particles caused by heavy traffic at the road junction. The
positive initial results regarding the fine dust filtration are similar for the effectiveness of the
technology to reduce NO concentrations. This has been verified by the results of simulations
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carried out by an independent engineering office.

The filter removes 80% of fine dust from the surrounding air drawn in, with very low energy
requirements. All 17 Filter Cubes together has reduced the local particle concentration by 10% to
30%, according to the results so far.

The Filter Cubes at the Neckartor junction will be adapted to include the new technology by the
summer of 2019. In the future, they will be equipped with the newly developed combifilter medium
which will enable the filters to retain particulate matter and also adsorb NO2 from the ambient air.
With the updated combifilter mediums, it is expected that the local concentration of NO2 to be
reduced by 10% to 30%. That in turn corresponds to 40% of all NO and fine dust emissions caused
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by road traffic.

Results of additional on-site measurement campaigns

Procedure:

• 7 days of measurements under scientific supervision of Prof. Dittler, KIT, Karlsruhe.

• Utilization of high quality scattered light measurement devices

Main findings:

• Fine dust reduction was observed across the whole investigated area

• The reduction potential declined with increasing distance from the columns.

o At the public measurement station, lower reduction values were measured than along
the walkways. This is a consequence of the comparatively large gap in the net of columns
stipulated by the contracting authority.

o In the proximity of the filter columns, reductions of >30% were found

Fine dust filtration - Stuttgart, Germany 7