The measurement was carried out using a simple measuring device: participants attached (glued) an estate agent panel to the outside of a window, with two measuring tubes in the ‘nose’ of the panel. This panel was left in place for 4 weeks in October 2021. On the last day of the measurements, Saturday 23 October 2021, the two measuring tubes were taken back to a DPD collection point. The tubes were then analysed in the laboratory. The results will be published on 18 March 2022.
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