In the center of Uppsala there are two measuring stations set up to measure the levels of nitrogen dioxide. One of them sits on Kungsgatan at ground level and the other on a roof at Dragarbrunnstorg. The one on Kungsgatan shows a reduction of 20-30 per cent of the nitrogen dioxide levels when compared to April this year compared to the same month for the past three years. The other measuring station also shows similar results.
See the clip above to find out what Olof Öhlund, inspector at the environmental administration in Uppsala municipality, says the improved levels are due to.