Driftåtgärder mot PM10 i Stockholm: utvärdering av vintersäsongen 2014–2015

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Sara Janhäll
Michael Norman
Christer Johansson

Since 2011, intensified efforts are made to reduce the levels of PM10 in Stockholm. This report presents results and evaluation of the efforts made during the winter season 2014–2015. The season has the lowest PM10 concentrations and the lowest number of exceedances of the environmental quality standard for PM10 since measurements started in Stockholm in 2000. Calculations using the NORTRIP model shows that both increased dust binding, reduced use of studded tires, lower background concentration and differences in meteorology are all factors that contributed to reduced levels from 2013 to 2015. Treatment with CMA + KF (potassium formate) did not appear to give any impact on PM10 levels, while block-wise dust binding gave an additional, but not significant, positive effect.

The dust load on the road surface has a declining trend in all streets except Hornsgatan over the past three years and has, as in previous seasons, a seasonal variation with large amounts in winter and early spring and low in October and May. Detailed measurements showed a strong variation in the dust load across streets, with large accumulations outside the driving lane. Road surface texture is considered to play an important role in the accumulation of dust as it affects both the suspension from traffic, as well as the ability to clean off the dust. The report provides, based on the season’s results, combined with data on measures and meteorology, some suggestions for how measures can be improved and also provides examples of how additional needs or unnecessary efforts can be retrieved from the existing data.

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