Driftåtgärder mot PM10 på Hornsgatan och Sveavägen i Stockholm: utvärdering av vintersäsongen 2011–2012

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Christer Johansson
Michael Norman

Several Swedish cities have problems with complying with the environmental quality standard for inhalable particulate matter in air (PM10). Stockholm has a number of problematic traffic environments with narrow street canyons and high traffic flows, where the limit values are exceeded practically every year. An important source for PM10 is road dust forming from wear of road pavements and use of winter sanding. Different measures have been tested to mitigate the particle concentrations but to reach the limit values, no single measure is enough, but needs to be combined. During the winter 2011–2012, the city of Stockholm has tested a combination of measures, including dust binding with CMA, powerful street sweeping and street flushing with water to, if possible, reach the PM10 limit values. During the season, 31 applications of CMA, 25 road sweepings and 42 road flushes, were conducted. The results show that the number of PM10 directive exceedances on both streets were considerably fewer than on the reference streets. The single measure having a significant effect, though, was dust binding with CMA, while sweeping and flushing did not reduce PM10 concentrations. The road dust depot increased during the winter months on the test streets and reached a maximum in March, during the most intense dust binding efforts. An obvious relationship between road surface texture and road dust depot could be identified. The ion content on the street surfaces reflected the use of road salt (NaCl) and CMA

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