All stations in EU Member States, with at least 75 % data coverage for at least eight years (PM10) or six years (PM2.5), were included in the analysis. Concentrations per station type are given in μg/m3. In the diagrams a geographical bias exists towards central Europe where there is a higher density of stations.
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In 2006, France introduced a nation-wide system to correct PM10 measurements. French PM10 data prior to 2007 have been corrected using station-type dependent factors.(de Leeuw, F. and Fiala, J., 2009, Indicators on Urban Air Quality, A review of current methodologies, ETC/ACC Technical Paper 2009/8)
This will reduce wear and tear on them and increase their longevity, thereby saving money. It also saves precious raw material: it takes 27 litres of crude oil to produce a new tire. Under-inflated tyres also increase fuel consumption by up to 10%. Check your tyres at least once a month. It takes but a few minutes.
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