Paris Transport and Travel 2007 Report - (Page 53)

PM10 particles On 1 January 2007, there was a change in the method used to measure PM10 and PM2.5 particles throughout France. This enables the volatile fraction of these particles to be taken into account. Consequently the measurement results are higher than those obtained with the old method. Annual average for PM10 particles for all Paris stations, according to typology (urban and traffic) for the year 2007 Quality objective: 30 g/m3 Paris 18th Paris 1st les Halles Avenue des Champs-Elysées Place Victor Basch Auteuil – Paris ring road 30 30 Limit value: 40 g/m3 43 45 50 0 5 10 15 20 25 30 35 40 45 50 TRAFFIC STATIONS (roadside) URBAN STATIONS (background) The two Paris background stations measuring PM10 particles each gave an annual average of 30 μg/m3. This value is equal to that of the quality objective (30 μg/m3), which was therefore not met in 2007. However, the annual limit value (40 μg/m3) was met by the background stations. The three roadside stations showed levels far higher than the quality objective and higher than the limit value (40 μg/m3). The levels recorded by the traffic stations are about 1.5 times higher than those from the background urban stations. Changes in average concentration of PM10 and PM2.5 particles from the traffic station on the Paris ring road at Auteuil µg/m3 70 60 50 40 30 50 47 Change in measurement method 43 44 43 46 50 41 42 42 PM10 particles: Although particle levels have been relatively stable since 2000, an increase was observed in 2007, due both to the change in measurement method and to the particular weather that year. The annual limit value and the quality objective were exceeded. PM10 particles: Suspended particles with a mean aerodynamic diameter of less than 10 microns. PM2.5 particles : Suspended particles with a mean aerodynamic diameter of less than 2.5 microns. 20 10 0 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 µg/m3 70 60 50 40 30 20 10 0 33 32 PM2.5 particles: Change in measurement method The trend is similar for PM2.5 particles, which are not yet regulated. 33 27 29 29 29 26 27 1999 2000 2001 2002 2003 2004 2005 2006 2007 53

Table of Contents for the Digital Edition of Paris Transport and Travel 2007 Report

Cover
Contents
Journeys in the Paris region
Public transport
Travel by bicycle
Pedestrians on the move
Journeys made by people with reduced mobility
Traffic
Travel by motorcycle
Parking
Journeys by taxi
Journeys made by tourists
The carriage of goods
Travel safety
Planning public space
Atmospheric pollution
Economic backdrop
Key figures for 2007
The Observatoire des déplacements (Paris transport  monitoring center)

Paris Transport and Travel 2007 Report

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