Paris Transport and Travel 2007 Report - (Page 54)

Monitoring of four pollutants in the greater Paris area Annual background average (in μg/m3) Nitrogen dioxide NO2 µg/m 3 60 50 40 30 20 10 0 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 56 54 51 49 48 42 42 40 38 44 2007 limit value = 46 µg/m3 Quality objective = 40 µg/m3 For nitrogen dioxide, a steady drop has been recorded since 1999. Only 2003, which experienced exceptional weather, saw an average 10% rise in levels. In 2007, the concentration – which was slightly down on 2006 – fell below the quality objective (40 μg/m3). It is the lowest recorded. Ozone O3 µg/m 3 50 40 30 20 10 0 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 30 40 35 29 33 34 36 35 38 33 There has been a gradual rise in levels over the past ten years. Despite this, the 2007 value is the lowest since 2002, owing to the extremely unusual weather conditions in the summer of 2007, which were not particularly favourable to the formation of high ozone levels. Background situation: Measurement points remote from the sources, representing the general ambient atmosphere. Average annual concentrations: These are obtained from a constant sample of urban background stations in the greater Paris area. Order dated 12 November 2003, adapting the European Parliament's directive dated 12 February 2002 to French law: It defines national quality criteria for each pollutant (quality objective, limit value, alert thresholds, effects on health and the environment). Sulphur dioxide SO2 µg/m 3 50 40 30 20 10 0 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Quality objective = 50 µg/m3 For sulphur dioxide, the levels which were already very low in previous years, were down still further in 2007. The quality objective was met for all measurement stations. 14 12 11 11 10 9 7 6 6 4 PM10 and PM2.5 fine particles µg/m 3 40 PM10 PM2,5 35 30 25 20 15 10 µg/m 3 Change in measurement method (for PM10 and PM2.5) 23 23 14 24 15 24 15 25 16 22 30 24 Annual limit value = 40 µg/m3 (pour PM10) Quality objective = 30 µg/m3 (pour PM10) 40 35 30 A PM10 PM10 PM2.5 PM2,5 levels, on the one hand owing to a change in 25 measurement method and on the other 24 the 24 24 23 23 23 5 25 22 owing to the weather conditions in April21 and 21 0 December, when high particle levels were 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 20 16 15 15 observed. The resulting increase led to the 14 14 as average value for the Paris area rising as high as the quality objective (30 μg/m3),14 recorded by the two 15 13 Paris stations. The10 is similar for PM2.5 (not yet regulated). trend 13 Change in 21 measurement method 23 21 For PM10 particles, following a period of (forstability inand PM2.5)2007 saw 30 in PM10 previous years, a rise 14 14 Q 5 0 54

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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