Paris Transport and Travel 2007 Report - (Page 51)

ATMO air quality index in the greater Paris area ATMO index: Defined nationally by the Order dated 22 July 2004 of the Ministry for Ecology, Energy, Sustainable Development and Regional Development. It is used to characterise air quality by a means of a number between 1 and 10. It takes account of sulphur dioxide, nitrogen dioxide, ozone and suspended particles. The index reflects the poorest air quality with respect to each of these pollutants. As in previous years, ozone was the pollutant most often responsible for the ATMO index, ahead of nitrogen dioxide and PM10 particles. However, owing to a change in the particle measurement method (see particles chapter), this pollutant is responsible for the index more frequently than before. Ozone bears almost exclusive responsibility for pollution levels during the summer months. ATMO index 1 2 3 4 5 6 7 8 9 10 Very good Very good Good Good Average Mediocre Mediocre Poor Poor Very poor Number of days 2006 0 25 177 106 26 16 11 4 0 0 Number of days 2007 0 21 163 89 55 24 7 4 0 2 In the greater Paris area, the ATMO air quality index was rated as mediocre to poor (index 6, 7 or 8) for 35 days in 2007, or 4 days more than in 2006. The good and very good index (4, 3 or 2) prevailed for 273 days in 2007, or 35 days less than in 2006. The maximum index 10 (very poor) was exceptionally reached on 2 consecutive days in 2007, on 23 and 24 December in Paris and in certain sectors of the Ile-de-France region. During the course of these 2 days, in addition to high NO2 levels, particles reached record levels owing to the presence of a strong anticyclone. Index 10 had not been reached since 1998 (1 day). 2001 Nitrogen dioxide NO2 Spatial breakdown of the NO2 nitrogen dioxide annual average In the Ile-de-France region for the years 2006 and 2007 2006 2007 Quality objective AIRPARIF now produces maps showing the background levels, plus the pollution levels in the vicinity of the main roads, the routes of which are clearly visible. The maps illustrate the NO2 annual average in 2006 and 2007 in the Ile-de-France region. There was an overall drop in these levels from 2006 to 2007. 51

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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