Drawing of Miss Lilou
This year, the Annual Climate Conference will take place in Paris, between the 30 November and 11 December 2015.
The COP, abbreviation of COreference of Parties, is a supranational conference on the environment, or more specifically on climate change. This year, she stands in Paris (Cop21 in 2015 => 21th conference; Cop22 and 2016 => 22th conference to be held in Morocco).
And find out what its conclusions have in store for us.
The bets are open… Nothing, according to us because the financial stakes are elsewhere and that the priority is not there…
This week-end, Bordeaux and its surroundings are well off in terms of air to breathe but tomorrow?
Drawing of Wingz
We monitor the air in Aquitaine
AIRAQ, created in 1995, is the association approved by the ministry in charge of ecology for monitoring air quality in Aquitaine (AASQA). She is a member of the Federation Atmo France which follows the evolution of pollutants in the air and inform the general public.
Valérie Doulevant
THE ATMO INDEX
Comment of the day
Friday 4 December : the air quality indices are good on Arcachon, CHAPTER, Bordeaux, Lacq, Pau and middle on Périgueux. Poor indices are noted in Agen and Dax due to higher levels of suspended particles in these agglomerations. Saturday 5 December : in accordance with weather conditions, good to average indices are planned for the Aquitaine region.
The ATMO index : definition and calculation method
The ATMO index characterizes the daily air quality of an agglomeration of more than 100 000 inhabitants on a scale of 1 (very good) at 10 (very bad) depending on the presence of pollutants in the air (including ozone).
For an area of less than 100 000 locals we will talk about simplified air quality indices (IQA). This index does not make it possible to highlight localized phenomena of pollution but a global air pollution.
- Bordeaux Grand Parc stations, Talence, Bassens, Saint-Sulpice and Cameyrac, Ambès and Léognan.
- Pau, of Billère and Pau le Hameau.
- Bayonne, from Bayonne Saint Crouts.
- Lacq, from Lacq, Labastide Cérazacq, Maslacq, Lagor and Mourenx.
- Perigueux, from Périgueux-Picasso.
- Agent, from Agen-Armandie.
- Dax, from Center-de-secours.
Calculation method
The indices of air pollutants are constructed from 4 air pollution indicators for which are calculated 4 under indices :
- sulfur dioxide – SO2
- nitrogen dioxide – NO2
- l’ozone – O3
- fine particles – PM10
The final index is the highest of 4 under indices. Calculated from 0 at 24 h, it is estimated during the day and is the subject of a trend forecast for the next day.
The basic data for the daily calculation of each sub-index are :
- the average of the hourly maximum concentrations observed for sulfur dioxide (SO2), nitrogen dioxide (NO2) and ozone (O3)
- the average of the daily concentrations observed for the particles in suspension (PM10)
Please note that from 1is mars 2015, and as permitted by the ministerial decree of 21 December 2011, SO sub-indices2 are no longer calculated for the agglomerations of Bordeaux, Pau and Bayonne, in view of the low levels observed in recent years. The SO sub-index2 continues to be calculated on the Lacq ZI.
The CITEAIR indices
The CITEAIR index aims to present the air quality in the different European cities in a simple and comparable way. In Aquitaine, you can consult the daily indices for the cities of :
|
Index |
SO2 |
NO2 |
O3 |
PM10 * |
|---|---|---|---|---|
|
1 |
0 at 39 |
0 at 29 |
0 at 29 |
0 at 6 |
|
2 |
40 – 79 |
30 – 54 |
30 – 54 |
07 – 13 |
|
3 |
80 – 119 |
55 – 84 |
55 – 79 |
14 – 20 |
|
4 |
120 – 159 |
85 – 109 |
80 – 104 |
21 – 27 |
|
5 |
160 – 199 |
110 – 134 |
105 – 129 |
28 – 34 |
|
6 |
200 – 249 |
135 – 164 |
130 – 149 |
35 – 41 |
|
7 |
250 – 299 |
165 – 199 |
150 – 179 |
42 – 49 |
|
8 |
300 – 399 |
200 – 274 |
180 – 209 |
50 – 64 |
|
9 |
400 – 499 |
275 – 399 |
210 – 239 |
65 – 79 |
|
10 |
>=500 |
>=400 |
>=240 |
>=80 |
* Scale modified by the order of 21/12/2011 applicable to 01/01/2012.
Stop of 21 December 2011 amending the decree of 22 July 2004 relating to air quality indices.
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The CITEAIR index : definition and calculation method
These indices have 5 levels, with a scale from 0 (very weak) at >100 (very high), this is a relative measure of the amount of pollution in the air. They are based on 3 major pollutants in Europe :
- the particles (PM10),
- nitrogen dioxide (NO2)
- l’ozone (O3)
- and allow to take into account 3 additional pollutants (the CO, SO2 and fine particles (PM2.5)) where data is available.
The calculation of the index is based on a set of air quality indices existing on different websites in Europe and elsewhere.. It reflects as much as possible European alert levels or daily limit values. To better compare cities, regardless of the nature of their surveillance network, two indices have been defined :
- the background index, representing the ambient situation of the agglomeration concerned (from bottom station measurements),
- the traffic index, representative of the situation near streets with heavy traffic (from measurements of stations near traffic).
For more information on the CITEAIR index : www.airqualitynow.eu
