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Air quality deteriorates after Christmas

After an extraordinary air quality during the weekend of the Fourth Advent, the air deteriorated over Christmas. In Rhône-Alpes, Hauts-de-France and Alsace, red (bad) values are displayed on air quality maps. Where does this change come from? Would the French have heated more with stoves during Christmas? Or, would they have used the car more to go to their families?  In any case, it is advisable to monitor the values for the following days since a sustained pollution peak could lead to traffic restrictions.