European institutions agreed last week to tighten the concentration limits in the air for the main pollutants. In several cases, it means halving the maximums compared to what has been allowed until now.
The countries of the European Union will have to catch up in the next six years, because they will be mandatory from 2030. Only 4 of the 20 most populated cities currently respect the limit for nitrogen dioxide agreed by the EU for 2030. All of them exceed maximums in the case of fine particles less than 2.5 microns.