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4. Import issues
Import is the proportion of a pollutant's concentration that does not originate from local sources close to the measurement point. The pollution was produced upstream of the zone and then transported by the movement of air masses.
Import concerns all pollutants with a sufficiently long lifespan to be transported. The longer the lifetime, the larger the area affected by the pollution (regional, national or even continental). Typically, ozone and particulate matter, especially the lightest fractions of the latter known as "ultrafine" (size less than a tenth of a micron), are affected by this phenomenon.
4.1 Particles
In 2011, Airparif published a report on the origin of particulate matter in the Paris Region.
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Import issues
Effect of technological scenarios on air quality in 2025
Bibliography
Websites
Air quality factsheets – Ministère de la Transition écologique et solidaire :
Green Deal – European Commission:...
Regulations
EU, 1996, Directive 1996/62/EC of 27 September 1996 on ambient air quality assessment and management
https://eur-lex.europa.eu/eli/dir/1996/62/oj
Loi LAURE, law no. 96-1236 of December 30, 1996 on air and the rational use of energy. JORF n° 0001 of January 1, 1997 page 11
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