The Government of Canada’s terminology and linguistic data bank.


Record 1 2002-02-27


Subject field(s)
  • Air Pollution
  • Atmospheric Physics

The top of the mixing layer can be estimated from Portelli's (1977) climatology for Canada. The distance downwind where the top of the plume intersects this "lid" is quite variable. Similarly the point downwind where the plume from an elevated source reaches its maximum ground-level concentration will depend on several factors.


  • Pollution de l'air
  • Physique de l'atmosphère

Les polluants se trouvent alors freinés dans leur ascension et en quelque sorte bloqués sous une "couche d'inversion" qui joue le rôle d'un véritable couvercle thermique. Si, au même moment, il n'y a pas de vent, les polluants s'accumulent et les teneurs au sol augmentent dans des proportions importantes.


Campo(s) temático(s)
  • Contaminación del aire
  • Física de la atmósfera
Save record 1

Copyright notice for the TERMIUM Plus® data bank

© Public Works and Government Services Canada, 2018
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau


Language Portal of Canada

Access a collection of Canadian resources on all aspects of English and French, including quizzes.

Writing tools

A collection of writing tools that cover the many facets of English and French grammar, style and usage.

Glossaries and vocabularies

Access Translation Bureau glossaries and vocabularies.

Date modified: