Isolignes de concentration

Sur une carte géographique, des isolignes de concentration sont des lignes reliant des points de même concentration de polluants.

Traçage des isolignes de concentration

Dans le domaine de la surveillance de la qualité de l'air ambiant, des campagnes de mesures d'un polluant, à l'aide de nombreux tubes passifs[1], donnent les résultats des concentrations moyennes pour la période d'étude (une à deux semaines en général).

Ces concentrations moyennes mesurées, convenablement réparties sur la zone géographique concernée, permettent si on dispose d'un logiciel adapté, de tracer des isolignes de concentration, c'est-à-dire des lignes reliant les points d'égale concentration (c'est l'équivalent des courbes de niveau pour les concentrations de polluants).

Note

  1. ↑ Le tube passif a l'avantage d'être de faible dimension, de ne demander aucune alimentation électrique, d'être peu dispendieux, et par conséquent de pouvoir être implanté en grand nombre sur une zone déterminée.

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