(a)

the flow around the sampling point inlet shall be unrestricted (in general free in an arc of at least 270o, or, for sampling points at the building line, of at least 180o) without any obstructions affecting the airflow in the vicinity of the inlet (at least 1,5 m away from buildings, balconies, trees and other obstacles, and at least 0,5 m from the nearest building in the case of sampling points representing air quality at the building line);

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Source: EUR-Lex (Cellar) · retrieved 2026-10-16 · Text as adopted (Official Journal); later amendments are not incorporated in this text.