preamble_140

Council Directive 85/203/EEC of 7 March 1985 on air quality standards for nitrogen dioxide · European Union

4. The sampling head entry must be protected against rain and insects. If a pre-filter is used, it should be selected and maintained (regular cleaning) so as to minimize its influence on the NO2 concentration.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.