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ntr3-L_202402881EN.004701-E0003

(3) The threshold shall be set to 4, 3, 10, 3 and 5 μg/m3 for PM10, PM2,5, O3, NO2 and SO2, respectively, and 0,5 mg/m3 for CO. These values represent the state of knowledge and shall be regularly updated at least every 5 years, to reflect developments in the state of the art.

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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.