The ongoing pollution measurements have shown that the air quality in the areas of the cities of Heidenheim, Heilbronn, Herrenberg and in the area of the regional environmental zone Leonberg/Hemmingen has improved significantly in recent years. The emission concentrations of nitrogen dioxide are now well below the annual average limit of 40 µg/m³. The limit values for fine dust PM10 have been observed across the board in Baden-Württemberg since 2018.

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