In the directive 2004/107/EC (Fourth Daughter Directive), the EU has set a target value for polycyclic aromatic hydrocarbons (PAH) for the protection of human health; the target is defined in terms of concentration of benzo(a)pyrene (BaP) which is used as a marker substance for PAHs generally: the BaP annual mean value may not exceed 1 nanogram per cubic metre (ng/m3). The target value enters into force 31.12.2012.
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in your garden or park by piling up some logs in a secluded corner. These will provide shelter for hedgehogs, frogs and toads. If you half-bury the bottom logs in the soil, you will also encourage stag beetles as they are fond of rotten wood. A pile of stones will also provide shelter to a range of insects and spiders.
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