In the air quality directive (2008/EC/50), the EU has set a target value and a long term objective value for ozone (O3) for the protection of human health. Target value: the maximum daily eight-hour mean may not exceed 120 micrograms per cubic metre (µg/m3) on more than 25 days per calendar year averaged over three years. Long term objective value: the maximum daily eight-hour mean may not exceed 120 micrograms per cubic metre (µg/m3) within a calendar year.
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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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