Bars represent average annual concentrations over a limited number of monitoring stations along busy roads in major European cities (Vienna, Prague, Paris, Berlin, Athens, Krakow, Bratislava, Stockholm and London NOX, and Prague, Copenhagen, Berlin, Reykjavik, Rome, Bratislava, Stockholm and London PM10), error bars represent the highest annual concentration measured at one single monitoring station
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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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