In the air quality directive (2008/EC/50) the EU has set two limit values for sulphur dioxide (SO2) for the protection of human health: the SO2 hourly mean value may not exceed 350 micrograms per cubic metre (µg/m3) more than 24 times in a year and the SO2 daily mean value may not exceed 125 micrograms per cubic metre (µg/m3) more than 3 times in a year.
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It will keep weeds away; protect the plants by keeping the soil cool; decrease evaporation and reduce soil compaction. Be creative and use materials like: pebbles, bark chippings, gravel, cocoa shells, decorative pine cones, marbles, broken crockery, grass clippings or leaf mould. But avoid mulching too close to the stems to avoid the plant rotting in winter.
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