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Over the years 1997-2002 the total population for which exposure estimates are made, increases from 34 to 106 million people due to an increasing number of monitoring station reporting air quality data. Year-to-year variations in exposure classes are partly caused by the changes in spatial coverage.
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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