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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.
Home gardens can add immensely to the biodiversity of cities and towns.
They provide cover, feeding and commuting routes for wildlife including hedgehogs, badgers, birds and butterflies. If you have a garden, increase its value by planting berry-bearing trees and flowering plants. Rowan, bird cherry and dandelion, among others, can serve as food and shelter to a wide range of invertebrates.
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