Over the years 1996-2004 the total population, for which exposure estimates are made, increased from 60 to 125 million people due to an increasing number of monitoring stations reporting air quality data
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Data prior to 1996 with a coverage of less than 50 million people are not representative for the European situation. Year-to-year variations in exposure classes are partly caused by changes in spatial coverage. Only urban background stations have been included in the calculations.
This will reduce wear and tear on them and increase their longevity, thereby saving money. It also saves precious raw material: it takes 27 litres of crude oil to produce a new tire. Under-inflated tyres also increase fuel consumption by up to 10%. Check your tyres at least once a month. It takes but a few minutes.
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