In the air quality directive (2008/EC/50), the EU has set two limit values for sulphur dioxide (SO2) for the protection of vegetation within the zones designated by member states: the SO2 annual mean value may not exceed 20 micrograms per cubic metre (µg/m3) and the SO2 mean value for the winter period (1 October to 31 March) may not exceed 20 micrograms per cubic metre (µg/m3).
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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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