The pies show the proportion of stations on map with low (green), moderate (yellow) and high (red) concentrations in the latest monitoring year for each of the seven hazardous substances. In the case of the three metals the boundary between moderate and high is set using foodstuff limits. The arrow indicates the general trend for each category where one can be identified
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– to verify whether it isn't poisoning the air in your home or consuming too much energy. Have it replaced once every 15 years – to benefit from the technological advances that render new boilers more energy-efficient.
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