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In the air quality directive (2008/EC/50) the EU has set two limit values for sulphur dioxide (SO2) for the protection of human health: the SO2 hourly mean value may not exceed 350 micrograms per cubic metre (µg/m3) more than 24 times in a year and the SO2 daily mean value may not exceed 125 micrograms per cubic metre (µg/m3) more than 3 times in a year.
Blue = good, red = not good, green = other and grey = unknown). The figures in parenthesis are the number of reported features. The associated confidence rating of the information is rarely high.
For references, please go to https://www.eea.europa.eu/data-and-maps/find/global or scan the QR code.
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