The map shows stations with a statistically significant decrease (green), increase (red) or no trend (yellow) in winter oxidised nitrogen concentrations within the period 1985-2010. Selected stations must have at least data in the period from 2007 to present and at least 5 years data in all.
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Decrease your toilet’s water-use by dropping a hippo or other displacement device into the cistern. If you’re planning on buying a new toilet, consider a water efficient one with a dual flush.
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