Dr. Jenny Deakin:

This graph is a plot of the nitrogen concentrations. We have five regions. The different concentrations in each region can be seen. The data points are averaged for each year for each region and nationally. The dotted coloured lines show the levels where the nitrogen concentrations need to be for different purposes. The blue line is to achieve the standards to support high water quality. The green line is the needed standard to support good water quality, where we have a good status objective. The yellow line is what we need to support good water quality in a marine environment.