Reduction of livestock numbers (especially cattle and pigs) has cut the use of manure in fertilisation. However, in some regions, agriculture run-off pollution is a concern, especially in western Slovakia, as there has been a rise in surpluses of nitrogen (but not phosphorus) as a result of a growing use of nitrogenous fertiliser since 1999 (OECD, 2008). The increase, which accelerated in 2008, will translate into increased pollution of surface water and groundwater in some intensively farmed areas.