This of course relates to nitrogen holding compounds such as ammonia, other sources (in the form of nitrogen oxides) are road and airplane engines as well as construction and heavy industries. These nitrogen compounds actually have an acute negative impact on population health through respitory tract damage as well as on wildlife as well as certain types of plants, which leads to a reduction in biodiversity. That's the reason for EU wide nitrogen compound emmission caps. Just to be clear, the Netherlands has an extremely high concentration of livestock farmers. About 75% of meat production is exported even though we're an extremely small country with a super high population and structure density..