Nutrients like nitrogen, phosphorus, and potassium are  a double-edged sword . As key components of fertilizers, they are  essential for life on Earth, but become a threat to human health and the environment when they are in excess and run off into water courses and wastewater.

As part of the Green Deal presented by the EU Commission last year, the bloc now proposes raising emissions-reduction targets to 55% of 1990 levels, with a 40% cut in greenhouse gases over the same period.

Anthropogenic emissions have, until now, been collected, but not harmonised . These consist, for example, of data of nitrogen oxides (NOx) emissions, smog, methane, CO 2 and even pollen and dust produced, among others by heavy industry and power plants.

Poor air quality costs Europe more than €700 million per year, in health expenditures and loss of economic performance, according to official EU sources.

Going green is one of the fastest growing trends, particularly in industry. But smaller size companies are often left wondering how best to become more environmentally friendly .

From 13th to 16th September 13 to 16 Barcelona hosted the 2011 ISEE (International Society for Environmental Epidemiology) congress.