Nitrogen oxide emissions in the European Union (EU-28) 2000-2018, by sector

Nitrogen oxide emissions in the European Union have fallen significantly across most sectors over the past few decades. In 1990, the transport sector emitted 8.6 million metric tons of nitrogen oxides. By 20198, this had fallen to 3.4 million metric tons. Despite this reductions, transport is still the main contributor to nitrogen oxide emissions in the EU. This is followed by the energy supply sector, which emitted 1.1 million metric tons in 2018, which was a 70 percent reduction from 1990. Nitrogen Oxides are a group of gases composed of nitrogen and oxygen, and includes nitrogen dioxide.