The role of N-gases (N2O, NOx, NH3) in cost-effective strategies to reduce greenhouse gas emissions and air pollution in Europe

► Quantitative results on damage and abatement costs of N pollution are available ► NH3 abatement is the top cost-effective measure for low ambition policy. ► Reducing NOx is the most efficient strategy at higher costs. ► N2O mitigation is cost efficient but offers limited potential compared to CO2. ► Air pollutant-greenhouse gas interactions remain to be a challenge.