Emissions of air pollutants have decreased, except for NH3 and N2O, in the EU-27 in recent decades, because of policy efforts across several transport modes. Reductions in the road transport sector account for the greatest share of this progress, while emissions from the shipping and aviation sectors increased with some pollutants. The dramatic reduction in transport volumes linked to the onset of COVID-19 pandemic led to significant reductions in emissions for the year 2020, but this effect is likely to be temporary. (Source: EEA)