Figure 2.

Spatial variability in global ammonia emissions based on JRC/PBL [34] (livestock, fertilizers, biomass burning, fuel consumption) and Riddick et al. [35] (seabirds). Emissions from oceans, humans, pets, natural soils and other wild animals (table 1) are not mapped. High-resolution maps for the UK are given in the electronic supplementary material, figure S1.