Fig. 1: Global NH3 emissions from 1980 to 2020.
From: Halving global ammonia emissions with cost-effective measures
a, NH3 emissions by sector during 1980–2020. b, NH3 emission flows among sector, region and income group in 2020. c,d, spatial patterns of NH3 emission density in 1980 (c) and 2020 (d). Detailed country classification can be found in Supplementary Table 1. Maps were created based on the integration of CHANS emission inventory and EDGAR annual grid maps with 0.5 × 0.5 degree resolution. UMI, upper-middle income; LMI, lower-middle income; HI, high income; LI, low income. Basemaps in c and d are sourced from GADM (https://gadm.org/).
