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. 2019 Nov 13;5(11):eaax9800. doi: 10.1126/sciadv.aax9800

Fig. 4. NOx emissions over the South African Highveld.

Fig. 4

(A) Top-down emissions E averaged for December 2017 to October 2018. Gray lines show motorways and trunk roads. Symbols mark city centers (o), PPs (Δ), and a synthetic fuel plant (□). (B) Fitted point sources Eps. See table S2 for point source locations, references, and derived emissions.