Sulfur
The average sulfur content of diesel samples from 2013 to 2018 is shown in the figures below.
All the samples were within the allowed limits of the specifications, except one sample of diesel 50 ppm in Swaziland in 2014, which had 385 ppm sulfur.
Sulfur content of diesel 500 ppm sulfur samples
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Source: SGS Worldwide Fuel Survey and Joint Venture, 2019
Sulfur content of diesel 50 ppm sulfur samples
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Source: SGS Worldwide Fuel Survey and Joint Venture, 2019