Apparently shipping is slightly unusual as it produces a greater than average amount Sulfur Oxide due to bunker fuel's higher sulfur content though it is not considered a greenhouse gas such as in the graph. This is where headlines like "One cargo ship emits as much pollutants as 50 million cars" comes from, though the calculation is debatable.[1]
For comparison gas or diesel is something like 10-15ppm Sulfur in the US now while historically bunker fuel is historically more like 3-5%, though it has been decreasing with regulations. [2]
For comparison gas or diesel is something like 10-15ppm Sulfur in the US now while historically bunker fuel is historically more like 3-5%, though it has been decreasing with regulations. [2]
[1]https://www.cadmatic.com/en/resources/articles/does-one-ship...
[2]https://www.epa.gov/diesel-fuel-standards/diesel-fuel-standa...