Here is a EPA reference for pollution from nonroad compression ignition engines.
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P100OA05.pdf
A Yamaha gas golf cart has an 11.4 HP engine which would equate to about 8.5 KW. Based on this table using the row for 8 to 19 KW engines, you would expect to see:
56.1 g/hr of CO,
63.75g/hr of NOx, and
3.4g/hr of particulate matter.
This is for new engines which are in excellent running order. Engines that are not tuned properly or have substantial wear will have different numbers. None of this talks about unburned hydrocarbons of which a good bit is benzene.
Hope this helps.