Its not a stupid question, but one which has generated a lot of research.
I haven't seen the exact numbers, but I believe its cleaner than diesel now, mostly through cat convertors, catalysts and lower temps.
"MAN said it also cuts NOx emissions by 40% compared with fuel oil"
https://www.lloydslist.com/LL1148963/MAN-claims-its-ammonia-engines-N20-emissions-are-extremely-low
https://pubs.acs.org/doi/10.1021/acsenergylett.3c01256
Also lots of research in the hydrogen space
https://fuelcellsworks.com/2024/10/11/clean-energy/ucr-scientists-cut-harmful-pollution-from-hydrogen-engines
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