NH₃ (Ammonia) Slip

Unburned ammonia from NH₃-fuelled engines. Ammonia is toxic and forms secondary PM; slip management is the headline safety challenge for ammonia marine propulsion.

PollutantsAmmonia fuel

Engine powerkWAnnual hourshNH₃ slipg/kWhCurrent early-2-stroke designs target ≤ 1.5 g/kWh. Future SCR-coupled designs aim for < 0.3 g/kWh.

Annual NH₃

72.00t

High. Consider SCR-integrated aftertreatment.

Why it matters

Ammonia itself isn't a GHG but it is (a) acutely toxic - immediately dangerous to life and health at 300 ppm - and (b) a precursor to secondary PM and N₂O formation when processed by SCR at low temperature. Regulatory focus is on exhaust stack ppm limits and engine-room fugitive emissions.

The N₂O calculator handles the GWP-heavy nitrous-oxide co-product separately.