In its latest quarterly analysis, VesselBot analyses 73,353 container ship voyages completed by 4,750 vessels between July and September 2025, revealing that total container ship emissions reached 50.3 million tons in Q3
In its latest quarterly analysis, VesselBot analyses 73,353 container ship voyages completed by 4,750 vessels between July and September 2025, revealing that total container ship emissions reached 50.3 million tons in Q3 2025, remaining virtually unchanged (-0.2%) compared to Q3 2024 despite a 2.3% increase in voyages.
Average well-to-wake emissions intensity improved to 195.9 g CO2e/TEU km, down 1.6% year-over-year, driven by longer steaming times and reduced port dwell times.
Direct China-U.S. voyages showed pronounced volatility, declining 3% in the first nine months of 2025 but spiking 15% in July before dropping 10% in September. China's retaliatory port fees targeting U.S.-owned, operated, or built vessels introduce additional complexity to carrier deployment strategies.
Chinese-built vessels completed 36% of Q3 voyages, while 53.1% of vessels under five years old have been built from Chinese shipyards. South Korean-built vessels carried out 24.6% of all Q3 containership voyages, but 41.3% of all VLCS. South Korean built vessels' voyages recorded the lowest emissions intensity at 152.7 g CO2e/TEU km due to larger capacities and long-haul trade deployment.
Well-to-wake emissions intensity varies dramatically by vessel size, from 252.1 g CO2e/TEU km for feeder vessels (up to 2,999 TEU capacity) to 61.4 for very
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