Every fleet conversation about decarbonisation eventually hits the same question: how big is the problem, actually? The Department for Transport publishes the answer annually in its transport and environment statistics, and the latest edition gives the industry its working numbers - the ones that appear in government policy, customer carbon questionnaires and tender documents.
The 2024 statistics put domestic transport’s greenhouse gas output at 110.4 million tonnes of carbon dioxide equivalent (MtCO2e) - essentially flat against 2023, a 0.2% increase from 110.2 MtCO2e, and a decrease of 10% compared to pre-pandemic levels in 2019. In share-of-the-problem terms, domestic transport accounted for 30% of total domestic greenhouse gas emissions in the UK. On air quality, transport was responsible for 29% of domestic nitrogen oxides (NOx) emissions.
Three of those numbers deserve a second look. The 30% share makes transport the largest-emitting sector of the UK economy - the position it has held since power generation decarbonised around it. That is why every net-zero policy document starts with transport: it is where the emissions are. The 0.2% uptick matters in the other direction: after the pandemic-era drop, transport emissions have stopped falling and are tracking sideways - the easy reductions are behind us, and the trend line is the policy problem. And the 29% NOx share is why urban air quality rules - clean air zones, low emission zones, direct vision and the rest - keep landing on road vehicles specifically.
The DfT statistics series breaks the total down by mode - cars, vans, HGVs, buses, rail, domestic aviation and shipping - using the detailed transport energy and environment data tables that underpin the headline release. For freight operators the relevant story is the persistent one: heavy goods vehicles are a small share of the vehicle fleet but a significant share of road transport emissions, because a 44-tonne artic burns fuel at a rate no car approaches. Vans are the growth story - the fastest-growing traffic segment, and the one where electrification is moving quickest.
The statistics also track the fleet’s composition over time: how many licensed vehicles, of what age, fuel and emissions standard. Those tables are the objective record behind the anecdotes - the pace of Euro VI penetration, the still-small but growing zero-emission HGV count, the van fleet’s expansion. Anyone writing a decarbonisation slide for a customer should be pulling from these tables rather than rounding from memory, because procurement teams increasingly check.
The statistics are not academic background; they drive the mechanisms fleets now operate inside. The sector’s 30% share is the argument behind every transport decarbonisation commitment in government policy. Customer-side, the same numbers flow into contract requirements: large companies reporting their own emissions under carbon reporting rules need their transport suppliers’ data, and the freight in their supply chain is measured against the national picture the DfT publishes. A fleet that can state its own emissions performance against the official sector baseline - better or worse, with evidence - is a fleet that can answer tenders others cannot.
The honest reading of the 2024 edition is mixed. Ten per cent below pre-pandemic levels shows change is possible; the flat year-on-year movement shows it is not automatic. The policy environment built around these numbers - phase-out dates for non-zero-emission vehicles at the car and van end, grant and infrastructure programmes for zero-emission HGVs, and the reporting regimes that push carbon questions down supply chains - is designed to bend the transport line downward again. Whether it bends is measured, year by year, in exactly this release.
110.4 MtCO2e, 30% of UK domestic emissions, 29% of NOx, flat on the year. Those four numbers are the frame for every environmental conversation a freight business will have this decade - with government, with customers and with its own board. Know them, cite the source, and measure your own fleet against them.
The statistics are compiled by the Department for Transport from energy use, licensing and testing data across the fleet, and the methodology matters for anyone quoting them. The figures count domestic transport - UK-based activity - and are expressed as carbon dioxide equivalent so different greenhouse gases compare on one scale. The accompanying data tables let you cut the picture by mode, fuel and year, which is the right source for any fleet building its own baseline: national numbers for context, your own telematics and fuel records for the fleet figure, and the same definitions on both sides so the comparison holds. Citing the release by name in customer documents also answers the procurement question ‘where does that number come from?’ before it is asked.