
Cars are the primary source of transport-related carbon emissions in the UK, and London is no exception. In fact, road transport accounts for three-quarters of London's carbon emissions from the transport of people and goods. A significant portion of these emissions come from diesel cars, which emit three times as much pollution as trucks and lorries combined. In addition, cars in London have been found to emit higher levels of harmful nitrogen oxide (NOx) emissions, contributing to the city's air pollution crisis. The Mayor of London and the government have set ambitious goals to tackle this crisis, including encouraging the use of e-bikes and e-scooters as alternatives to cars for shorter trips.
| Characteristics | Values |
|---|---|
| Cars as a source of pollution in London | Cars are a significant source of pollution in London, with road transport being the largest emitting sector of greenhouse gas emissions. |
| London's carbon emissions from transport | 25% of London's carbon emissions come from the transport of people and goods, with three-quarters of these emissions coming from road transport. |
| Diesel car pollution in London | Diesel cars in London emit three times more pollution than trucks and lorries combined, with diesel cars contributing 5,717 tonnes of nitrogen oxide emissions compared to 1,808 tonnes from heavy goods vehicles. |
| Petrol car emissions | A petrol car journey from London to Glasgow emits approximately four times more CO2e per passenger than the equivalent journey by coach or electric car. |
| Electric car emissions | Electric cars produce fewer emissions than petrol cars, with an estimated emission of 28-29 kg of CO2e for a journey from Glasgow to London. |
| Impact of vehicle type on emissions | Vehicle type influences emissions, with vans emitting 5,000 more tonnes of nitrogen oxides in the last decade, while other vehicle types have reduced NOx emissions. |
| London's contribution to UK transport emissions | London is one of the major UK cities contributing the most to transport emissions, along with Birmingham and Leeds. |
| London's air quality concerns | London's air quality is a significant concern, with groups advocating for phasing out polluting cars and improving walking and cycling infrastructure. |
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What You'll Learn
- Diesel cars in London emit three times more pollution than trucks and lorries
- London's transport emissions increased by 3.8% in 2022
- Cars are the primary source of transport CO2 emissions in the UK
- London's transport of people and goods contributes 25% of its carbon emissions
- London's air quality is a concern for four-fifths of its residents

Diesel cars in London emit three times more pollution than trucks and lorries
In 2022, UK transportation emissions increased by an estimated 3.8% year-on-year to 112.5 million metric tons of carbon dioxide. London, Birmingham, and Leeds were the top three cities contributing the most to emissions. Cars are the primary source of transport CO2 emissions in the UK, and road travel accounts for 91% of domestic transport emissions.
According to the Clean Cities Campaign, diesel cars in London emit three times more pollution than trucks and lorries combined. The latest data shows that diesel cars produce 5,717 tonnes of nitrogen oxide (NOx) emissions, while heavy goods vehicles (HGVs) produce only 1,808 tonnes. This is a significant shift from 2013 data, which showed that HGVs emitted similar levels of NOx emissions as diesel cars. The share of harmful NOx emissions from diesel and petrol cars has also risen in every London borough (excluding the City of London), increasing by 26% between 2013 and 2019.
NOx emissions react with other compounds in the air to form nitrogen dioxide (NO2), a toxic gas that has been linked to stunted lung growth in children and the premature deaths of 4,000 Londoners annually. The high levels of NO2 in London's air have been primarily attributed to diesel exhaust, with London roads having some of the highest NO2 concentrations in the world in 2014.
To address this issue, London has implemented low and ultra-low emission zones to reduce NOx exhaust emissions and improve air quality. The Ultra Low Emission Zone (ULEZ) expansion to Outer London targeted diesel vehicles that did not meet the Euro 6 emission standard. These measures have helped reduce NO2 concentrations at busy roadsides by about two-thirds over more than 15 years.
Additionally, the number of new diesel car registrations in the UK has been consistently declining since 'dieselgate' in September 2015. However, diesel cars continue to be a significant source of pollution in London, and green groups are urging for further action to improve air quality in the city.
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London's transport emissions increased by 3.8% in 2022
In 2022, UK transportation emissions rose by an estimated 3.8% year-on-year to 112.5 million metric tons of carbon dioxide (MtCO₂). Domestic transport in the UK emits 99 million tons of carbon dioxide equivalent (MtCO2e), with road travel accounting for 91% of these emissions. Transport is the largest emitting sector of greenhouse gas (GHG) emissions, responsible for 24% to 28% of the UK’s total emissions.
London is one of the major cities contributing the most to transport emissions, alongside Birmingham and Leeds. Cars are the primary source of transport CO2 emissions in the UK, and emissions are dependent on vehicle type. Vans, for example, have increased NOX emissions, while other vehicle types have generally reduced theirs.
While London's transport emissions increased in 2022, some areas around the city, such as Warwick and West Berkshire, saw large reductions in transport emissions of up to 26% in 2020 due to COVID-19 restrictions.
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Cars are the primary source of transport CO2 emissions in the UK
London's air quality has been a significant concern, with various campaigns urging local election candidates to prioritise clean air policies. The #CleanAirWins campaign, supported by 19 environmental groups, called for a phase-out of polluting cars, giving priority to buses, and reallocating space for walking and cycling. These initiatives aim to reduce congestion and improve the city's air quality.
The UK government has also acknowledged the impact of transport emissions, with data showing that domestic transport emitted 99 million tonnes of carbon dioxide equivalent (MtCO2e) in 2022. Road travel accounted for 91% of these emissions, making it the largest emitting sector of greenhouse gases. On average, each local authority emitted 281 kilotonnes of CO2 in 2020, with transport contributing 24% of the UK's total emissions.
To address these emissions, there has been a push towards alternative modes of transport. The Mayor of London has set ambitious goals to tackle the climate emergency and air pollution crisis, and initiatives like e-bikes and e-scooters are being explored as convenient and affordable alternatives for shorter trips. Additionally, London's Transport Strategy aims to increase the sustainable modal share in inner London boroughs to 90% by 2041, encouraging residents to opt for more sustainable travel options.
While cars remain the primary source of transport CO2 emissions in the UK, efforts are being made to reduce their impact. By promoting sustainable alternatives, improving fuel efficiency, and implementing policies to disincentivise driving, the UK aims to mitigate the environmental and health consequences of transport emissions.
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London's transport of people and goods contributes 25% of its carbon emissions
London's transport system is a major contributor to the city's carbon emissions. The transport of people and goods in London contributes to approximately 25% of the city's carbon emissions. This includes emissions from cars, vans, lorries, and other vehicles used for transportation.
Cars are a significant contributor to London's carbon emissions. A journey from London to Glasgow in a petrol car emits about four times more CO2e per passenger than the same trip by coach. Electric cars are a more environmentally friendly option, emitting slightly fewer greenhouse gases than coaches. However, the environmental impact of electric vehicles is uncertain due to the complex indirect effects of greenhouse gas interactions in the atmosphere.
London's public transport system plays a crucial role in reducing the city's carbon footprint. The city's residents rely more on public transport than other parts of the UK, and encouraging the use of buses, coaches, and trains can significantly reduce emissions. For example, switching just one car journey out of every 25 to bus or coach can save 2 million tonnes of CO2. Additionally, rail travel produces significantly fewer emissions per passenger mile than cars or planes, but it only accounts for 1% of the UK's transport emissions due to lower usage.
To further reduce emissions, London has implemented initiatives such as car clubs, which provide newer and more environmentally friendly vehicles. These cars emit around 25% less CO2 than the average private vehicle. Magway, a zero-emissions delivery solution, is also being developed to improve air quality and cut carbon emissions from goods transportation. The Ultra Low Emission Zone (ULEZ) expansion aims to improve air quality in certain areas of London, but it only covers half of Londoners living within the boundary.
While London has made strides in reducing transport emissions, data shows that overall UK transportation emissions increased by an estimated 3.8% year-on-year in 2022, reaching 112.5 million metric tons of carbon dioxide. This increase is attributed to various factors, including the rise in online shopping and the increased use of vans, which emit 5,000 more tonnes of nitrogen oxides than a decade ago. Despite these challenges, London and the UK continue to explore ways to reduce transport emissions and address climate change.
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London's air quality is a concern for four-fifths of its residents
Diesel cars have been a particular focus of concern in London. According to the Clean Cities Campaign, diesel cars emit three times as much pollution as trucks and lorries combined. This is a shift from 2013, when HGVs emitted similar levels of nitrogen oxide (NOx) emissions as diesel cars. However, the share of harmful NOx emissions from diesel and petrol cars has risen in almost every London borough since then, increasing by 26% between 2013 and 2019.
The Mayor of London and the government have set ambitious goals to tackle the climate emergency and air pollution crisis. These targets will require significant changes in a short amount of time. Encouraging the use of e-bikes, e-scooters, and improving conditions for walking and cycling can help reduce car usage. Additionally, the proposed smart road user charging scheme aims to reduce congestion and emissions by discouraging driving and promoting sustainable alternatives.
London is not unique in its struggle with transport emissions. UK transportation emissions increased by an estimated 3.8% in 2022 to 112.5 million metric tons of carbon dioxide. Major cities like London, Birmingham, and Leeds contribute the most to these emissions, impacting air quality and public health, especially for vulnerable populations. While emissions from international aviation fell by 61% between 2019 and 2020, the largest fall on record, domestic transport emissions remain a pressing issue.
To address London's air quality concerns, a coalition of 19 campaign groups, including Friends of the Earth, Asthma + Lung UK, and Mums for Lungs, urged council candidates in the 2022 local elections to commit to cleaning up the city's toxic air. Their #CleanAirWins campaign advocated for phasing out polluting cars, giving buses more priority, and reallocating public spaces for walking, cycling, and parks. These measures aim to create a healthier and more sustainable future for London and its residents.
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Frequently asked questions
Diesel cars in London emit three times more pollution than trucks and lorries combined.
London is one of the UK cities that contributes the most to emissions, alongside Birmingham and Leeds. However, it is difficult to give a precise answer as emissions are calculated per local authority.
Cars are the primary source of transport CO2 emissions in the UK. In London, 25% of carbon emissions come from the transport of people and goods, and three-quarters of these emissions come from road transport.
In 2022, UK transportation emissions increased by 3.8% to 112.5 million metric tons of carbon dioxide. This was a significant increase from 2020, when domestic transport emitted 99 million tonnes of carbon dioxide.











































