Kiera Jefferson
Planes and trucks are major contributors to air pollution. Aviation is one of the worst climate change culprits, with airplanes emitting around 100 times more CO2 per hour than a shared bus or train ride. The emissions of global aviation are around 1 billion tons of CO2 per year, more than the emissions of most countries. Similarly, trucks are a leading source of harmful air pollution, particularly diesel trucks, which emit black carbon and soot. A study in Vancouver and Toronto found that air pollution levels beside a major trucking route within a city were almost as high as those beside a major highway.
| Characteristics | Values |
|---|---|
| Planes' contribution to global CO2 emissions | 2.4% to 2.5% in 2018, 2.5% in 2019 |
| Planes' contribution to global warming | 5% |
| Planes' contribution to global climate change | 3.5% in 2011, likely the same in 2018 |
| Planes' contribution to US transportation emissions | 10% |
| Planes' contribution to US total greenhouse gas production | 3% |
| Planes' contribution to EU CO2 emissions | 4.7% in 2019 |
| Global commercial aviation's ranking among national GHG emissions | 6th in the world |
| Aviation's contribution to global warming | 300% by 2050 |
| Trucks' contribution to air pollution | Not found |
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What You'll Learn
- Planes emit 100x more CO2 per hour than trains or buses
- Air pollution from planes causes 16,000 premature deaths annually
- Trucks are a leading source of harmful air pollution
- Zero-emission trucks reduce smog-forming nitrogen oxide emissions
- Airports increase particle number concentrations in nearby residences
Planes emit 100x more CO2 per hour than trains or buses
Transport is responsible for about a quarter of global carbon dioxide (CO2) emissions. While aviation only accounts for 2.5% of global CO2 emissions, its overall contribution to climate change is higher. This is because planes emit other substances into the upper atmosphere that have a stronger warming effect than CO2. These include nitrogen oxides, water vapour, soot, and contrails. In fact, these non-CO2 emissions have twice the impact on global warming compared to aircraft CO2 emissions.
The impact of flying on global warming is even more significant when we consider the small number of people who fly. Studies estimate that only 10% of the world's population flies in most years. This means that a small percentage of people are contributing disproportionately to climate change.
When it comes to the carbon footprint of different modes of transport, planes emit significantly more CO2 per hour than trains or buses. For example, a train trip from Paris to Bordeaux emits just 4.4 kg of CO2 per passenger, while a flight from London to Madrid emits 118 kg of CO2 per passenger. Even when we consider the type of train, flying still emits more CO2. For instance, diesel trains can emit more than 90 g of CO2 per passenger per kilometre, while a flight emits about 154 g of CO2 for the same distance.
To put it into perspective, taking a train instead of a plane for a medium-length distance can reduce your emissions by up to 86%. For instance, the Eurostar from London to Paris emits around 4 g of CO2 per passenger kilometre, while a short-haul flight emits 154 g of CO2. That's a huge difference and shows that trains are a much lower-carbon way to travel than planes.
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Air pollution from planes causes 16,000 premature deaths annually
Air pollution is a critical issue that claims the lives of millions annually. While various sectors contribute to this problem, the aviation industry stands out as a significant culprit. Airplane pollution encompasses emissions from aircraft engines, airport operations, and related activities, all of which have severe health and environmental consequences.
Aircraft engines burn fossil fuels, releasing carbon dioxide (CO2), nitrogen oxides (NOx), soot, and other pollutants into the atmosphere. This cocktail of emissions has a profound impact on global warming and climate change. Notably, the non-CO2 effects, such as the formation of contrails and induced cirrus clouds, contribute twice as much to global warming as aircraft CO2 emissions. These contrails, or water vapour trails, are the largest contributor to aviation's warming effect, and their persistence is influenced by soot and other emissions in high-humidity regions.
The impact of aviation pollution on human health is dire. In 2020, a nine-year-old girl in London, Ella Adoo-Kissi-Debrah, became the first person globally to have 'air pollution' listed as a cause of death on her death certificate. She suffered from asthma, and the coroner's court concluded that air pollution played a significant role in her death. While this outcome is rare, researchers agree that air pollution is responsible for millions of premature deaths worldwide each year. The World Health Organization (WHO) estimates that approximately 7 million people die annually due to air pollution, with 4.2 million of those deaths attributed to outdoor air pollution.
While aviation accounts for around 2.5% of global CO2 emissions, its overall contribution to climate change and air pollution is more significant. In 2019, aviation emissions in Europe totalled 147 million tonnes of CO2, and this number is projected to grow. By 2030, the aviation industry's share of global CO2 emissions may reach 3.5%. Additionally, aviation activities emit ozone, ultrafine particles, and other pollutants that pose severe health risks.
To address aviation's role in air pollution and its deadly consequences, several measures can be implemented:
- Transition to cleaner fuels: Zero-emissions aircraft, such as electric or hydrogen-powered planes, offer a promising solution for reducing aviation emissions, especially for shorter ranges. However, significant funding is required to bring these aircraft into operation by the mid-2030s.
- Improve fuel economy: Enhancing the fuel economy of aircraft and optimising air traffic control and flight routes can help lower the climate impact of non-CO2 emissions.
- Explore alternative fuels: Aviation biofuels, e-fuels, and hybrid electric aircraft can play a role in reducing emissions, although their effectiveness depends on the source of CO2 required to produce them.
- Reduce aviation usage: Individuals can contribute by choosing more sustainable modes of transport, such as trains, opting for fewer but longer holidays, and utilising teleconferencing for business meetings.
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Trucks are a leading source of harmful air pollution
While planes are a significant contributor to air pollution, trucks are also a leading source of harmful air pollution. Trucks, along with other vehicles that use diesel fuel, release nitrogen oxides (NOx), particulate matter, and black carbon into the atmosphere. These pollutants have detrimental effects on both the environment and human health.
Nitrogen oxides contribute to the formation of smog and ground-level ozone, which can irritate the respiratory system and exacerbate respiratory conditions such as asthma. Particulate matter, which includes tiny particles of soot and other harmful substances, can penetrate deep into the lungs and enter the bloodstream, leading to respiratory and cardiovascular problems. Black carbon, a component of soot, not only affects air quality but also contributes to climate change by absorbing sunlight and warming the atmosphere.
In addition to tailpipe emissions, trucks also contribute to air pollution through indirect sources. Idling truck engines, for example, release pollutants into the air, particularly in congested urban areas or at loading docks and distribution centres. Furthermore, evaporative emissions from fuel storage and distribution, as well as tyre and brake wear, add to the overall pollution generated by trucks.
The impact of truck pollution is particularly pronounced in areas with high traffic volume, such as near highways or in densely populated urban centres. Communities living in these areas, especially those from low-income backgrounds or minority groups, bear a disproportionate burden of the negative health effects associated with truck pollution. This issue of environmental injustice underscores the urgency of implementing measures to reduce truck emissions.
To mitigate the harmful effects of truck pollution, several strategies can be employed. Firstly, transitioning to cleaner fuels and alternative energy sources, such as electricity, hydrogen, or biofuels, can significantly reduce emissions. Additionally, improving fuel efficiency and engine technology can lower the amount of pollutants released into the atmosphere. Implementing stricter emission standards and regulations for trucks can also help curb pollution levels.
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Zero-emission trucks reduce smog-forming nitrogen oxide emissions
Planes and trucks contribute significantly to air pollution. While aviation accounts for about 2.5% of global CO2 emissions, its overall contribution to climate change is more significant. Planes emit carbon dioxide (CO2), nitrogen oxides, contrails, and particulates, which have a warming effect on the atmosphere.
Trucks, particularly diesel trucks, are also major contributors to air pollution, especially when idling, moving slowly, or making frequent stops, as these actions increase nitrogen oxide (NOx) emissions. NOx is a key component of smog and has been linked to respiratory issues, cardiovascular problems, and even premature death.
To address this issue, California has implemented regulations to reduce smog-forming nitrogen oxide emissions from heavy-duty diesel trucks. The state has approved the "Heavy-Duty Low NOx Omnibus Regulation," which imposes stricter emissions standards, overhauls engine testing procedures, and extends engine warranties to ensure reduced NOx emissions.
Additionally, California has met its target for zero-emissions truck sales two years ahead of schedule. The transition to zero-emission electric and hydrogen fuel cell trucks is crucial, as it will significantly reduce smog-forming nitrogen oxide emissions. The EPA expects that by 2045, the replacement of diesel trucks with zero-emissions alternatives will result in a 48% reduction in nitrogen oxide pollution.
While progress is being made, it is important to recognize that the transportation sector, including aviation and trucking industries, continues to contribute significantly to air pollution and climate change.
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Airports increase particle number concentrations in nearby residences
Aviation activities have a significant impact on air quality, particularly in the areas surrounding airports. Airports increase particle number concentrations (PNCs) in nearby residences, which is a major concern due to its impact on public health.
Several studies have been conducted to investigate the impact of airport operations on PNCs in nearby residential areas. One study analysed the sub-micron total particle number concentration (PNC) in the immediate vicinity of Berlin-Tegel Airport (TXL) and found that particle number concentrations in the lee of the airport were significantly higher than the mean of the entire area. Residences located along the eastward extension of the runways were significantly more affected than those outside the approach corridor.
Another study examined the impact of airport operations on PNCs in the adjacent neighbourhood of a suburban airport and found that the impact was comparable to the combined impact of busy roads in the area. Jet engine exhaust is a significant source of ultrafine particles, and aviation-related emissions can adversely affect air quality over large areas surrounding airports. For example, a study of residences near Boston's Logan International Airport found that UFP and NOx concentrations were greater than or equal to traffic emissions. Similarly, research by Hudda and Fruin (2016) and Keuken et al. (2015) showed that UFP emissions were elevated at distances of more than 8 km from airport runways.
The main engines of aircraft have been identified as the dominant source of airport emissions, responsible for 90% of non-volatile components. However, the concentration of these emissions decreases with distance from the airport. For example, less than 10% of total UFP was modelled at a distance of 2.5 km north of Frankfurt/Main Airport (FRA) in Germany, indicating that residences in close proximity to airports are exposed to higher concentrations of pollutants.
Overall, the evidence suggests that airports do increase particle number concentrations in nearby residences, with potential consequences for the health of those living in these areas.
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Frequently asked questions
Yes, planes contribute to air pollution by emitting carbon dioxide (CO2), the best-understood greenhouse gas, as well as nitrogen oxides, contrails, and particulates. In 2018, global commercial operations generated 2.4% of all CO2 emissions, and this figure is projected to increase.
Yes, trucks contribute to air pollution as they burn fossil fuels, releasing CO2 emissions. Trucks are included in road transport, which can become low-carbon through electrification.
Planes burn fossil fuels, releasing CO2 emissions and other pollutants. In addition, the non-CO2 effects of aviation, such as contrails and nitrogen oxides, contribute twice as much to global warming as aircraft CO2 emissions.
Trucks release CO2 emissions and other pollutants into the atmosphere, contributing to global warming and climate change.
