Bronte Wells
The aviation industry has an undeniable impact on the environment, with airplanes burning fossil fuels that release harmful emissions into the atmosphere. These emissions, including carbon dioxide, nitrogen oxides, water vapour, and soot, contribute to climate change and air pollution. Airports also contribute to water pollution through the use and handling of jet fuel, lubricants, and chemicals. Additionally, airport personnel and residents nearby are at risk of exposure to toxic jet engine emissions, which can have adverse health effects. While the aviation industry has made improvements in fuel efficiency, the rapid growth of air travel continues to drive an increase in overall emissions. As a result, there is a pressing need to develop sustainable solutions and policies to reduce the environmental footprint of the aviation sector.
| Characteristics | Values |
|---|---|
| Gases | Carbon dioxide, water vapour, nitrogen oxides, carbon monoxide, methane, nitric oxide, nitrogen dioxide |
| Atmospheric particulates | Incompletely burned hydrocarbons, sulfur oxides, black carbon, soot, nano-sized particles |
| Fuel | Jet fuel, Avgas (leaded fuel), fossil fuels |
| Other | Noise, water pollution, chemical spills, de-icing fluids |
| Impact | Global warming, climate change, air pollution, ozone depletion, health issues, acid rain |
| Mitigation | Alternative fuels, clean fuels, reduced corporate travel, improved efficiency, economic incentives, policy changes |
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What You'll Learn
Airports and water pollution
Airports can generate significant water pollution due to their extensive use and handling of jet fuel, lubricants, and other chemicals. Chemical spills can be prevented by spill containment structures and clean-up equipment such as vacuum trucks, portable berms, and absorbents. Airports also use de-icing fluids in cold weather, which can pollute water as they are often carried by surface runoff to nearby streams, rivers, or coastal waters. These de-icing fluids are typically made from ethylene glycol or propylene glycol, which exert high levels of biochemical oxygen demand, consuming oxygen needed by aquatic life. Pavement deicers used on runways and taxiways may also contain potassium acetate, glycol compounds, sodium acetate, urea, or other chemicals.
Airports have been encouraged to reduce their environmental impact and the risk of pollution. This includes reporting airline performance so that the public can compare airlines and consider noise levels when choosing an airline. Airports can also encourage the use of different operating procedures for aircraft to reduce emissions, such as altering the way they climb and descend during take-off and landing. Providing fixed electrical ground power and preconditioned air for airlines to use, optimising the flow of aircraft traffic to prevent idling and taxiing, and investing in transport links to encourage the use of public transport can also help. Additionally, providing recycling facilities for aircraft and terminal waste and investing in improved handling facilities and processes can reduce the risk of groundwater or surface water pollution from de-icing and fuel-handling equipment.
Aircraft engines produce gases, noise, and particulates from fossil fuel combustion, which have global effects on the environment and local air quality. Jet airliners contribute to climate change by emitting carbon dioxide (CO2), nitrogen oxides, contrails, and particulates. The combustion of jet fuel releases these emissions, which have a more significant impact due to the altitude at which they are released. While CO2 is the most significant and best-understood contribution to climate change, nitrogen oxides (NOx) also contribute to climate change and air pollution by reacting with other atmospheric compounds to form ozone in the troposphere and potentially destroying ozone in the stratosphere. Soot or black carbon particles produced during combustion have a warming effect by absorbing sunlight and contributing to atmospheric heating. Sulfur oxides (SOx) are present in smaller amounts but contribute to acid rain and can have adverse health effects.
Water vapour released at high altitudes by aircraft can contribute to the formation of contrails, which have a warming effect on the climate. The formation of contrails can be reduced by using clean fuels with lower aromatics and naphthalene concentrations, as these increase soot formation and persistent contrail cirrus. Changing flight paths to avoid Ice Super Saturated Regions (ISSR) and flying at lower altitudes can also help prevent contrail formation.
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Jet fuel and soot formation
Jet fuel combustion in aircraft engines produces soot emissions, which contribute to global warming by forming contrail cirrus clouds. These clouds can make up to 56% of the total radiative forcing from aviation. Aromatic jet fuels with high concentrations of aromatics and naphthalene increase soot formation, which leads to persistent contrail cirrus. Aromatics in jet fuel can be reduced through hydrotreating, which can lower non-CO2 effects without incurring significant costs.
Soot emissions from jet fuel combustion are composed of nanoparticles that form large agglomerates. These nanoparticles have a carbon core and are associated with polycyclic aromatic hydrocarbons (PAHs) and metals. The presence of oxygen during combustion enhances the formation of PAHs, which increase the soot volume fraction and number density. Increasing oxygen concentrations further can nearly eliminate soot emissions by enhancing oxidation.
Sustainable Aviation Fuels (SAFs) offer a promising avenue for reducing soot emissions in the aviation industry. SAF blends have been shown to result in a reduced soot yield compared to conventional jet fuel. Biofuel blending has been found to lower soot reactivity at ground idle, but its effect at higher power conditions is less certain.
The impact of soot emissions from jet fuel extends beyond global warming. Airport personnel and residents living nearby are at risk of occupational exposure to jet engine emissions, which include volatile organic compounds and particulate matter. These emissions have been linked to adverse health effects, including cancer.
Overall, jet fuel soot formation is a critical issue that contributes to global warming and poses health risks for individuals exposed to jet engine emissions. Efforts to reduce soot emissions, such as using SAFs and biofuel blending, hold promise for mitigating these negative impacts.
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Carbon dioxide emissions
Carbon dioxide (CO2) emissions from jet and airplane engines are a significant contributor to climate change. The combustion of jet fuel releases CO2, which is the most significant and well-understood driver of climate change from aviation. While aviation only accounts for around 2-2.5% of global CO2 emissions, its impact is disproportionately higher due to the altitude at which emissions are released.
The aviation industry has made efforts to improve fuel efficiency and reduce CO2 emissions. Between 1960 and 2000, fuel efficiency improved by 55-67%, and by 2014, the average fuel burn of new aircraft had decreased by 45% compared to 1968. By 2018, CO2 emissions per revenue ton-kilometer (RTK) were more than halved compared to 1990. However, the absolute emissions from aviation are expected to continue rising due to the increasing demand for air travel, especially in developing countries.
To further reduce CO2 emissions, the aviation industry has adopted a goal of carbon-neutral growth from 2020 onwards. This includes improving aircraft technology, operations, and infrastructure, as well as increasing the use of aviation biofuels. Additionally, reducing corporate travel can significantly decrease CO2 emissions, as demonstrated by the decrease in air travel during the COVID-19 pandemic.
The combustion of jet fuel also produces non-CO2 emissions, such as nitrogen oxides (NOx), water vapour, soot or black carbon, and sulfur oxides (SOx). These emissions have complex effects on the atmosphere and contribute to both climate change and air pollution. While the impact of non-CO2 emissions is not yet fully understood, they are estimated to contribute twice as much to global warming as aircraft CO2 emissions.
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Nitrogen oxides and air pollution
Nitrogen oxides (NOx) are a group of highly reactive gases that contribute to both climate change and air pollution. They are produced during the combustion of fossil fuels, such as jet fuel, and can also be formed through the direct combination of atmospheric oxygen and nitrogen in flames. While nitrogen oxides are produced naturally by lightning and microbial processes in soils, human activities, such as aviation, have significantly increased their presence in the atmosphere.
In the context of aviation, the combustion of jet fuel releases nitrogen oxides into the atmosphere. These emissions occur not only during flight but also during ground operations, such as taxiing and idling. The nitrogen oxides emitted by aircraft engines include nitric oxide (NO) and nitrogen dioxide (NO2), which are collectively referred to as NOx. NOx emissions from aviation contribute to the formation of ozone (O3) in the upper troposphere, leading to potential ozone destruction in the stratosphere. This complex process is not yet fully understood by scientists.
Nitrogen dioxide (NO2) is a significant component of nitrogen oxides and is used as an indicator for the presence of other nitrogen oxides. NO2 is primarily released into the air through the burning of fuel in vehicles, power plants, and industrial processes. Exposure to high concentrations of NO2 can irritate the airways and aggravate respiratory diseases, particularly asthma. It can also lead to the development of asthma and potentially increase susceptibility to respiratory infections. The areas most affected by NO2 pollution are those near major roadways, with concentrations up to 100% higher than in less trafficked areas.
Nitrogen oxides contribute to air pollution in several ways. They react with other atmospheric compounds, leading to the formation of ground-level ozone, which acts as a pollutant. Additionally, nitrogen oxides can combine with volatile organic compounds (VOCs), sulfur oxides, and other pollutants to form fine particulate matter (PM2.5). These tiny particles can penetrate deep into the lungs, causing respiratory diseases and aggravating heart conditions. Furthermore, nitrogen oxides impact visibility, as the nitrate particles that result from NOx emissions make the air hazy and reduce visibility.
To mitigate the impact of nitrogen oxide emissions, regulatory bodies such as the Environmental Protection Agency (EPA) in the United States have implemented rules and standards to reduce NOx emissions. These regulations aim to help state and local governments meet air quality standards and improve overall air quality. By addressing nitrogen oxide emissions, we can not only improve air quality but also potentially reduce their impact on climate change and human health.
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Health effects of jet emissions
The combustion of jet fuel releases carbon dioxide (CO2), the most well-understood greenhouse gas, as well as nitrogen oxides (NOx), water vapour, carbon monoxide, and atmospheric particulates such as incompletely burned hydrocarbons, sulfur oxides, and black carbon. These emissions contribute to climate change and air pollution, with non-CO2 emissions having twice the impact on global warming as CO2.
Jet engine emissions contain nano-sized particles that can reach the lower airways upon inhalation. These emissions are similar to diesel exhaust particles, which are carcinogenic and have been linked to adverse health effects, including cancer. Airport personnel and residents living close to airports are at risk of occupational exposure to these harmful emissions, which can result in increased hospital admissions and self-reported lung symptoms.
The health effects of jet emissions are not limited to those directly exposed to jet engine emissions. Aviation emissions from landing and takeoff operations (LTO) can degrade local and regional air quality, leading to adverse health outcomes in populations near airports and downwind. For example, LTO-attributable NO2 emissions have been linked to increased asthma exacerbations, with a rise in cases from 100,000 in 2011 to 170,000 in 2016.
Additionally, airports themselves can generate significant water pollution due to their handling of jet fuel, lubricants, and other chemicals. Deicing fluids used in cold weather can pollute water sources, and the degradation of these fluids in surface waters can consume oxygen needed by aquatic life.
To mitigate the health impacts of jet emissions, the aviation industry can adopt sustainable alternative jet fuels, which have been shown to reduce premature mortalities associated with traditional jet fuel. Reducing corporate travel and changing flight paths to avoid Ice Super Saturated Regions (ISSR) can also help lower the impact of non-CO2 emissions.
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Frequently asked questions
Aircraft engines burn fossil fuels, which releases gases and atmospheric particulates, including carbon dioxide (CO2), water vapour, nitrogen oxides (NOx), carbon monoxide, incompletely burned hydrocarbons, sulfur oxides, and black carbon. Additionally, airports can generate significant water pollution due to their handling of jet fuel, lubricants, and other chemicals.
Aviation emissions are a significant contributor to climate change, with the combustion of jet fuel being the primary culprit. The impact of aviation is disproportionately significant due to the altitude at which the emissions are released. Aircraft noise, particularly around airports, can also have a significant impact on local communities. Furthermore, airport personnel and residents living close to airports are at risk of exposure to jet engine emissions, which have been linked to adverse health effects, including cancer.
To reduce pollution, airplanes can use clean fuels with lower emissions, such as alternative jet fuels. Additionally, flying at lower altitudes and rerouting flights to avoid Ice Super Saturated Regions can help reduce the formation of contrails. Reducing corporate travel and overall demand for air travel can also significantly decrease aviation emissions.
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