Helena Joyce
Airplane emissions are a significant contributor to climate change, with the aviation sector emitting large amounts of greenhouse gases and other pollutants into the atmosphere. Aircraft engines emit ultrafine particles (UFPs) and burn fossil fuels, releasing CO2 and other harmful substances such as nitrogen oxides, soot, and water vapour. The impact of aviation on global warming is estimated to be around 3.5% of effective radiative forcing, and if left unchecked, global aviation emissions are projected to triple by 2050. As a result, organisations like the WWF and the Center for Biological Diversity are advocating for the regulation of emissions and the development of electric aircraft to reduce the industry's carbon footprint and limit the effects of the climate crisis.
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What You'll Learn
Aircraft engines emit ultrafine particles (UFPs) and lead
Aircraft engines that burn Avgas, a leaded fuel, release lead into the atmosphere. In the United States alone, it is estimated that 167,000 piston aircraft engines burn Avgas, releasing 34,000 tons of lead into the air between 1970 and 2007. The Federal Aviation Administration recognizes that inhaled or ingested lead adversely affects the nervous system, red blood cells, and cardiovascular and immune systems. Lead emissions from aircraft engines contribute to air pollution that endangers public health and welfare.
The Environmental Protection Agency (EPA) has acknowledged the dangers of greenhouse gas pollution from aircraft to human health and welfare. However, despite litigation and petitions, the EPA has failed to release rules or standards to reduce these emissions. The Center for Biological Diversity and other organizations are advocating for swift action from the federal government to address climate pollution from the aviation industry. They are pushing for the adoption of ambitious standards and the development of electric aircraft to reduce and prevent carbon pollution from aircraft.
To address the issue of UFPs and lead emissions from aircraft engines, several measures can be considered. Firstly, improving fuel economy in aircraft and optimizing air traffic control and flight routes can help lower non-CO2 effects on the climate. Additionally, the use of aviation biofuel, emissions trading, and carbon offsetting can reduce CO2 emissions. Furthermore, short-haul flight bans, train connections, personal choices, and aviation taxation and subsidies can lower aviation usage, reducing the overall emissions impact.
While the aviation sector is a significant contributor to global emissions, it is important to recognize that other sources of air pollution, such as emissions from heating systems, industry, and road traffic, also play a role in degrading air quality and impacting human health. Therefore, a comprehensive approach to addressing air pollution and mitigating its effects on the environment and human health is necessary.
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Jet fuel increases soot formation and water pollution
Jet fuel is sprayed into aircraft combustors, creating locally fuel-rich conditions that result in incomplete combustion. This process leads to the formation of soot through incomplete combustion in locally fuel-rich regions at relatively low temperatures. The soot particles can be oxidized at higher temperatures, but this also increases the formation of thermal NOx, which is harmful to the environment and human health. Laboratory flames and Enclosed Spray Combustion (ESC) have been used to study the emissions from combustion systems, and it has been found that ESC produces soot with similar properties to that observed in real aircraft engines.
The trade-off between soot and NOx emissions during jet fuel combustion presents a challenge, as decreasing one pollutant often increases the other. While it is technically possible to achieve both low soot and NOx emissions through clever design, it is difficult to implement in practice due to the high temperatures and gas flow rates of aircraft engines. However, studies have shown that injecting air downstream of the ESC burner and into the exhaust of enclosed spray combustion can drastically reduce soot emissions, providing a potential solution to this issue.
In addition to air pollution, jet fuel also contributes to water pollution. The accumulation of water in aviation jet fuel is almost inevitable during storage and operations. Even small quantities of water can lead to rust development, and microbial contamination can occur when microorganisms present in the air and water grow, forming solid debris that clogs fuel filters and corrodes fuel tanks and systems. This type of contamination can be extremely costly to address and can cause significant disruptions to aviation operations.
The impact of jet fuel on soot formation and water pollution highlights the need for advancements in airplane efficiency and industry-wide regulations to reduce aviation's contribution to climate change and protect public health and welfare.
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Aviation is a significant contributor to climate change
The number of passengers and freight carried by the aviation industry has quadrupled between 1990 and 2019, and the sector is expected to fully recover from the COVID-19 pandemic by 2024. With increased demand and technological improvements, aviation emissions have more than doubled between 1990 and 2019, and they could triple by 2050. In Europe, aviation emissions have grown from 1.5% in 1990 to 4.7% in 2019, and globally, aviation contributes 2.5% of annual CO2 emissions.
To address these concerns, organizations like the Center for Biological Diversity and WWF are advocating for regulations and policies to reduce aviation emissions. The adoption of electric aircraft, improved fuel economy, and the use of clean fuels can help mitigate the environmental impact of aviation. Additionally, individuals can reduce their carbon footprint by flying less often, as air travel is one of the most carbon-intensive activities an individual can undertake.
The aviation sector must take urgent action to curb its emissions and contribute to the global effort to limit the temperature increase to 1.5°C. Without advancements in airplane efficiency and industry-wide regulations, the effects of aviation on climate change will continue to be significant.
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Air travel is a carbon-intensive activity
The impact of aviation on carbon emissions is expected to grow. By 2050, global aviation emissions may triple compared to pre-COVID levels, with a projected increase of over 300% from 2005 levels. This growth is driven by increased demand for air travel and technological advancements. Between 1990 and 2019, both passenger and freight demand quadrupled, and the number of passengers carried by the aviation industry is forecast to rise from 2.4 billion in 2010 to 8.2 billion in 2035.
Aircraft engines emit ultrafine particles (UFPs) and release pollutants such as nitrogen oxides (NOx), soot, sulfur aerosols, and water contrails, which have strong warming effects. Additionally, piston engines used in private airplanes burn Avgas, releasing toxic lead into the atmosphere, which has adverse effects on human health. Airports also contribute to water pollution due to their handling of jet fuel, lubricants, and de-icing chemicals.
To address these issues, various measures have been proposed and implemented. These include the use of clean fuels, such as aviation biofuel and e-kerosene, improving fuel economy, optimizing air traffic control and flight routes, and adopting electric aircraft operations. Organizations like the World Wildlife Fund (WWF) and the Center for Biological Diversity are working to push for regulations, policies, and measures to reduce aviation emissions and limit the effects of the climate crisis.
While air travel is a significant contributor to carbon emissions, it is important to note that it accounts for a smaller share of global emissions compared to other sectors. This is because flying is an activity that not everyone engages in, with only about 10% of the world's population flying in most years. However, as incomes rise and demand increases, the impact of aviation on the environment is expected to become more pronounced.
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Airports generate water pollution from jet fuel and de-icing chemicals
Airports are a significant source of water pollution, with jet fuel and de-icing chemicals being key contributors. Jet fuel contamination can occur through various means, including microbial growth, water accumulation, and airborne particles. Microbial contamination, such as bacteria, yeasts, and fungi, can lead to the formation of solid debris that clogs fuel filters and produces acidic by-products that accelerate metal corrosion. Even small quantities of water in jet fuel systems can lead to rust development, causing further issues. Additionally, dust, pollen, rubber, and fabric particles can find their way into the fuel, impacting its quality.
The accumulation of water in aviation jet fuel is almost inevitable due to factors such as pipeline moisture, rainwater leakage, and moisture in the air. While aviation fuels are initially sterile, they become contaminated with microorganisms from the air and water. Contamination can cause significant financial losses and ground aircraft for extended periods. Detecting contamination early is crucial, especially with the increasing demand for aviation in developing economies.
De-icing operations at airports are essential for ensuring the safety of passengers and cargo operations in icy conditions. However, these operations can degrade nearby water bodies if not properly controlled and treated. The Federal Aviation Administration (FAA) mandates that airports collect and treat wastes from de-icing activities. Airports with a certain number of annual departures in cold climates are required to collect a significant portion of aircraft de-icing fluid to minimize water pollution.
The environmental impact of the aviation industry extends beyond water pollution. Aircraft emissions contribute significantly to global warming, with the sector ranking among the top carbon-polluting nations if it were a country. Emissions from domestic aviation in the United States have increased by 17% since 1990, and aircraft are one of the fastest-growing sources of emissions. Without advancements in efficiency and regulations, commercial aviation emissions are projected to triple by 2050.
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Frequently asked questions
Airplanes burn fossil fuels, which release CO2 emissions and other gases and pollutants. These non-CO2 effects, such as nitrogen oxides, vapour trails, soot, and cloud formations, contribute twice as much to global warming as aircraft CO2.
Airplane pollution is a significant contributor to climate change. If the aviation sector were a country, it would be one of the top 10 carbon-polluting nations. Airplane pollution also has adverse effects on human health and welfare. Aircraft noise pollution can disrupt sleep and children's education and may increase cardiovascular risk.
Airplane pollution can be reduced by adopting cleaner fuels, improving fuel economy, and optimising air traffic control and flight routes. Electric aircraft operations, for example, do not produce any emissions. Individuals can also play a part by flying less often.
Various organisations are campaigning for regulations and policies to reduce pollution from aviation. For example, the WWF advocates for the US to regulate emissions on flights within the US, and the Center for Biological Diversity is demanding swift action from the US federal government to reduce aviation greenhouse gas emissions.
