Greta Jimenez
Transportation is a significant contributor to air pollution and climate change. The burning of fossil fuels like gasoline, diesel, and natural gas releases carbon dioxide, a greenhouse gas, into the atmosphere, causing global warming and climate change. In the United States, transportation accounts for about 28% of total greenhouse gas emissions, with road travel contributing three-quarters of transport emissions. Passenger vehicles, such as cars and buses, are a major source of pollution, emitting carbon dioxide, nitrogen oxides, and particulate matter. Heavy-duty vehicles, such as freight trucks, also contribute significantly to pollution levels, releasing high levels of nitrogen oxides and particulate matter. Additionally, non-combustion sources, such as tyre and brake wear, further add to air pollution, particularly in urban areas with high traffic congestion. To address these issues, organizations like the EPA have implemented programs and standards to reduce emissions and improve air quality, including incentives for transitioning to electric vehicles and clean fuel technologies.
| Characteristics | Values |
|---|---|
| Types of pollution | Carbon dioxide, carbon monoxide, nitrogen oxides, sulfur dioxides, formaldehyde, benzene, methane, nitrous oxide, hydrofluorocarbons, volatile organic compounds, soot, particulate matter, and smog |
| Pollutant sources | Burning fossil fuels, combustion engines, fuel processing, tyre and brake wear, and non-exhaust sources |
| Pollutant impacts | Global warming, climate change, air pollution, health risks, environmental degradation, ocean temperature rise, severe storms, droughts, heat waves, flooding, wildfires, and public health issues |
| Polluting vehicles | Cars, trucks, SUVs, buses, ships, trains, airplanes, motorcycles, and freight vehicles |
| Pollution reduction strategies | Emission reduction strategies, national policies, regulations, incentive-based programs, fuel standards, vehicle efficiency, electric vehicles, clean vehicle technology, fuel economy, and transportation conformity |
| Pollution reduction programs | EPA's Diesel Emissions Reduction Act, Clean School Bus Program, SmartWay, and SmartWay Light Duty Program |
| Pollution reduction targets | By 2030, EPA aims to prevent premature deaths and reduce respiratory symptoms; by 2070, IEA's net-zero scenario aims for net-zero CO2 emissions from global energy |
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What You'll Learn
Carbon dioxide and other greenhouse gases
Carbon dioxide (CO2) is the most significant greenhouse gas emitted by vehicles. It is a byproduct of burning fossil fuels, such as petrol, diesel, and natural gas, for energy. Greenhouse gas (GHG) emissions from transportation account for about 28% of total US greenhouse gas emissions, making it the largest contributor of US GHG emissions. Between 1990 and 2022, GHG emissions in the transportation sector increased more in absolute terms than any other sector.
Road travel accounts for three-quarters of transport emissions, with most of this coming from passenger vehicles such as cars and buses (45.1%), and the remaining 29.4% from trucks carrying freight. Since the entire transport sector accounts for 21% of total emissions, road transport is responsible for 15% of total CO2 emissions.
Aviation, despite often being a focus of discussions on tackling climate change, accounts for only 11.6% of transport emissions, emitting just under one billion tonnes of CO2 annually. International shipping contributes a similar amount, at 10.6%. Rail travel and freight emit very little, at just 1% of transport emissions.
The burning of fossil fuels for transportation is the biggest source of carbon emissions in the US, accounting for about 31% of the total. Every gallon of gasoline burned releases 20 pounds of carbon dioxide into the atmosphere, where it can remain for thousands of years. The buildup of carbon dioxide and other greenhouse gases like methane (CH4), nitrous oxide (N2O), and hydrofluorocarbons (HFCs) is causing the Earth's atmosphere to warm, resulting in changes to the climate that we are already observing.
To reduce CO2 emissions, a transition to renewable energy sources, increased vehicle efficiency, and the promotion of electric and hybrid vehicles are necessary. The rise of electric vehicles offers a viable option to reduce emissions from passenger vehicles. Electric trucks and buses have significantly lower global warming emissions than vehicles powered by fossil fuels, and a battery-electric bus on today's electricity grid is the lowest-carbon option in every part of the country. A growing number of cities are committed to 100% zero-emission transit buses, including New York and Los Angeles, which have the country's two largest bus fleets.
The EPA has implemented national programs and standards for fuels and vehicles that reduce air pollution, including smog, soot, and toxic pollutants. The EPA's SmartWay light-duty program identifies the top-performing vehicles in terms of fuel economy and emissions to assist consumers in making environmentally friendly purchases. The EPA's regulations for passenger vehicles and trucks are projected to cut 7 billion metric tons of GHG emissions over the lifetimes of the vehicles sold between 2027 and 2032, nearly double fuel efficiency, and reduce America's dependence on oil.
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Nitrogen oxides and particulate matter
Nitrogen oxides, particularly nitrogen dioxide (NO2), are a significant concern when it comes to transportation pollution. NO2 is formed during the combustion of fossil fuels, especially at high temperatures, and is a common emission from cars, trucks, buses, and other vehicles. The burning of natural gas, both outdoors in power plants and industrial sites and indoors in appliances like stoves and heaters, also contributes to NO2 emissions.
NO2 is a harmful pollutant that can irritate the airways and aggravate respiratory issues like asthma. Prolonged exposure may even contribute to the development of asthma and increase susceptibility to respiratory infections. It is of particular concern to vulnerable groups, including people with asthma, children, and the elderly. Additionally, NO2 and other nitrogen oxides (NOx) interact with other chemicals in the atmosphere to form acid rain, which damages sensitive ecosystems such as lakes and forests. They also contribute to nutrient pollution in coastal waters and the formation of particulate matter and ozone.
Particulate matter (PM) refers to inhalable particles composed of various substances, including sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, and water. These particles can penetrate deep into the lungs and even enter the bloodstream, causing cardiovascular and respiratory issues. Both short-term and long-term exposure to PM is associated with adverse health effects, including morbidity and mortality from cardiovascular and respiratory diseases, adverse perinatal outcomes, and lung cancer.
Transportation, including vehicles, aviation, and shipping, is a major source of particulate matter pollution. The combustion of fuels in transportation processes contributes significantly to the presence of PM in the air. Efforts to reduce emissions from transportation sources, such as the implementation of emission reduction strategies and the development of clean vehicle technologies, are crucial for improving air quality and protecting public health.
Overall, nitrogen oxides and particulate matter are significant pollutants associated with transportation. Their presence in the air has detrimental effects on human health and the environment, underscoring the importance of initiatives aimed at reducing emissions and improving air quality.
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Smog and soot
Transportation is a major contributor to smog and soot pollution. Vehicles, including cars, trucks, and buses, emit harmful pollutants that contribute to smog formation. Diesel engines, in particular, produce high levels of nitrogen oxides and particulate matter, which are key components of smog. In addition, the burning of fossil fuels, such as gasoline and diesel, releases carbon dioxide, a greenhouse gas that contributes to climate change and the formation of smog.
To address these issues, the Environmental Protection Agency (EPA) in the United States has implemented a range of programs and regulations to reduce emissions from transportation sources. For example, the EPA has set stringent emissions standards for passenger vehicles and limits on the amount of sulphur in gasoline. These measures have resulted in significant improvements in air quality and public health, with reduced levels of smog and soot.
One example of a successful EPA program is the Diesel Emissions Reduction Act (DERA) program. This program provides funding in the form of grants and rebates to projects that reduce harmful emissions from diesel engines. Between 2009 and 2018, the DERA program helped retrofit or replace over 73,000 engines, leading to an estimated $8 billion in health benefits from reduced air pollutant emissions.
In addition to the DERA program, the EPA has also introduced the SmartWay program, which focuses on improving supply chain efficiency in the freight transportation industry to reduce air pollution. The program includes partnerships between shippers, carriers, and the EPA, as well as initiatives to promote brand awareness of fuel-saving technologies and global collaboration. The EPA has also set standards for greenhouse gas emissions and fuel economy for cars, light trucks, and heavy-duty trucks, with the goal of reducing emissions and improving fuel efficiency.
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Health risks and climate change
The transport sector is a major contributor to air pollution and climate change. It is responsible for a large proportion of air pollution and is a leading source of greenhouse gas emissions. Greenhouse gas (GHG) emissions from transportation account for about 28% of total US greenhouse gas emissions, making it the largest contributor of US GHG emissions. Globally, in 2010, the transport sector accounted for 14% of the greenhouse gas budget.
The burning of fossil fuels like gasoline and diesel releases carbon dioxide, a greenhouse gas, into the atmosphere. The buildup of carbon dioxide and other greenhouse gases like methane, nitrous oxide, and hydrofluorocarbons is causing the Earth's atmosphere to warm, resulting in climate change. Transport also produces short-lived climate pollutants like black carbon and ground-level ozone, a major component of smog. Black carbon has a warming effect many times more powerful than carbon dioxide, but it only persists in the atmosphere for a few weeks, so reducing black carbon emissions can have immediate effects.
The health risks associated with air pollution from transportation are significant. An estimated 4.2 million premature deaths are attributed to ambient (outdoor) air pollution. Higher air pollution concentrations increase the risk of cardiovascular and respiratory diseases, cancer, adverse birth outcomes, and are associated with higher death rates. Recent studies have shown excess morbidity and mortality for drivers, commuters, and individuals living near major roadways. Long-term exposure to ozone can lead to the development of asthma and aggravate various respiratory diseases. Environmental noise exposure from transportation is also responsible for a range of health effects, including an increased risk of ischaemic heart disease, sleep disturbance, and cognitive impairment among children.
Climate change caused by transportation emissions can also have wide-ranging impacts on the transportation system itself. For example, heat can damage runways and road infrastructure, and rising sea levels can cause flooding in coastal areas, disrupting transportation networks. Climate change can also have economic impacts on the transportation system, with warmer weather potentially lengthening the shipping season for some northern ports, but more intense rainfall interrupting cargo movement. Communities are taking steps to safeguard their transportation systems, with engineers developing solutions to bolster system resilience and planners considering climate data when designing, constructing, and maintaining transportation projects.
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Fossil fuels and clean energy alternatives
The burning of fossil fuels like gasoline and diesel releases carbon dioxide, a greenhouse gas, into the atmosphere. Greenhouse gas emissions from transportation account for about 28% of total US greenhouse gas emissions, making it the largest contributor to US GHG emissions. Passenger vehicles like cars and buses contribute 45.1% of road transport emissions, while trucks carrying freight account for 29.4%.
The use of fossil fuels in transportation has led to the development of alternative energy sources and vehicles. Electric vehicles (EVs), for example, use electricity to charge their batteries, while fuel cell vehicles (FCVs) are powered by hydrogen. Hydrogen is a potentially emissions-free alternative fuel produced from renewable resources. Other alternative fuels include biodiesel, renewable diesel, ethanol, natural gas, and propane. These alternative fuels can be used in advanced technology vehicles, with some already in production or development.
The US Environmental Protection Agency (EPA) has implemented programs to reduce emissions from transportation sources. The Diesel Emissions Reduction Act program offers grants and rebates to projects that improve air quality by reducing harmful emissions from diesel engines. Similarly, the Clean School Bus Program provides funding to replace existing school buses with zero-emission and low-emission models. The EPA has also set stringent emissions standards for passenger vehicles and limits on the amount of sulfur in gasoline, improving the effectiveness of emissions reduction technologies.
The SmartWay program, a collaboration between transporters, carriers, and the EPA, aims to improve supply chain efficiency and reduce air pollution from freight transportation operations. The International Maritime Organization (IMO) has designated coastal areas of North America and Western Europe as an Emission Control Area (ECA), enforcing stricter emissions and fuel standards for large ocean-going vessels.
While alternative energy sources and vehicles are being developed, transportation remains highly dependent on fossil fuels. The task of reducing CO2 emissions in the transport sector is acknowledged to be challenging. However, with increasing transport demand worldwide, the shift towards lower-carbon electricity sources and the adoption of electric vehicles offer viable options to reduce emissions from passenger vehicles.
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Frequently asked questions
The main types of pollution from transportation are air pollution and carbon pollution, which includes carbon dioxide and other greenhouse gases.
Sources of air pollution in transportation include combustion engines, fuel processing, and non-exhaust sources like tyre and brake wear. Private cars and small passenger vehicles are among the largest sources of transport-related air pollution, emitting carbon dioxide, nitrogen oxides, and particulate matter.
Transportation contributes to carbon pollution by burning fossil fuels like gasoline, diesel, and natural gas for energy. Greenhouse gas emissions from transportation account for about 28% of total U.S. greenhouse gas emissions, with road travel accounting for three-quarters of transport emissions.
Transportation-related pollution can be reduced by transitioning to electric vehicles, improving fuel efficiency, and implementing emission reduction strategies. The EPA has also set stringent emissions standards for passenger vehicles and programs like the Diesel Emissions Reduction Act offer funding to reduce harmful emissions from diesel engines.
