Helena Joyce
Motor vehicles are a significant source of air pollutants, particularly in areas with heavy traffic. While individual car emissions are generally small, the large number of vehicles on the road contributes significantly to air pollution. The primary criteria pollutants resulting from vehicles are carbon monoxide, nitrogen oxides, volatile organic compounds, particulate matter, hydrocarbons, and toxic pollutants such as benzene and formaldehyde. These emissions have been linked to adverse health effects, including respiratory and cardiovascular diseases, and an increased risk of cancer. Additionally, carbon dioxide emissions from vehicles contribute to climate change, leading to more frequent and intense weather events and health risks associated with rising temperatures.
| Characteristics | Values |
|---|---|
| Pollutants | Carbon monoxide (CO), Nitrogen dioxide (NO2), Nitrogen oxides (NOx), Hydrocarbons, Particulate matter (PM), Volatile organic compounds (VOCs), Semi-volatile organic compounds (SVOCs), Polycyclic aromatic hydrocarbons (PAHs), Benzene, Acetaldehyde, Methane, Fluorinated refrigerants, Sulfur dioxide (SO2), Lead, SOx |
| Health Effects | Asthma, Emphysema, Bronchitis, Heart disease, Lung disease, Cancer, Blood disorders, Impaired fertility, Risk of premature death |
| Environmental Effects | Climate change, Acid rain, Deteriorated water quality, Ground-level ozone, Air toxics, Haze, Polluted waters, Contaminated farmland and natural ecosystems |
| Vehicle Types | Cars, Buses, Trucks, Off-highway vehicles (e.g. construction vehicles, boats), SUVs, Pick-up trucks |
| Fuel Types | Gasoline, Diesel, Fossil fuels |
| Emission Factors | Mileage, Age of vehicle, Fuel consumption, Fuel standards, Temperature, Traffic congestion |
| Standards and Regulations | Euro level standards, US Clean Air Act, Ultra-low sulfur diesel regulations, Fuel quality standards |
| Solutions | Cleaner transportation, Electric vehicles, Improved fuel efficiency, Stronger fuel economy standards, High-efficiency filters |
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What You'll Learn
Carbon dioxide (CO2) emissions
Carbon dioxide (CO2) is a greenhouse gas emission that is released from vehicles. It is the main greenhouse gas produced by motor vehicles, contributing to climate change. CO2 emissions from vehicles are essentially proportional to fuel consumption and inversely proportional to fuel economy. For every 1% increase in fuel consumption, there is a corresponding 1% increase in carbon dioxide emissions. About 19.4 pounds of CO2 are produced for every gallon of gasoline combusted. A typical passenger vehicle emits about 400 grams of CO2 per mile, or about 4.6 metric tons of CO2 per year. This can vary depending on the vehicle's fuel, fuel economy, and the number of miles driven per year. Electric vehicles, on the other hand, have no tailpipe emissions, but emissions are created during the production and distribution of the electricity used to fuel them.
The transportation sector, including vehicles, is a significant contributor to global CO2 emissions. Transport accounts for around one-fifth of global CO2 emissions, with road transport representing three-quarters of this amount. Passenger vehicles, such as cars and buses, contribute to 45.1% of road transport emissions, while trucks carrying freight make up the remaining 29.4%. In the EU, transport was responsible for about a quarter of total CO2 emissions in 2019, with 71.7% coming from road transportation.
To reduce CO2 emissions from vehicles, there are two main approaches: improving vehicle efficiency and transitioning to alternative fuels. Electric vehicles, for example, are gaining popularity and are proven to be cleaner than vehicles running on petrol. The EU has introduced new CO2 emission targets, aiming for zero emissions from new passenger cars and light commercial vehicles by 2035. Intermediate targets for 2030 are set at a 55% reduction for cars and 50% for vans.
In addition to electric vehicles, other technological innovations can help reduce emissions from road transport. Hydrogen technologies, for instance, are being explored for their potential to decarbonize the transport sector. The IEA's "Sustainable Development Scenario" outlines a path toward net-zero CO2 emissions from global energy by 2070, with motorcycles, rail, and small trucks expected to be phased out by 2040, 2050, and 2060, respectively.
While efforts are being made to reduce CO2 emissions from vehicles, it is important to recognize that vehicles are not the only source of these emissions. The production and disposal of vehicles, especially in the case of electric cars, can also contribute to CO2 emissions. Additionally, the electricity used to fuel electric vehicles may be generated through the burning of fossil fuels, which produces CO2. Therefore, a comprehensive approach to reducing emissions must consider the entire lifecycle of vehicles and the energy systems that support them.
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Nitrogen oxides (NOx)
The diverse, mobile, and reactive nature of NOx enables it to contribute to various environmental issues. NOx is a precursor to smog, which is already a significant problem in California. These nitrogen oxides play a role in the formation of acid rain and the depletion of ozone, leading to increased UV radiation reaching the Earth's surface. Additionally, NOx contributes to climate change, deteriorated water quality, air toxics, and particulate matter.
The health impacts of NOx are significant, particularly at near-surface elevations. NOx can aggravate respiratory conditions such as asthma, emphysema, bronchitis, and lung disease. It is also associated with increased risks of heart disease and respiratory illnesses. The particulate matter resulting from NOx can carry toxic compounds, contributing to haze and polluting freshwater and coastal waters, as well as contaminating farmland and natural ecosystems.
While motor vehicles are a major contributor to NOx emissions, it is important to note that NOx is also produced naturally by lightning. The occurrence of lightning-produced NOx depends on the season and geographic location, with higher occurrences near the equator during the summer months. Additionally, agricultural fertilization and the use of nitrogen-fixing plants contribute to atmospheric NOx levels by promoting nitrogen fixation by microorganisms.
To address the issue of NOx emissions from vehicles, newer vehicles are generally designed to emit less pollution. Stricter emission standards and improvements in emission control technology, such as catalytic converters, have contributed to reducing NOx emissions over time. Additionally, vehicle models that meet higher air pollution standards, such as the 'Euro level' standards, produce lower NOx emissions than those meeting lower standards.
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Volatile organic compounds (VOCs)
VOCs are also emitted from the interior furnishing materials of vehicles and the infiltration of engine exhausts and other exterior environmental pollutants. VOC concentrations can be affected by factors such as vehicle model, driving speed, air exchange rate, temperature, and types of substances with different boiling points inside the vehicles. For example, exposure to direct sunlight can increase the interior temperature, causing the volatilization of various chemical substances.
VOCs can include compounds such as benzene, toluene, ethylbenzene, xylenes, styrene, butyl acetate, and undecane, which can adversely affect the health of drivers and passengers. VOCs have been found to deteriorate vehicle interior air quality (VIAQ) and pose risks to human health.
To address this issue, new monitoring devices are being developed to detect VOCs at low concentrations and identify those that are harmful to human health and comfort. Microfluidic gas detectors, for instance, offer a cost-effective, compact, and simple solution for the detection of VOCs in vehicles.
Additionally, improvements in vehicle sealing/insulation systems, air filters, and climatic actuators have helped mitigate the infiltration of outdoor air pollutants, contributing to better in-cabin air quality.
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Particulate matter (PM)
PM2.5 is primarily generated from combustion emissions, with on-road transportation being a significant contributor. The impact of on-road transportation on PM2.5 levels varies across different locations and time periods. Studies have found that an increase of 6.17 billion kilometres of on-road transportation per square kilometre is associated with a 1-microgram/cubic metre increase in PM2.5 concentration in the contiguous United States. This impact is relatively small, with on-road transportation contributing an average of only 1.09% to PM2.5 levels.
The health effects of PM2.5 exposure are well-documented. It has been linked to adverse health outcomes, particularly in individuals with pre-existing respiratory and cardiovascular conditions. Exposure to PM2.5 can aggravate asthma, emphysema, bronchitis, heart disease, and lung disease. Additionally, PM2.5 can act as a carrier for toxic compounds, contributing to haze and the pollution of fresh and coastal waters. It also contaminates farmland and natural ecosystems.
The impact of PM2.5 exposure on public health varies across different populations. Studies have found that certain racial and ethnic groups, such as Asian Americans, African Americans, and Latinos, are disproportionately affected by PM2.5 pollution from vehicles. These groups tend to reside in areas with higher exposure to PM2.5, leading to increased health risks.
While on-road transportation is a contributor to PM2.5 levels, it is important to note that other sources, such as industrial, agricultural, construction, and off-road transportation activities, also play a significant role in overall air pollution levels. Therefore, addressing PM2.5 pollution requires a comprehensive approach that considers multiple sources and implements effective policies to reduce emissions.
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Hydrocarbons
Over the past 30–40 years, vehicle tailpipe emissions of these pollutants have decreased significantly due to advanced emission after-treatment technologies and stricter regulations. However, vehicles remain a major source of air pollutants, especially in areas with more traffic congestion, such as urban areas. The personal automobile is the single greatest contributor to hydrocarbon and nitrogen oxide pollution.
To meet the increasingly stringent emission standards, manufacturers have improved engine and vehicle technology. This includes designing highly efficient combustion systems, introducing vapor recovery systems, using computer technologies to optimise engine performance, and developing effective "after-treatment" technologies such as catalytic converters and particulate filters.
While zero-emission vehicles (ZEVs) do not produce tailpipe emissions, they are not entirely zero-emission when considering upstream electricity generation emissions. However, ZEVs still contribute to reducing roadside emissions and improving local air quality.
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Frequently asked questions
Criteria pollutants that result from vehicles include carbon monoxide, nitrogen oxides, sulfur dioxide, particulate matter, volatile organic compounds, hydrocarbons, and benzene.
Carbon dioxide (CO2) is the main greenhouse gas emitted by vehicles.
Vehicle emissions have been linked to adverse effects on nearly every organ system in the body. Health risks include respiratory and cardiovascular diseases, lung irritation, and an increased risk of cancer.
NOx contributes to numerous environmental issues such as acid rain, climate change, deteriorated water quality, ground-level ozone, air toxics, and particulate matter.
Yes, newer vehicles generally emit less pollution due to stricter emission standards and improved emission control technology. However, the growing popularity of less fuel-efficient vehicles and increased driving distances can offset these gains.
