Brian Barton
Cars are a major source of air pollution, which refers to the presence of foreign substances in the air or excessive amounts of certain impurities. The burning of gasoline and diesel fuel in cars releases harmful by-products, such as nitrogen dioxide, carbon monoxide, hydrocarbons, benzene, and formaldehyde. These emissions contribute to global warming, air pollution, and climate change, causing respiratory problems and other health issues. Greenhouse gases emitted by vehicles, particularly carbon dioxide, trap heat in the atmosphere, leading to rising temperatures, sea levels, and an increase in natural disasters. While ozone in the upper atmosphere protects us from ultraviolet rays, ground-level ozone contributes to smog. Electric vehicles are becoming a cleaner alternative, but emissions are still produced during the production and distribution of electricity.
| Characteristics | Values |
|---|---|
| Carbon dioxide (CO2) | 8,887 grams of CO2 per gallon of gasoline |
| Carbon monoxide (CO) | 95% of all CO emissions in cities may come from motor vehicle exhaust |
| Nitrogen dioxide (NO2) | |
| Hydrocarbons | |
| Benzene | |
| Formaldehyde | |
| Sulfur dioxide (SO2) | Produced by burning sulfur-containing fuels, especially diesel and coal |
| Particulate matter | |
| Volatile organic compounds (VOCs) | Come from diesel emissions and the burning of gasoline |
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What You'll Learn
Carbon dioxide (CO2) emissions
Carbon dioxide (CO2) is a greenhouse gas emitted by cars, trucks, and buses when they burn gasoline or diesel. While CO2 is not directly harmful and is essential for life on Earth, human activities like burning fossil fuels have led to excessive atmospheric CO2 levels, causing global warming and climate change.
According to the US Environmental Protection Agency, a typical passenger vehicle emits about 4.6 metric tons of CO2 annually, assuming an average fuel economy of 22.2 miles per gallon and 11,500 miles driven per year. Every gallon of burned gasoline releases approximately 8,887 grams of CO2, while diesel produces around 10,180 grams. These emissions vary based on fuel type, fuel economy, and distance travelled.
CO2 emissions from road transport are a significant concern. In 2019, transport accounted for about a quarter of the EU's total CO2 emissions, with 71.7% coming from road transportation. Passenger cars alone contributed 61% of this road transport figure. Similarly, in the US, road transport accounts for 15% of total CO2 emissions, with passenger vehicles and freight trucks responsible for 45.1% and 29.4%, respectively.
To reduce carbon dioxide emissions from vehicles, individuals can switch to electric vehicles, which produce zero tailpipe emissions. However, emissions are generated during the production and distribution of the electricity used to power these vehicles. Nevertheless, with the increasing adoption of renewable energy sources, electric vehicles are becoming an increasingly cleaner alternative.
On a broader scale, the EU is introducing 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. These legislative efforts, combined with technological advancements, are crucial steps towards mitigating the environmental impact of carbon dioxide emissions from vehicles.
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Carbon monoxide (CO) emissions
Carbon monoxide (CO) is a highly toxic, colourless, and odourless gas that is produced by the incomplete burning of fuels such as propane, coal, wood, oil, kerosene, natural gas, and gasoline. The internal combustion engine, a primary component of gasoline-fuelled automobiles, is one of the most common sources of carbon monoxide.
When cars burn gasoline, they emit carbon monoxide. According to the Environmental Protection Agency, up to 95% of all carbon monoxide emissions in cities may come from motor vehicle exhaust. The Environmental Defense Fund estimates that transportation causes nearly 27% of greenhouse emissions, with vehicle pollution contributing to global warming.
The typical internal combustion engine found in most cars and trucks can produce high concentrations of carbon monoxide. While changes in engine design, fuel, and emission control devices have reduced carbon monoxide emissions, faulty or poorly maintained exhaust systems can lead to increased levels within the vehicle's cabin. Operating a vehicle with a defective exhaust system or a poorly tuned engine can result in dangerous levels of carbon monoxide exposure. Driving with the trunk lid or rear tailgate open, or with holes in the car body, can also increase exposure.
To reduce carbon monoxide emissions, it is important to maintain proper vehicle maintenance and follow best practices when operating a motor vehicle. Additionally, switching to an electric vehicle can help reduce carbon monoxide and other vehicle emissions.
Overall, carbon monoxide emissions from vehicles contribute significantly to air pollution and have harmful effects on human health and the environment. It is important to take steps to reduce these emissions and mitigate their impact.
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Nitrogen dioxide (NO2) emissions
Nitrogen dioxide (NO2) is a harmful gas emitted from car exhausts. It is formed when fuel burns, causing nitrogen and oxygen to react and form nitrogen oxides (NOx). NO2 emissions from cars are a significant contributor to air pollution, particularly in urban areas. The direct emission of NO2 from road vehicle exhaust has been a notable factor in the high near-road ambient concentrations of NO2 in many European cities. Diesel vehicles, in particular, have dominated the emission of NO2 from road vehicles.
The negative effects of nitrogen oxide on public health are well-documented. The UK's Committee on the Medical Effects of Air Pollutants has linked long-term exposure to NO2 with respiratory and cardiovascular mortality, children's respiratory symptoms, and lung function. Additionally, nitrogen oxides (NOx) damage the human respiratory system and contribute to acid rain.
To address the issue of NO2 emissions, various measures have been implemented. The Euro emissions standards, introduced in 1992, mandate car manufacturers to comply with maximum emission limits. As a result, nitrogen oxide emissions have significantly decreased since 2001. The US Environmental Protection Agency (EPA) has also established national and regional rules to reduce NO2 and NOx emissions, helping state and local governments meet the National Ambient Air Quality Standard (NAAQS).
Furthermore, individuals can play a role in reducing NO2 emissions by transitioning from gasoline-powered vehicles to cleaner alternatives, such as electric cars. This is crucial in lowering overall emissions and mitigating the impact of global warming. While newer cars produce more carbon dioxide than older models, they emit considerably fewer nitrogen oxides.
Overall, NO2 emissions from cars have been a significant environmental and public health concern. By implementing regulations, adopting cleaner technologies, and making informed choices, we can collectively work towards reducing NO2 emissions and improving air quality.
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Particulate matter
PM2.5, a type of fine particulate matter, mainly originates from combustion emissions. On-road transportation is considered one of the primary sources of PM2.5 emissions. The relationship between on-road transportation and PM2.5 concentration varies temporally and spatially, and the estimation of this variation is important for policymaking. Approximately 3605 premature deaths were attributed to PM2.5 from on-road transportation in 2010, and about a total of 50,223 premature deaths were attributed to PM2.5 from 2003 to 2016.
Several diseases of the pulmonary, cardiac, vascular, and neurological systems are related to PM2.5. Large-scale epidemiological studies associate traffic-related PM with impaired cognitive functions and an increased incidence of neurodegenerative diseases such as Alzheimer's disease. Inhaled components of PM may directly invade the brain via the olfactory route or act through peripheral system responses resulting in inflammation and oxidative stress in the brain.
To reduce particulate matter pollution from vehicles, it is necessary to reduce the amount of gasoline and diesel used. Switching to an electric vehicle can be effective in reducing vehicle pollution and saving money. Electricity is becoming cleaner every year, as more of it comes from renewable sources like the sun and wind. In all 50 states, the annual emissions from an electric vehicle are less than those of a gas car.
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Greenhouse gas emissions
A typical passenger vehicle emits about 4.6 metric tons of CO2 per year, although this can vary depending on the vehicle's fuel, fuel economy, and annual mileage. For example, a car with a fuel economy of 22.2 miles per gallon that drives 11,500 miles per year will fall close to this average. Every gallon of gasoline burned produces about 8,887 grams of CO2, which is equivalent to approximately 20 pounds. This CO2 remains in our atmosphere for thousands of years, with the oceans absorbing about 90% of the extra heat generated. However, with the recent unprecedented rise in ocean temperatures, it is feared that the oceans may have reached their limit.
The transportation sector, which includes cars, trucks, aircraft, and railroads, is a major contributor to greenhouse gas emissions. In the United States, transportation accounted for the largest portion (27-28%) of total greenhouse gas emissions in 2022. Cars play a significant role in this, with the Environmental Protection Agency estimating that vehicles cause nearly 75% of carbon monoxide pollution in the country.
To reduce greenhouse gas emissions from vehicles, a transition from gasoline-powered cars to electric vehicles is crucial. Electric vehicles produce zero tailpipe emissions, although emissions are still created during the production and distribution of the electricity used to power them. Nevertheless, electricity is becoming cleaner, with an increasing proportion of it generated from renewable sources. Additionally, consumers can make more environmentally conscious choices when purchasing a vehicle by referring to guides that provide information on pollution levels and relative cleanliness.
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Frequently asked questions
Cars emit carbon dioxide, carbon monoxide, nitrogen dioxide, hydrocarbons, benzene, and formaldehyde.
Cars emit pollutants through the burning of gasoline and diesel fuel, which creates harmful byproducts from the combustion process (exhaust) and the evaporation of the fuel itself.
These pollutants contribute to global warming, air pollution, and climate change. They also pose health risks, such as respiratory problems, and can even cause premature death.
