Brian Barton
Cars are a major contributor to air pollution, with vehicles causing nearly 75% of carbon monoxide pollution in the United States, according to the Environmental Protection Agency. The burning of gasoline produces harmful emissions, with a typical passenger vehicle emitting about 4.6 metric tons of carbon dioxide per year. This is dependent on the vehicle's fuel, fuel economy, and the number of miles driven annually. The production and distribution of gasoline also contribute to pollution, as does the extraction, refining, and transportation of oil. Electric vehicles (EVs) have gained popularity, offering a cleaner alternative with zero tailpipe emissions. However, emissions are still generated during the production and distribution of the electricity used to power these vehicles. The transportation sector is responsible for a significant portion of global emissions, with road travel accounting for three-quarters of transport emissions. Passenger cars are a major polluter, contributing 45.1% of these emissions, while trucks carrying freight account for 29.4%. To reduce pollution, individuals can opt for more fuel-efficient vehicles, switch to electric cars, or simply drive less.
| Characteristics | Values |
|---|---|
| Average carbon dioxide emissions per year | 4.6 metric tons |
| Average carbon dioxide emissions per mile | 400 grams |
| Carbon dioxide emissions from burning one gallon of gasoline | 8,887 grams |
| Carbon dioxide emissions from burning one gallon of diesel | 10,180 grams |
| Percentage of air pollution caused by cars in urban areas | Higher than other areas |
| Percentage of air pollution caused by cars near major highways | Higher than in urban areas |
| Number of deaths caused by vehicle pollution in the US each year | 17,000 to 20,000 |
| Percentage of people exposed to unhealthy air in the US | One in three |
| Average occupancy rate of cars in Europe in 2018 | 1.6 people per car |
| Share of new registered passenger vehicles in Europe that were electric in 2021 | 17.8% |
| Highest-rated EPA combined fuel economy for gasoline vehicles in model year 2023 | 60 miles per gallon |
| Highest-rated EPA combined fuel economy for EVs in model year 2023 | 140 miles per gallon |
| Percentage of carbon monoxide pollution in the US caused by vehicles | 75% |
| Percentage of greenhouse emissions caused by transportation | 27% |
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What You'll Learn
Cars emit 4.6 metric tons of carbon dioxide per year
Cars are a major contributor to air pollution. In the US, 17,000 to 20,000 people die each year from vehicle pollution, with people of colour disproportionately affected. Exposure to toxic air pollutants is higher inside vehicles than outside.
A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This number can vary based on a vehicle's fuel, fuel economy, and the number of miles driven per year. The average gasoline vehicle has a fuel economy of about 22.2 miles per gallon and drives around 11,500 miles per year. Every gallon of gasoline burned creates about 8,887 grams of CO2.
In addition to carbon dioxide (CO2), automobiles using gasoline produce methane (CH4) and nitrous oxide (N2O) from the tailpipe. All vehicles can emit hydrofluorocarbon (HFC) from leaking air conditioners. Gasoline vehicles also produce GHGs during the production and distribution of gasoline. Electric vehicles (EVs) have no tailpipe emissions, but emissions are created during the production and distribution of the electricity used to fuel the vehicle.
The US transportation sector accounted for about 39% of total US energy-related CO2 emissions in 2023. The US government has imposed tougher emissions standards, and consumers increasingly demand better efficiency. Hybrid and electric cars, as well as alternative fuels, will help reduce emissions.
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Electric vehicles produce no tailpipe emissions
Cars are a major contributor to air pollution. The average passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This number varies depending on the vehicle's fuel, fuel economy, and the number of miles driven per year. In addition to carbon dioxide, vehicles emit methane, nitrous oxide, and hydrofluorocarbon from leaking air conditioners. These emissions have severe health consequences, including cancer, asthma, eye irritation, poisoning, heart disease, and birth defects.
Electric vehicles (EVs) produce no tailpipe emissions, which means they emit no pollutants from their exhaust pipes during operation. However, emissions are created during the production and distribution of the electricity used to power EVs. The amount of carbon pollution generated during electricity production depends on the energy source, with coal and natural gas resulting in higher emissions compared to renewable sources like wind or solar power.
Despite the emissions associated with electricity production, EVs are generally responsible for lower levels of greenhouse gases (GHGs) than traditional gasoline vehicles. This is because EVs have zero tailpipe emissions, resulting in significantly lower GHGs during operation. The higher the adoption of renewable energy sources for electricity generation, the lower the total GHGs associated with EVs.
While it's true that manufacturing an EV can create more carbon pollution than manufacturing a gasoline car due to the energy-intensive battery production, this disadvantage is offset over time. After about 1.4 to 1.9 years of use, EVs become cleaner than gasoline cars in terms of total GHG emissions, including manufacturing and operational emissions.
In addition to reduced pollution, EVs offer other environmental benefits. They produce zero direct emissions, whereas conventional vehicles with internal combustion engines (ICEs) produce direct emissions through the tailpipe and evaporation from the fuel system. EVs also have a longer lifespan, with some electric vehicle batteries lasting over 400,000 miles. As a result, EVs are becoming increasingly popular, and the electric grid is expected to get cleaner over time as the world shifts towards renewable energy sources.
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Cars are deadlier in the US than in other countries
Cars are a major contributor to air pollution. A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This number varies based on the vehicle's fuel, fuel economy, and the number of miles driven annually. In addition to carbon dioxide, vehicles emit methane, nitrous oxide, and hydrofluorocarbon from leaking air conditioners. These emissions have serious health implications, including cancer, asthma, eye irritation, poisoning, heart disease, and birth defects.
In the US, 17,000 to 20,000 people die annually from vehicle pollution, with people of color disproportionately affected. California has some of the worst air quality in the country, with nine out of ten Californians living in areas with unhealthy air due to vehicle emissions.
The weight of vehicles is also a critical factor in road fatalities. The heavier a vehicle, the greater the impact in a collision. Data from The Economist reveals that for every 10,000 crashes, the heaviest vehicles killed 37 people in the other car, compared to 5.7 for cars of median weight and 2.6 for the lightest. The popularity of large SUVs and pickup trucks in the US has contributed to a rise in road deaths. The average new vehicle in America weighs more than 4,400 pounds, significantly more than in the European Union (3,300 pounds) and Japan (2,600 pounds).
The Ford F-Series pickup is the most-often crashed vehicle in America, involved in over 10,000 fatal crashes over a five-year study period. Pickups and SUVs are linked to higher fatality risks in pedestrian crashes, with tall trucks and SUVs found to be 45% deadlier to US pedestrians.
While electric vehicles (EVs) have no tailpipe emissions, their production and distribution can create emissions. However, electricity is becoming cleaner, and EVs are generally cleaner over their lifetime.
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Cars, trucks, and buses emit nitrogen dioxide
NO2 is a significant contributor to air pollution, which is particularly prominent in urban areas and near major highways. The percentage of air pollution caused by vehicles is higher in these regions. While improvements in fuel technology and emissions standards have led to cleaner cars, the increasing number of vehicles on the road offsets these advancements.
The production and distribution of gasoline also contribute to emissions. This includes extracting oil, transporting it to refineries, refining the oil, and delivering the gasoline to service stations. Electric vehicles (EVs) have gained popularity as a solution to reduce emissions, as they produce zero tailpipe emissions. However, emissions are still generated during the production and distribution of the electricity used to power these vehicles.
In the United States, light-duty vehicles, such as passenger cars, trucks, and SUVs, account for 57% of transportation sector GHG emissions. California, in particular, faces significant air quality issues, with vehicles being the largest source of carbon monoxide and nitrogen oxide pollution. The Biden administration has proposed new standards for cars, SUVs, and light trucks to reduce greenhouse gases and pollutants, aiming for levels below 1% of those set in 1970.
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Cars are a major cause of air pollution
A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide annually, assuming an average gasoline vehicle with a fuel economy of 22.2 miles per gallon and an annual mileage of 11,500 miles. Each gallon of burned gasoline produces about 8,887 grams of carbon dioxide, contributing to the overall carbon footprint of cars. In addition to carbon dioxide, gasoline-powered vehicles emit methane, nitrous oxide, and hydrofluorocarbon from leaking air conditioners, further exacerbating the pollution problem.
The impact of car pollution is particularly acute in urban areas and near major highways, where the concentration of pollutants is higher. This has severe health consequences, including an increased risk of cancer, asthma, eye irritation, poisoning, heart disease, and birth defects. Additionally, vehicle pollution contributes to global warming by releasing greenhouse gases that heat the planet and deplete the ozone layer, leading to rising global temperatures, sea levels, and an increase in natural disasters.
To address these issues, governments and organizations are implementing measures to reduce emissions and improve air quality. The U.S. government has imposed stricter emissions standards, and consumers are demanding better fuel efficiency. The European Union (EU) has set targets to reduce harmful emissions from passenger cars and light commercial vehicles, aiming for zero CO2 emissions by 2035. The transition to electric vehicles (EVs) is also gaining momentum, with sales of EVs surging and offering a cleaner alternative to traditional gasoline-powered cars.
While cars are a significant contributor to air pollution, it is important to recognize that other factors, such as agriculture and natural causes, also play a role in overall air pollution levels. Additionally, single-occupancy vehicles exacerbate the problem, and promoting car-sharing, public transportation, walking, and biking can help reduce the number of vehicles on the road and, consequently, their environmental impact.
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Frequently asked questions
A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This number can vary based on a vehicle’s fuel, fuel economy, and the number of miles driven per year.
Air pollutants emitted from cars are believed to cause cancer and contribute to health problems such as asthma, heart disease, birth defects, and eye irritation. Exposure to harmful toxic air pollutants from vehicles is higher inside vehicles than outside.
Vehicle pollution contributes to global warming as greenhouse gases heat the planet and deplete the ozone layer. This causes the average global temperature to rise, leading to rising sea levels and an increase in natural disasters.
To reduce carbon dioxide pollution and air pollution from vehicles, we need to reduce how much gasoline and diesel we use. People can switch to electric vehicles, walk, bike, carpool, or use public transportation.
