Bronte Wells
Cars are a major contributor to air pollution and the health consequences it causes worldwide. While it is difficult to pinpoint the exact percentage of air pollution that comes from cars, it is clear that they are a significant source of harmful emissions. The combustion of fuel in car engines produces pollutants that are released directly into the air, posing risks to human health and the environment. This includes carbon monoxide, nitrogen oxides, volatile organic compounds, and particulate matter. In addition to the direct emissions from cars, the extraction and refining of oil, as well as the production and delivery of goods and services that involve fuel, all contribute to the overall pollution output associated with car usage.
| Characteristics | Values |
|---|---|
| Carbon dioxide (CO2) emissions per gallon of gasoline | 8,887 grams |
| Carbon dioxide (CO2) emissions per gallon of diesel | 10,180 grams |
| Carbon dioxide (CO2) emissions per mile | 400 grams |
| Annual carbon dioxide (CO2) emissions | 4.6 metric tons |
| Other emissions | Methane (CH4), nitrous oxide (N2O), hydrofluorocarbon (HFC) |
| Air pollution | Hydrocarbons, oxides of nitrogen, ozone |
| Carbon monoxide (CO) | 95% of all CO emissions in cities |
| Nitrogen dioxide (NO2) | 45% attributed to the transportation sector |
| Pollutants | Smog-causing volatile organic compounds, sulfur dioxide, formaldehyde, benzene |
| Electric vehicles (EVs) emissions | Small amount of GHGs due to air conditioner/HFC leakage |
| Fuel cell electric vehicle (FCEV) emissions | Only water vapour |
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What You'll Learn
Carbon dioxide (CO2)
The combustion of gasoline leads to the separation of carbon and hydrogen. The hydrogen combines with oxygen to form water (H2O), while carbon combines with oxygen to produce CO2. This process results in significant CO2 emissions from cars, contributing to air pollution and causing health risks for individuals, particularly those residing near busy roads.
In addition to the direct emissions from fuel combustion, the production and disposal of cars also contribute to CO2 output. Electric cars, for instance, have a lower environmental impact during use but may have a less favourable production and disposal process than traditional internal combustion engine vehicles.
The impact of CO2 emissions from cars varies globally, with transport being responsible for about a quarter of the EU's total CO2 emissions in 2019, while in the US, the transportation sector accounted for about 39% of total energy-related CO2 emissions in 2023. To address these emissions, the EU has introduced new CO2 emission targets, aiming for zero emissions from new passenger cars by 2035. Similarly, the US has imposed tougher emissions standards, and consumers are increasingly seeking more efficient and environmentally-friendly vehicles.
To reduce CO2 output from cars, individuals can opt for more efficient vehicles, switch to alternative fuels, or choose electric or hybrid cars. Additionally, carpooling, using public transportation, walking, and biking can help lower emissions. These collective efforts, combined with stricter regulations and technological advancements, are crucial in mitigating the environmental and health impacts of CO2 pollution from cars.
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Carbon monoxide (CO)
CO is harmful to human health, affecting critical organs like the heart and brain. Prolonged exposure to high levels of CO can lead to poisoning and even death. People working in indoor car wash facilities, for example, are at risk of high levels of CO exposure due to poor air circulation. Similarly, those living near busy roads are also at risk as vehicles emit pollution directly into the air.
The use of catalytic converters in newer cars and trucks has helped reduce the risk of CO poisoning. These converters combine oxygen with carbon monoxide to form non-poisonous carbon dioxide, significantly lowering the concentration of CO in the exhaust. However, vehicles with defective exhaust systems or poorly tuned engines can still produce dangerous levels of CO.
To reduce exposure to CO emissions, it is recommended to avoid driving during congested "rush hour" traffic and to limit the use of automobiles by carpooling, walking, or using public transportation when possible. These actions can help reduce not only CO emissions but also other air pollutants associated with vehicle exhaust.
While cars are a significant source of CO emissions, it is important to note that other human activities, such as the production of electricity by power plants and the heating of buildings with fuels, also contribute to air pollution.
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Nitrogen dioxide (NO2)
The direct emission of NO2 from road vehicle exhaust has significantly contributed to near-road ambient NO2 concentrations in many European cities. Diesel vehicles, in particular, have dominated the emission of NO2 from road vehicles. However, it's important to note that the percentage of air pollution caused by cars varies, with higher concentrations in urban areas and near major highways.
Breathing air with high levels of NO2 can have detrimental effects on human health. High concentrations of NO2 can irritate the airways in the respiratory system, aggravate respiratory diseases like asthma, and lead to coughing, wheezing, or difficulty breathing. Prolonged exposure to elevated NO2 levels may even contribute to the development of asthma and potentially increase susceptibility to respiratory infections.
To address the issue of NO2 pollution, governments and organizations have implemented measures to reduce emissions. The US Environmental Protection Agency (EPA) has identified areas that do not meet national NO2 standards, and state and local governments are developing plans to reduce NO2 levels. Additionally, the Euro emissions standards mandate that all car manufacturers comply with maximum emission limits, contributing to the reduction of NO2 and other pollutants.
While cars are a significant source of NO2 pollution, other human activities also contribute. For example, the production of electricity by power plants and the use of fuels for heating can produce higher levels of pollution than most cars. Nevertheless, the transportation sector, including cars, is responsible for a substantial portion of NO2 emissions.
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Methane (CH4)
Cars are a major contributor to air pollution, which has significant health and environmental consequences. While the transportation sector is responsible for a large portion of pollutant emissions, the amount of pollution emitted by individual cars is generally small. The personal automobile is the single greatest polluter, and the number of cars on the road contributes significantly to the problem.
Cars emit pollutants as by-products of the combustion process and from the evaporation of fuel. When gasoline burns, carbon and hydrogen separate. The hydrogen combines with oxygen to form water (H2O), and carbon combines with oxygen to form carbon dioxide (CO2). Carbon monoxide (CO) is another pollutant emitted by cars when fuel is burned. Breathing air with a high concentration of CO affects critical organs like the heart and brain. Nitrogen dioxide (NO2) is also formed when fuel burns and nitrogen and oxygen react to form nitrogen oxides (NOx). Breathing air with high levels of NO2 can affect the respiratory system.
In addition to CO2, automobiles using gasoline produce methane (CH4) and nitrous oxide (N2O) from the tailpipe. All vehicles can emit hydrofluorocarbon (HFC) from leaking air conditioners. While the emissions of HFCs from gasoline vehicles are small compared to CO2, they have a higher global warming potential (GWP) than CO2. Electric vehicles (EVs) emit small amounts of GHGs due to air conditioner/HFC leakage.
A study of methane emissions from 30 different cars and trucks (model years 1995-1999) from four different manufacturers found that the global vehicle fleet emits 0.45 Tg of CH4 per year, representing less than 0.2% of anthropogenic CH4 emissions. The contribution of CH4 emissions from vehicles to radiative forcing of climate change is 0.3-0.4% of that of CO2 emissions from vehicles. The environmental impact of CH4 emissions from vehicles is currently negligible and is expected to remain so in the foreseeable future.
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Nitrous oxide (N2O)
Cars are a major contributor to air pollution and the health consequences it causes worldwide. Every time a car is driven, pollutants are emitted directly into the air, causing significant risks to human health, especially for people who live near busy roads, and to the environment.
N2O emissions from vehicles have a global warming impact, contributing 1-3% of the atmospheric growth rate of this species. The global vehicle fleet emits 0.18 ± 0.06 Teragrams of N2O per year, which represents 2-6% of the atmospheric growth rate of this species. This corresponds to an emission rate of 16−8 mg of N2O/km for vehicles with fuel economies of 12−6 L/100 km (20−40 mi/U.S. gal).
To reduce the presence of harmful gases in modern vehicles, car manufacturers have been working on ways to reduce N2O emissions. The Euro emissions standards, first introduced in 1992, have played a crucial role in reducing emissions. These standards dictate the maximum number of emissions that a car can legally produce and have led to the mandatory inclusion of catalytic converters.
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Frequently asked questions
The pollution output of a car varies depending on the vehicle's fuel, fuel economy, and the number of miles driven per year. A typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year.
Cars emit carbon dioxide, carbon monoxide, methane, nitrous oxide, volatile organic compounds, nitrogen oxides, sulfur dioxide, formaldehyde, and benzene.
The transportation sector is responsible for over 55% of NOx total emissions inventory in the U.S. and road travel accounts for three-quarters of transport emissions. Cars are a major contributor to air pollution, especially in urban areas and near major highways. However, it is important to note that other human activities such as the production of electricity by coal-fired power plants also contribute significantly to pollution.
