Meghan Hodges
Cars, trucks, and buses powered by fossil fuels are major contributors to air pollution. The combustion of gasoline and diesel fuel creates harmful byproducts like nitrogen dioxide, carbon monoxide, hydrocarbons, benzene, and formaldehyde. These pollutants can cause smog, heart and lung disease, and cancer. Additionally, vehicles emit carbon dioxide, the primary transportation contribution to climate change. To reduce air pollution from motor vehicles, individuals can choose cleaner vehicles, drive less, and follow speed limits and gradual acceleration practices.
| Characteristics | Values |
|---|---|
| Carbon dioxide (CO2) | 400 grams of CO2 per mile |
| Carbon monoxide (CO) | |
| Nitrogen dioxide (NO2) | |
| Nitrous oxide (N2O) | |
| Methane (CH4) | |
| Hydrocarbons (HC) | |
| Volatile Organic Compounds (VOCs) | |
| Formaldehyde | |
| Benzene | |
| Acetaldehyde | |
| 1,3-butadiene | |
| Particulate matter (PM10 and PM2.5) | |
| Ozone | |
| Fuel consumption | 1% increase in fuel consumption leads to a 1% increase in CO2 emissions |
| Speed | Driving faster emits more pollutants |
| Acceleration | Accelerating gradually burns less fuel |
| Tyre pressure | Properly inflated tires make the vehicle burn less fuel |
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What You'll Learn
Carbon dioxide
The amount of carbon dioxide emitted by a vehicle depends on factors such as fuel type, fuel economy, and mileage. On average, a typical passenger vehicle emits about 4.6 metric tons of CO2 per year, with each gallon of burned gasoline producing about 8,887 grams or 20 pounds of CO2. This means that for every mile driven, a car emits approximately 400 grams of CO2. These emissions are proportional to fuel consumption, with a 1% increase in fuel consumption resulting in a corresponding 1% increase in carbon dioxide emissions.
The growing popularity of fuel-inefficient SUVs and pickup trucks, coupled with increased driving distances, has led to surging gasoline consumption and vehicle miles traveled (VMT). As a result, carbon dioxide emissions from the transportation sector have risen significantly, with light-duty vehicles like passenger cars, trucks, and SUVs accounting for 57% of transportation sector GHG emissions in the US. In California, these vehicles contribute to an even higher proportion, making up 70% of the state's transportation sector emissions.
To address these environmental concerns, several states and countries are phasing out gasoline and transitioning to electric vehicles. Electric trucks and buses have significantly lower global warming emissions than their fossil fuel-powered counterparts. Additionally, newer vehicles tend to emit less pollution due to stricter emission standards and improved fuel efficiency. However, older vehicles with degraded emission control technology may emit more pollution, underscoring the ongoing need for cleaner transportation solutions.
To make informed choices, consumers can refer to resources like the Green Vehicle Guide (GVG) in Australia, which provides information on fuel consumption and CO2 emissions for different vehicle models. The GVG ranks vehicles based on their combined CO2 value, with a higher CO2 number indicating greater carbon dioxide emissions. By choosing more efficient vehicles, consumers can play a role in reducing carbon dioxide emissions from the transportation sector.
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Nitrogen dioxide
NO2 is a harmful pollutant that is emitted from the exhausts of road vehicles, particularly diesel engines. The direct emission of NO2 from vehicle exhausts has significantly contributed to near-road ambient concentrations of NO2 in many European cities. Diesel vehicles, with their use of emission control technologies such as Diesel Oxidation Catalysts, have been the primary source of NO2 emissions.
The harmful effects of nitrogen dioxide on human health have been well-documented. Nitrogen oxides, including NO2, have direct and indirect impacts. They can directly affect human health and also damage agricultural crops and ecosystems. These indirect effects can, in turn, have further consequences for human health and food security.
To address the problem of NO2 emissions, regulations and standards have been implemented. Vehicle NOx emissions have been regulated since the 1960s, and the Euro emissions standards, introduced in 1992, have played a crucial role in reducing overall emissions from vehicles. These standards dictate the maximum number of emissions that a car can legally produce and have led to an 84% reduction in nitrogen oxide emissions as of 2017.
In addition to regulations, technological advancements have been made to minimize NO2 emissions. Modern gasoline-engine vehicles are equipped with three-way catalytic converters, which effectively reduce NOx in the exhaust by converting it into nitrogen and water and/or carbon dioxide. While these converters have been successful, the problem of NOx emissions persists, especially with older vehicles and diesel engines, which produce NO2 in higher volumes.
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Carbon monoxide
Breathing air with a high concentration of CO can be particularly concerning for people with heart disease. In addition to vehicles, a variety of household items such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves also release CO and can affect indoor air quality.
CO is one of the six air pollutants controlled by the EPA's National Ambient Air Quality Standards (NAAQS). To reduce pollution from motor vehicles, individuals can opt to drive cleaner vehicles, drive less, and drive smarter by observing speed limits and accelerating gradually.
While electric vehicles (EVs) emit small amounts of greenhouse gases due to air conditioner/HFC leakage, they do not produce tailpipe emissions, including carbon monoxide.
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Nitrous oxide
The emission of nitrous oxide from vehicles has negative consequences for both human health and the environment. Studies have linked NOx emissions to respiratory and cardiovascular mortality, as well as adverse effects on ecosystems and agricultural crops. In 2015, Volkswagen was at the centre of a scandal ("dieselgate") where it was discovered that their cars produced up to 40 times more nitrogen oxide than reported. This incident brought the damaging effects of nitrogen oxide pollution on public health into sharp focus.
The primary challenge in addressing nitrous oxide emissions from vehicles is twofold: minimising the amount of NOx created and removing it from the exhaust. Lowering combustion temperature is key to reducing NOx formation, as higher temperatures accelerate the rate of NOx production. Aftertreatment devices can also be employed to induce a chemical reaction, converting NOx in the exhaust into nitrogen and water and/or CO2.
It is important to note that while nitrogen oxide pollution is harmful, nitrogen itself is not harmful to humans. Nitrogen constitutes 80% of our atmosphere, but when it bonds with oxygen, it becomes problematic. Additionally, nitrous oxide should not be confused with nitrogen oxide, which is commonly associated with racing cars and is injected into the engine to produce a burst of speed.
To summarise, nitrous oxide is a significant vehicle emission that contributes to global warming and has detrimental effects on human health and the environment. Efforts to reduce NOx emissions focus on lowering combustion temperatures and utilising aftertreatment devices to remove NOx from vehicle exhaust.
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Methane
Cars emit several pollutants, including carbon dioxide (CO2), nitrous oxide (N2O), and methane (CH4). Methane is a greenhouse gas emitted by vehicles that contributes to the warming of the Earth's atmosphere and subsequent climate change. While the environmental impact of methane emissions from vehicles is considered negligible, it is still important to understand its role in the broader context of climate change.
According to the United States Environmental Protection Agency (EPA), a typical passenger vehicle emits about 4.6 metric tons of carbon dioxide annually. While this is a significant amount, it is important to note that vehicles also produce other greenhouse gases, such as methane and nitrous oxide. The EPA estimates that the global vehicle fleet emits approximately 0.45 Tg of methane per year, which represents less than 0.2% of anthropogenic methane emissions.
The impact of methane emissions from vehicles on climate change is relatively small compared to other sources of methane emissions and other greenhouse gases. However, it is still a contributing factor to the overall warming of the planet. The contribution of methane emissions from vehicles to radiative forcing of climate change is estimated to be between 0.3% and 0.4% of that of carbon dioxide emissions from vehicles.
While the direct environmental impact of methane emissions from vehicles might be negligible, it is important to consider the broader implications. Methane is a potent greenhouse gas, with a higher global warming potential than carbon dioxide. This means that, while the emissions from individual vehicles might seem small, the collective impact of the global vehicle fleet can contribute to the overall warming of the planet. Additionally, methane emissions from vehicles can interact with other greenhouse gases and pollutants, potentially exacerbating their effects.
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Frequently asked questions
Cars emit a variety of pollutants, including carbon dioxide, carbon monoxide, nitrogen dioxide, hydrocarbons, benzene, and formaldehyde. These pollutants can cause smog, heart and lung disease, and cancer.
Carbon dioxide (CO2) is the main greenhouse gas produced by motor vehicles. It is emitted from the tailpipes of cars, trucks, and buses, and accounts for over one-fifth of the United States' total global warming pollution.
Cars emit pollutants through the combustion of fuel in their engines, and through the evaporation of fuel.
