Brian Barton
Cars are a major source of air pollution, which refers to the presence of foreign substances in the air that do not belong or excessive amounts of certain impurities. Cars emit pollutants from burning fuel in their engines, and these pollutants are released through the exhaust. These pollutants include nitrogen oxides, carbon monoxide, volatile organic compounds, sulfur dioxide, formaldehyde, benzene, and particulate matter. These emissions contribute to global warming, climate change, and health issues such as lung irritation, weakened defenses against respiratory infections, and increased risks for people living near busy roads. Electric vehicles (EVs) have no tailpipe emissions, but emissions are created during the production and distribution of the electricity used to fuel them.
| Characteristics | Values |
|---|---|
| Type of pollution | Air pollution, carbon dioxide pollution, ozone pollution |
| Source of pollution | Exhaust from burning fuel, evaporation of fuel |
| Pollutants | Carbon monoxide, nitrogen oxides, sulfur dioxide, volatile organic compounds, particulate matter, hydrocarbons, benzene, formaldehyde |
| Health risks | Lung irritation, weakened defenses against respiratory infections, asthma, heart issues, impaired lung development, intensified allergic reactions, leukemia, blood disorders, infertility |
| Environmental risks | Global warming, climate change, acid rain, deteriorated water quality, soil acidification |
| Solutions | Carpooling, walking, public transportation, fuel-efficient vehicles, electric vehicles, hybrid vehicles, low-carbon fuels |
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What You'll Learn
Carbon monoxide
The lethal effects of carbon monoxide in engine exhaust are well-documented. Hundreds of people die each year from carbon monoxide poisoning caused by a running vehicle, often in enclosed spaces like garages. Even with the garage door open, the catalytic converter in cars may be ineffective in such enclosed spaces when there is insufficient oxygen. Operating a vehicle with a defective exhaust system, driving with the trunk lid or rear tailgate open, or with holes in the car body can all lead to dangerous levels of carbon monoxide exposure.
The symptoms of carbon monoxide poisoning include throbbing headaches, disorientation, drowsiness, unconsciousness, and convulsions. Prolonged exposure can lead to death. To protect against carbon monoxide exposure, it is recommended to install a 12v carbon monoxide monitor in your vehicle to detect any exhaust vapours. Additionally, if you suspect CO is entering your vehicle, have it evaluated by a professional mechanic or technician.
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Nitrogen oxides
NOx emissions from vehicles have been regulated since the 1960s, as they have harmful effects on both human health and the environment. They can irritate the airways in the human respiratory system, aggravating respiratory diseases and leading to coughing, wheezing, and difficulty breathing. Prolonged exposure to high concentrations of NO2 may even contribute to the development of asthma and increase susceptibility to respiratory infections.
In addition to their direct impact on human health, nitrogen oxides also have indirect effects. They can damage agricultural crops and ecosystems, and they react with other pollutants in the presence of sunlight to form ground-level ozone, a key ingredient in smog.
To mitigate the harmful effects of NOx, several strategies are employed. Lowering combustion temperature during the fuel combustion process helps to reduce the formation of NOx. Aftertreatment devices, such as three-way catalytic converters, can also be used to chemically convert NOx into nitrogen, water, and/or carbon dioxide. These converters are relatively inexpensive and do not compromise fuel economy or vehicle performance.
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Particulate matter
PM can be a primary pollutant or a secondary pollutant formed from other pollutants, such as hydrocarbons, nitrogen oxides, and sulfur dioxides. Diesel exhaust is a significant contributor to PM pollution. Nitrogen oxides (NOx), for instance, can also cause lung irritation and weaken the body's defenses against respiratory infections when acting as a primary pollutant. As a secondary pollutant, NOx reacts with hydrocarbons and sulfur dioxides to form particulate matter and ground-level ozone, a key component of smog.
The health risks associated with particulate matter are severe and wide-ranging. Exposure to PM2.5, which includes particles smaller than 2.5 micrometers in diameter, has been linked to increased illness and death, particularly from cardiovascular and lung diseases. It is estimated that approximately 3.3 million premature deaths worldwide are attributable to outdoor air pollution, with PM2.5 being responsible for the majority of these cases. In the United States alone, an estimated 54,730 premature deaths are attributed to PM2.5 pollution.
The impact of PM pollution is inequitably distributed across different racial groups. Asian Americans, for instance, are exposed to 34% higher PM2.5 concentrations than the average person in the US, while Black people experience 24% higher concentrations. In contrast, White people have exposure levels that are 14% lower than the national average. This disparity is even more evident when comparing census tracts with the highest and lowest exposure to PM2.5 pollution.
To mitigate the health risks associated with particulate matter, various strategies have been proposed and implemented. These include air pollution removal methods, such as utilizing natural areas like forestlands and shrublands to absorb and remove pollutants, as well as source control measures like end-of-pipe control policies and energy-climate policies to improve air quality.
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Volatile organic compounds
VOCs are made up of various chemical substances with different boiling points, including alcohols, ketones, benzenes, alkenes, aldehydes, and esters. The concentration of VOCs inside a vehicle cabin can be higher than in buildings and is influenced by factors such as interior temperature, humidity, ventilation, and vehicle age. VOC levels tend to decrease over time as interior materials off-gas.
The emission concentrations of VOCs vary depending on the type of fuel used, with diesel vehicles generally having higher VOC concentrations than gasoline vehicles. The emission standards and driving speeds also impact VOC emission factors. For example, cold starts significantly influence VOC emissions from gasoline vehicles.
VOCs are not just emitted from tailpipes but also evaporate from interior furnishing materials and infiltrate from engine exhausts and exterior environmental pollutants. The traffic emission of VOCs in Wuhan, China, accounted for 28.9% of total VOCs, with combustion and industrial sources also contributing significantly.
Vehicle emissions are a primary source of VOCs in many large cities worldwide, with rates as high as 58% in Seoul and 80% in Guangzhou. The presence of VOCs increases the levels of ambient air pollution and the health risks to humans, including certain polycyclic aromatic hydrocarbons (PAH) that are known to cause cancer.
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Greenhouse gases
Cars are a significant contributor to global warming and climate change. In the United States, cars and trucks account for nearly one-fifth of all emissions, emitting around 24 pounds of carbon dioxide and other global warming gases for every gallon of gas burned. Similarly, in the United Kingdom, domestic transport accounted for 28% of total domestic emissions in 2022, with cars and taxis being the largest proportion, contributing to 53% of domestic transport greenhouse gas emissions.
The type of fuel used in cars plays a crucial role in greenhouse gas emissions. Gasoline, for example, produces about 20 pounds of CO2 for every gallon burned. On the other hand, diesel produces even higher emissions, with approximately 10,180 grams of CO2 per gallon. Cleaner fuels, such as cellulosic biofuels, can significantly reduce emissions compared to gasoline. Electric vehicles (EVs) are another alternative, as they produce zero tailpipe emissions, although emissions are still created during the production and distribution of the electricity used to power them.
To address the issue of greenhouse gas emissions from cars, individuals can make more environmentally conscious choices when purchasing a vehicle. The EPA's Green Vehicle Guide provides information on the pollution levels of different models, allowing consumers to select cleaner and more fuel-efficient options. Additionally, carpooling, reducing automobile use, and transitioning to renewable energy sources for transportation can help mitigate the impact of greenhouse gases on the environment.
While efforts are being made to reduce greenhouse gas emissions from cars, it is important to recognize that transportation, which includes airplanes, trains, and ships, contributes to around 30% of all heat-trapping gas emissions globally. Therefore, addressing climate change requires a comprehensive approach that involves not only personal vehicles but also other modes of transportation.
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Frequently asked questions
Cars create air pollution through the release of carbon dioxide, carbon monoxide, nitrogen oxides, and particulate matter.
CO2 is released when cars burn fossil fuels like gasoline and diesel. While CO2 is vital for life on Earth, burning fossil fuels unleashes far more carbon dioxide than the planet can handle. This extra CO2 forms a heat-trapping layer around the planet, contributing to global warming and climate change.
CO is a colorless, odorless, and poisonous gas formed by the combustion of fossil fuels. When inhaled, it blocks oxygen from reaching vital organs like the brain and heart.
NOx is formed when nitrogen and oxygen react during the combustion of fossil fuels. It can cause environmental issues like acid rain and deteriorated water quality, and it poses health risks, especially to those with respiratory issues.
PM pollutants are a mixture of solid particles and liquid droplets found in vehicle exhaust. These fine particles can be smaller than one-tenth the diameter of a human hair, allowing them to penetrate deep into the lungs and causing serious health issues.
