Helena Joyce
Oxygen is a fundamental element that supports life on Earth. However, it is also a key component in the formation of air pollutants, which have detrimental effects on human health and the environment. Air pollution is primarily caused by the combustion of hydrocarbon fuels, which releases by-products such as carbon dioxide, carbon monoxide, water vapour, smoke, and particulate matter. These pollutants contribute to respiratory issues, increased incidence of stroke, heart disease, lung cancer, and asthma. While oxygen itself is not considered a pollutant, its reaction with other substances can lead to the formation of harmful compounds, such as ground-level ozone and nitrogen oxides, which are regulated by organizations like the EPA and WHO to safeguard human health and the environment.
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What You'll Learn
Oxygen's role in combustion
Oxygen is not a pollutant. In fact, it is a critical component for combustion, acting as an oxidizing agent. In the Earth's atmosphere, oxygen concentration is about 21%, which is sufficient for most combustion processes.
Oxygen reacts with carbon, hydrogen, and other elements present in the fuel, breaking chemical bonds and forming new compounds like carbon dioxide and water. This process can be represented as:
${\text{CH}_{4}}{\text{ + }}{{\text{O}}_{2}} \to {\text{CO}}_{2}{\text{ + 2}}{{\text{H}}_{2}}{\text{O + Heat}}*$
The combustion of fossil fuels, such as coal, can lead to the generation of renewable fuels used for various purposes, including powering rockets, cooking, and industrial uses. However, the incomplete combustion of fuels can contribute to air pollution.
Air pollution is responsible for approximately 6.7 million premature deaths annually. Incomplete combustion of fuels and chemical reactions between gases can result in the release of harmful pollutants. For example, carbon monoxide (CO), a toxic gas, is produced by incomplete combustion in motor vehicles. It can cause serious health issues, including difficulties in breathing, exhaustion, dizziness, and even death in high concentrations.
Particulate matter (PM), composed of inhalable particles such as sulphate, nitrates, and black carbon, is another concern. The largest particles, known as coarse particles, come from sources like wind-blown dust, while the finer particles (PM2.5) can be derived from the combustion of fuels in power generation facilities, industries, or vehicles. These fine particles can penetrate deep into the lungs and enter the bloodstream, leading to cardiovascular and respiratory issues.
In summary, while oxygen itself is not a pollutant, it plays a vital role in the combustion process, which can inadvertently contribute to air pollution when incomplete or inefficient combustion occurs.
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Oxygen's role in creating smog
Oxygen is not a pollutant. However, it plays a role in the formation of smog, which is a type of intense air pollution. Smog is formed when a large number of gas-phase molecules and particulate matter are emitted into the atmosphere, creating a visible haze. This haze is a mixture of smoke and fog, hence the term "smog," which was coined in the early 20th century.
Photochemical smog, a type of smog, is initiated by nitrogen oxides emitted into the air as pollutants from internal combustion engines. These nitrogen oxides absorb visible or ultraviolet energy from sunlight and form nitric oxide (NO), which then frees atoms of oxygen (O). The free oxygen atoms then combine with molecular oxygen (O2) in the air to form ozone (O3). This process results in the formation of smog, particularly in large cities with significant traffic emissions.
Volcanic eruptions also contribute to the creation of smog, often referred to as "vog." An erupting volcano emits high levels of sulfur dioxide and particulate matter, which are key components in the formation of smog. Weather conditions, such as humidity and poor air circulation, also play a crucial role in the formation of smog.
Additionally, industrial activities, power generation, and the combustion of fossil fuels release pollutants that contribute to smog formation. The installation of filters and pollutant capture technologies in industrial chimneys can help reduce these emissions. Trees also act as natural filters, absorbing pollutants and releasing oxygen, thereby improving air quality.
The presence of smog has significant health impacts. Air pollution, including smog, is responsible for millions of premature deaths annually. Exposure to pollutants in smog can trigger asthma attacks, especially in children, and is associated with various health issues, including respiratory and cardiovascular problems.
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Oxygen's role in cellular metabolism
Oxygen is essential for cellular metabolism, specifically in the process of cellular respiration. This is a set of metabolic reactions and processes that occur in cells to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, biological fuels are oxidised using an inorganic electron acceptor, such as oxygen, to drive ATP production. This process is known as aerobic cellular respiration.
The first step in cellular respiration is glycolysis, which occurs in the cytosol of cells in all living organisms. It involves the conversion of glucose 6-phosphate into fructose 6-phosphate, which then splits into two phosphorylated molecules. These molecules degrade into pyruvate, which is oxidised to acetyl-CoA and carbon dioxide (CO2) by the pyruvate dehydrogenase complex (PDC). This complex is located in the mitochondria of eukaryotic cells and the cytosol of prokaryotes.
The next step is the Krebs cycle, also known as the citric acid cycle or tricarboxylic acid cycle. In this step, when oxygen is present, acetyl-CoA is produced from the pyruvate molecules formed during glycolysis. The potential of NADH and FADH2 is then converted into more ATP through an electron transport chain, with oxygen and protons (hydrogen ions) acting as the "terminal electron acceptors". Most of the ATP produced by aerobic cellular respiration is synthesised through oxidative phosphorylation.
Aerobic metabolism is significantly more efficient than anaerobic metabolism, which occurs in the absence of oxygen. In anaerobic conditions, some organisms can continue with anaerobic respiration, using inorganic molecules other than oxygen as final electron acceptors. However, this process yields less ATP compared to aerobic respiration.
Oxygen metabolism also involves the production of reactive oxygen species (ROS), which are free radicals originating from oxygen metabolism. These free radicals have been linked to oxidative stress in animal studies, particularly due to radiation from mobile phones. Additionally, under conditions of hypoxia, mitochondria participate in an ROS burst, which can impact cellular metabolism and energy production.
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Oxygen's reaction with Volatile Organic Compounds
Oxygen is not a pollutant. However, oxygen does play a role in the formation of some pollutants and in the chemical reactions that remove pollutants from the atmosphere. Volatile organic compounds (VOCs) are a class of organic compounds that have a high vapour pressure and low boiling points at room temperature. VOCs are common and exist in a variety of settings and products, including house mould, upholstered furniture, art and craft supplies, dry-cleaned clothing, and cleaning supplies.
The high vapour pressure of VOCs is correlated with a low boiling point, which relates to the number of the sample's molecules in the surrounding air, a trait known as volatility. VOCs are defined by their chemical composition and ability to evaporate under normal indoor atmospheric conditions of temperature and pressure. The volatility of a VOC is generally higher the lower its boiling point temperature. The boiling point is used to define a VOC, with the European Union defining it as any organic compound with an initial boiling point of less than or equal to 250°C.
Oxygenated VOCs (OVOCs) are a type of VOC that contains oxygen. OVOCs are formed through the oxidation of volatile organic compounds (VOCs) and contribute to the production of ozone in the atmosphere. They are also associated with adverse health effects in some sensitive populations. OVOCs are formed through both natural and anthropogenic processes. Natural sources of OVOCs include emissions from vegetation, while anthropogenic sources include the combustion of fossil fuels and industrial activities.
The chemical reactions that form OVOCs can produce harmful by-products and sub-micron-sized particles that can be inhaled and cause health issues. These reactions also produce ozone, which is a secondary pollutant that contributes to smog formation and has adverse health effects. OVOCs can also react with other pollutants in the atmosphere to form new compounds, such as the secondary formation of formaldehyde in the urban atmosphere.
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Oxygen's displacement by pollutants
Oxygen is essential for human survival, but it can also be displaced by pollutants, leading to harmful consequences for both human health and the environment.
One of the primary ways pollutants displace oxygen is through the combustion of polluting fuels. This occurs in various contexts, including motor vehicles, domestic heating, industrial processes, power generation, and cooking and space heating in households. The incomplete combustion of fuels releases pollutants such as carbon monoxide (CO) and particulate matter (PM). Carbon monoxide, specifically, can displace oxygen in the body by binding to red blood cells, reducing the amount of oxygen that can be carried throughout the body. This can lead to serious health issues, including difficulties in breathing, exhaustion, dizziness, and even death in extreme cases.
Particulate matter, on the other hand, refers to inhalable particles composed of various substances, including sulphate, nitrates, ammonia, and black carbon. These particles can be released directly from sources like vehicle emissions or indirectly through chemical reactions between gases. When inhaled, particulate matter can penetrate deep into the lungs and even enter the bloodstream, causing cardiovascular and respiratory issues.
Additionally, air pollution can also impact water bodies, leading to oxygen displacement and depletion. Agricultural and urban runoff can increase the amount of algae and macrophytes in water bodies. While this leads to higher oxygen levels during the day due to photosynthesis, it also results in increased oxygen consumption at night during respiration. When these plants die, their decomposition by bacteria and fungi further consumes oxygen, leading to a net loss of oxygen in the water. This process contributes to the phenomenon of ocean deoxygenation, where oceans have been experiencing a decline in oxygen content, threatening marine biodiversity and ecosystem services.
Climate change and increased nutrient discharges are significant contributors to ocean deoxygenation. Warming-driven deoxygenation occurs when warmer water temperatures reduce the solubility of oxygen, making it more difficult for oxygen to dissolve in the water. This, in combination with increased nutrient pollution, can lead to eutrophication, where excessive nutrients stimulate algae growth, resulting in oxygen depletion as the algae decomposes.
To address oxygen displacement by pollutants, urgent action is required. This includes mitigating climate change, reducing carbon dioxide emissions, and minimizing nutrient pollution in both aquatic and atmospheric environments. By taking these steps, we can help restore oxygen levels and protect the health and biodiversity that depend on it.
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Frequently asked questions
No, oxygen is not a pollutant. In fact, the lack of oxygen is what damages tissues and cells in the human body.
A pollutant is any substance that causes harm to the environment or living things. Air pollution, for example, is primarily caused by the burning of hydrocarbon fuels and the release of by-products into the atmosphere. These by-products include carbon dioxide (CO2), carbon monoxide (CO), water vapour, smoke, and ash.
Some common air pollutants include particulate matter (PM), nitrogen dioxide (NO2), carbon monoxide (CO), sulphur dioxide (SO2), and ozone (O3). These pollutants can be released into the air through various human activities, such as road traffic, energy production, and industrial processes.
Air pollution has serious effects on human health, including an increased incidence of stroke, heart disease, lung cancer, and asthma. Pollutants like carbon monoxide can cause difficulties in breathing, exhaustion, dizziness, and even death in high concentrations. Therefore, monitoring and regulating air quality are crucial for safeguarding public health.
