Helena Joyce
Air is composed of various gases, with nitrogen (78%) and oxygen (21%) being the most abundant, followed by trace amounts of argon, carbon dioxide, neon, helium, methane, krypton, and hydrogen. The amount of water vapour in the air varies, but it can constitute up to 5% of the atmosphere. In addition to these naturally occurring gases, human activities have introduced numerous pollutants into the air, including particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide. These pollutants have detrimental effects on human health and the planet, contributing to respiratory issues, cardiovascular diseases, lung cancer, and climate change. According to the World Health Organization (WHO), air pollution is responsible for approximately seven million deaths annually worldwide.
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What You'll Learn
- Nitrogen makes up 78% of air, and is essential for life
- Oxygen, at 21%, is used by humans and animals in cellular respiration
- Water vapour in the air varies from 1-5%, with the poles containing only trace amounts
- Air pollution is caused by human-made chemicals, with 99% of people breathing poor air
- Pollutants include particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide
Nitrogen makes up 78% of air, and is essential for life
Nitrogen makes up 78% of air and is the most abundant naturally occurring gas in the Earth's atmosphere. The other main components of air are oxygen (21%) and argon (0.93%), with trace amounts of carbon dioxide, methane, helium, neon, krypton, and hydrogen. While nitrogen in the atmosphere does almost nothing, it is essential for life on Earth.
Nitrogen enters the soil and water through the nitrogen cycle and binds with other elements, making it usable for living things. This process is vital for the survival of plants and animals. Nitrogen is also a key component of the proteins that make up our bodies and is essential for DNA and RNA synthesis.
However, human activities have led to an increase in nitrogen oxides in the atmosphere, which can have negative consequences. Nitrogen dioxide (NO2), for example, is a significant air pollutant. It is produced by high-temperature combustion in vehicles, industries, and power generation. Breathing in nitrogen dioxide can irritate the eyes, nose, and throat and cause respiratory issues, especially for those with asthma or allergies.
Vehicle exhaust contains nitrogen dioxide and other polluting chemicals, such as carbon monoxide and sulfur dioxide. These emissions contribute to smog, which can damage the lungs and worsen respiratory conditions. Additionally, the combustion of fossil fuels releases nitrogen oxides, which are significant greenhouse gases contributing to climate change.
Therefore, while nitrogen is essential for life and makes up a significant portion of the air we breathe, human activities that alter the natural nitrogen cycle can have detrimental effects on human health and the environment. Addressing these issues through sustainable practices and policies can help mitigate the negative impacts of nitrogen-based pollutants while recognizing the importance of nitrogen for supporting life on Earth.
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Oxygen, at 21%, is used by humans and animals in cellular respiration
Air is composed of various gases, with nitrogen (N2) being the most abundant, making up about 78% of the air. The second most abundant gas is oxygen (O2), which constitutes approximately 21% of the air. Other gases are present in trace amounts, including argon (Ar) at 0.93%, carbon dioxide (CO2), neon (Ne), helium (He), methane (CH4), and krypton (Kr). The troposphere, the lowest layer of the Earth's atmosphere, contains about three-fourths of all air. It holds water in all three phases (solid, liquid, and gas) and solid particles called aerosols, which include dust, sea salt, and volcanic ash. The concentration of water vapour in the troposphere varies, with higher amounts near the tropics and lower amounts near the poles.
Oxygen, accounting for 21% of the air we breathe, is of utmost importance for life on Earth. Humans and animals rely on this oxygen for cellular respiration, a fundamental process that generates energy by breaking down glucose in the presence of oxygen. This process occurs in the mitochondria of cells and produces carbon dioxide as a waste product. The energy produced through cellular respiration is essential for sustaining various life activities, such as muscle movement, maintaining body temperature, and supporting growth and development.
While oxygen is essential for life, it's important to recognise the presence of air pollutants that can negatively impact human health and the environment. These pollutants are detrimental substances released into the air, and they contribute to the seven million premature deaths globally each year, according to the World Health Organization (WHO). Air pollution sources include the combustion of fossil fuels, household activities, industrial processes, and natural occurrences like forest fires.
Particulate matter, or tiny pieces of solids or liquids suspended in the air, is a significant pollutant. These particles can be microscopic or large enough to be visible. Smaller particles, known as PM2.5, can penetrate deep into the lungs and even enter the bloodstream, exacerbating respiratory issues and leading to serious health conditions.
Other common air pollutants include carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide (SO2), and ozone (O3). These pollutants are released from vehicle exhausts, industrial processes, and household activities. Their presence in the air can irritate the eyes, nose, and throat, and they have been linked to respiratory and cardiovascular diseases, as well as adverse perinatal outcomes and lung cancer.
Addressing air pollution is crucial for both human health and the environment. Implementing policies that promote sustainable practices, cleaner energy sources, and improved waste management can help mitigate the negative impacts of air pollution and improve the quality of the air we breathe, ensuring that the essential 21% oxygen in the air remains beneficial rather than detrimental to life.
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Water vapour in the air varies from 1-5%, with the poles containing only trace amounts
Air is a mixture of gases, most of which are naturally occurring. The dry composition of the atmosphere is primarily nitrogen (about 78%) and oxygen (about 21%). The third most common gas is the inert gas argon (0.93%), followed by water vapour, which varies from 1-5% and is more commonly within the 1-3% range. The concentration of water vapour in the air is constantly changing due to the water cycle. The lower troposphere can contain up to 4% water vapour in areas near the tropics, while the poles contain only trace amounts. The concentration of water vapour decreases drastically with altitude, with the stratosphere and mesosphere having almost no water vapour, and the thermosphere containing none.
Water vapour in the air, although small in proportion to nitrogen and oxygen, is still significant. It is the third most common gas in the atmosphere, and it exists in all three phases (liquid, solid, and gas) in the troposphere. Water vapour is a key component of the water cycle, which is essential for life on Earth. It also affects climate by helping clouds form and shading the planet by scattering or absorbing sunlight.
Air also contains solid particles called aerosols, such as dust, sea salt, and ash from erupting volcanoes or forest fires. Aerosols are another factor that influences climate change, and their presence in the atmosphere has increased in the last century due to the manufacturing and widespread use of combustion engines.
Human activities have significantly impacted the composition of the atmosphere, introducing various pollutants that are detrimental to human health and the planet. These include nitrogen dioxide, carbon monoxide, sulphur dioxide, ozone, particulate matter, and other industrial pollutants such as chlorine compounds, fluorine compounds, and elemental mercury vapour. According to the World Health Organization (WHO), air pollution is responsible for nearly seven million deaths globally each year.
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Air pollution is caused by human-made chemicals, with 99% of people breathing poor air
Air is composed mostly of nitrogen (78%) and oxygen (21%), with trace amounts of other gases, including argon (0.93%), carbon dioxide, neon, helium, methane, krypton, and hydrogen. However, human activities have significantly altered the composition of the air by introducing various pollutants. According to the World Health Organization (WHO), 99% of people worldwide breathe poor-quality air that exceeds the organization's air quality guidelines. This means that almost everyone is exposed to harmful levels of pollutants that can have detrimental effects on their health.
The primary sources of air pollution are energy use and production, with fossil fuels being the most significant contributor. The burning of fossil fuels, such as gasoline, oil, and fracked gas, releases a multitude of harmful chemicals and gases into the air. Vehicle exhaust, for example, emits nitrogen dioxide, carbon monoxide, and sulfur dioxide. Other human activities, such as industrial processes, power generation, and agricultural practices, also contribute to air pollution. Particulate matter, a mixture of solid and liquid droplets in the air, is of particular concern. These particles, especially those smaller than 2.5 micrometres (PM2.5), can penetrate deep into the lungs and enter the bloodstream, causing cardiovascular, cerebrovascular, and respiratory issues.
The impact of air pollution on human health is significant. Exposure to poor air quality can lead to respiratory diseases like asthma and symptoms such as coughing, wheezing, and difficulty breathing. Long-term exposure to air pollution has also been linked to adverse perinatal outcomes and lung cancer. The COVID-19 pandemic further highlighted the correlation between air pollution and mortality rates, with higher death rates observed in areas with more particulate matter pollution. Additionally, low- and middle-income countries bear the brunt of the health impacts of air pollution, experiencing the highest exposures to harmful pollutants.
To address this global health crisis, urgent action is needed to reduce air pollution levels. The WHO and other organizations emphasize the importance of curbing fossil fuel use and transitioning to cleaner energy systems. This includes adopting electric vehicles, moving away from oil and gas heating, and scaling up green energy solutions. Additionally, reducing emissions from industries, improving waste management practices, and prioritizing clean energy access for households can help improve air quality.
While natural sources of air pollution, such as desert dust and volcanic eruptions, contribute to the problem, human-made chemicals are primarily responsible for the current state of air quality. The widespread use of combustion engines, industrial activities, and the burning of fossil fuels have led to an unprecedented increase in air pollutants, endangering the health and well-being of people worldwide.
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Pollutants include particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide
Air is composed mostly of nitrogen (78%) and oxygen (21%), with trace amounts of argon, carbon dioxide, and other gases. However, human activities have introduced various pollutants into the air, including particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide. These pollutants can have detrimental effects on both human health and the environment.
Particulate matter, or particle pollution, refers to a mixture of solid particles and liquid droplets found in the air. These particles can be large, such as dust, dirt, soot, or smoke, or so small that they can only be detected using an electron microscope. The smaller particles, known as PM2.5, with diameters of 2.5 micrometers or less, pose the greatest risk to health as they can penetrate deep into the lungs and even enter the bloodstream. They are also the main cause of reduced visibility (haze) in certain regions. PM2.5 is commonly emitted from construction sites, unpaved roads, fields, smokestacks, and fires.
Carbon monoxide (CO) is a colorless and odorless gas formed by the incomplete combustion of air and fuel. The primary sources of CO pollution are emissions from fossil fuel-powered engines, including motor vehicles, construction equipment, and boats. Other sources include industrial processes, residential wood burning, and natural sources such as forest fires. CO can have harmful health effects by reducing oxygen delivery to the body's organs and tissues, particularly for individuals with heart disease.
Nitrogen dioxide (NO2) is one of the principal nitrogen oxides associated with combustion sources. Road traffic is the main outdoor source of nitrogen dioxide, while indoor sources include tobacco smoke and the burning of gas, wood, oil, kerosene, and coal for heating or cooking. Nitrogen dioxide can cause cell injury and inflammation, and exposure to high concentrations of this pollutant can lead to respiratory issues and other health problems.
Sulfur dioxide (SO2) is a highly reactive gas emitted into the air as a result of fossil fuel combustion and industrial processes. The largest sources of SO2 emissions are power plants and other industrial facilities that burn fossil fuels. SO2 and other sulfur oxides (SOx) contribute to the formation of particulate matter and can have detrimental effects on human health, ecosystems, and the environment. They can react with other compounds in the atmosphere to form fine particles that reduce visibility and contribute to acid rain, which can harm sensitive ecosystems.
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Frequently asked questions
Air is composed of about 78% nitrogen, 21% oxygen, 0.93% argon, and trace amounts of carbon dioxide, neon, helium, methane, krypton, hydrogen, and water vapour. The amount of water vapour in the air varies, but it averages around 0.25% of the atmosphere by mass, though it can be as high as 5%. Air also contains human-made pollutants, including nitrogen dioxide, carbon monoxide, sulfur dioxide, and particulate matter.
Major outdoor pollution sources include residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry. Household activities such as cooking and heating with dirty technologies, and lighting with kerosene, emit indoor air pollutants.
Air pollution is responsible for about 7 million premature deaths annually. Particulate matter, or particle pollution, can irritate the eyes, nose, and throat, and smaller particles can get into the deep parts of the lungs and even the bloodstream, worsening bronchitis and leading to heart attacks. Long-term exposure to particle pollution has been linked to lung cancer, strokes, heart disease, and acute and chronic respiratory diseases.
