Kiera Jefferson
The Earth's atmosphere is made up of various gases, some of which are natural and some of which are human-made pollutants. The primary pollutants include carbon monoxide, nitrous oxides, volatile organic compounds, sulfur dioxide, and particulate matter. These pollutants can cause harm directly or react with other chemicals to form harmful secondary pollutants, such as acid rain. Ozone, a gas composed of three oxygen atoms, can be a pollutant or a protective layer, depending on its location in the atmosphere. While ground-level ozone is a harmful pollutant, stratospheric ozone shields us from ultraviolet rays. The presence of pollutants in the atmosphere has led to global efforts to reduce emissions and improve air quality.
| Characteristics | Values |
|---|---|
| Composition | Nitrogen, Oxygen, Argon, Carbon Dioxide, Neon, Helium, Methane, Krypton, Hydrogen |
| Most Abundant Gas | Nitrogen (N2) at 78% |
| Second Most Abundant Gas | Oxygen (O2) at 21% |
| Third Most Abundant Gas | Argon (Ar) at 0.93% |
| Contains | Water in all three phases (liquid, solid, and gas), solid particles called aerosols (e.g. dust, sea salt, ash) |
| Function | Ozone in the upper atmosphere forms a protective layer that shields from UV rays |
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What You'll Learn
- Nitrogen gas is inert in the atmosphere but essential for life elsewhere on Earth
- Oxygen from the atmosphere helps break down matter and release nutrients into the soil
- Natural and human-made chemicals in the troposphere can negatively impact human health and the environment
- Particulate matter like dust, soot, and sulfates can damage the respiratory system
- Heavy metals, including lead and mercury, are toxic to humans and animals
Nitrogen gas is inert in the atmosphere but essential for life elsewhere on Earth
Nitrogen is the most abundant element in Earth's atmosphere, making up approximately 78% of it. While nitrogen gas (N2) is relatively inert in the atmosphere, it is essential for life on Earth. Nitrogen is a key component of DNA, which carries our genetic information, and is also a crucial component of many other cellular processes, including the synthesis of amino acids and proteins.
Nitrogen is also essential for plant growth and, therefore, the production of food. Plants cannot utilise nitrogen directly from the atmosphere due to its gaseous form. Instead, they depend on nitrogen-fixing bacteria that convert nitrogen gas (N2) into ammonium ions (NH4+), which plants can then absorb through their roots. Legumes, such as clover and lupins, are often cultivated by farmers because their root nodules contain these nitrogen-fixing bacteria.
Additionally, lightning plays a role in converting atmospheric nitrogen into ammonia and nitrate (NO3), which enter the soil through rainfall. Nitrogen compounds in the soil can also be derived from the decomposition of organic matter, including dead plants, animals, and animal waste. These nitrogen compounds are broken down by microorganisms, known as decomposers, and returned to the soil.
Through agricultural practices, humans have significantly influenced the nitrogen cycle. Farmers use nitrogen-rich fertilisers to enhance crop yields. However, excess nitrogen can have detrimental effects. When nitrogen exceeds plant demand, it can leach from soils into waterways, contributing to eutrophication and polluting aquatic ecosystems.
Furthermore, during the chemical processes of nitrification and denitrification, incomplete reactions can lead to the formation of nitrous oxide (N2O). This compound is a potent greenhouse gas that contributes to global warming. Therefore, while nitrogen gas (N2) in the atmosphere may be relatively inert, the dynamic nature of the nitrogen cycle and human activities have introduced complexities that impact life on Earth.
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Oxygen from the atmosphere helps break down matter and release nutrients into the soil
Oxygen is a vital component of the Earth's atmosphere, and it plays a crucial role in the breakdown of matter and the release of nutrients into the soil. This process is facilitated by various organisms and microorganisms present in the soil, which contribute to the decomposition of organic matter and the cycling of nutrients.
Plants play a key role in this process. Through photosynthesis, plants absorb carbon dioxide from the atmosphere and, using energy from sunlight, convert it into glucose and oxygen. This oxygen is released into the atmosphere, contributing to the Earth's oxygen supply. Additionally, plants require various nutrients from the soil, such as nitrogen and mineral nutrients, to carry out their life processes.
When plants and animals die, their organic matter begins to decompose. This decomposition process is facilitated by microorganisms in the soil, which break down the complex organic molecules into simpler forms. During this breakdown, nutrients such as nitrogen are released into the soil. Nitrogen, in particular, undergoes a process called mineralization, where it is converted into inorganic forms like ammonium salts. These salts are then absorbed by clay particles in the soil and further transformed by bacteria into nitrite and nitrate, which are more readily available for plants to absorb.
The cycling of nutrients in the soil is essential for maintaining soil fertility and supporting plant growth. The decomposition of organic matter not only releases nutrients but also helps create a favourable environment for plants to thrive. Additionally, certain human activities, such as composting, can introduce beneficial organisms into the soil, aiding in the breakdown of matter and enhancing soil quality.
While oxygen from the atmosphere is crucial for breaking down matter and releasing nutrients, it is important to note that human activities can disrupt this process. For example, the burning of fossil fuels and forests releases nitrogen oxides, contributing to air pollution and affecting the nitrogen cycle. Similarly, the use of nitrogen-rich fertilizers can lead to nutrient loading in nearby water bodies. Therefore, it is essential to strike a balance and adopt sustainable practices to maintain the natural balance of the ecosystem.
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Natural and human-made chemicals in the troposphere can negatively impact human health and the environment
The troposphere is the lowest layer of the Earth's atmosphere. Natural and human-made chemicals in this layer can negatively impact human health and the environment.
Human-made chemicals in the troposphere are primarily released through vehicle emissions, fuel oils, natural gas, manufacturing by-products, power generation, and chemical production. These chemicals include nitrogen oxides, volatile organic compounds (VOCs), carbon monoxide, and fine particulate matter (PM 2.5). PM 2.5, which is 30 times thinner than a human hair, can be inhaled deeply into the lungs and contribute to serious health issues, including cardiovascular disease and cancer. VOCs, which contain carbon, are released by paints, cleaning supplies, pesticides, and during combustion.
Tropospheric ozone, also known as ground-level ozone, is a harmful secondary air pollutant created when primary pollutants, such as nitrogen oxides and VOCs, react with sunlight. It is most common in urban areas and is a major component of smog, a toxic haze that negatively affects human health and the environment.
Natural sources of air pollution include smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane. While some of these natural processes are caused or influenced by human activity, such as wildfires, they still release hazardous substances into the atmosphere.
The presence of these natural and human-made chemicals in the troposphere contributes to air pollution, which is a significant threat to global health and prosperity. It is associated with respiratory issues, oxidative stress, inflammation, and an increased risk of chronic diseases and cancer. Understanding and mitigating the impact of these chemicals on human health and the environment is crucial for improving air quality and protecting global health.
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Particulate matter like dust, soot, and sulfates can damage the respiratory system
Particulate matter, or particle pollution, refers to a mix of tiny solid and liquid particles in the air we breathe. These particles are so small that they can bypass our body's natural defences, making their way deep into the lungs. This is particularly true of fine and ultrafine particles, which are smaller than 2.5 microns in diameter. These particles can get trapped in the lungs, and the smallest can even pass through the lungs into the bloodstream, causing harm to the lungs, heart, brain, and other organs.
The pathogenicity of particulate matter depends on several factors, including size, composition, origin, solubility, and the ability to produce reactive oxygen. Smaller particles, such as PM2.5, have large surface areas that can carry various toxic substances. These particles can pass through the filtration of nose hair, reaching the end of the respiratory tract and accumulating there. This can damage other parts of the body through air exchange in the lungs.
Studies have shown that exposure to particulate matter air pollution is associated with a high number of premature deaths per year, as well as an increased risk of respiratory diseases. For example, the "Harvard Six Cities Study" published in 1996 revealed that PM2.5 was one of the causative factors of non-accidental human deaths, particularly in the elderly. Additionally, a 2022 public health study in seven Western European countries found a strong association between long-term exposure to very low levels of PM2.5 and mortality from respiratory and lung cancer.
Particulate matter is one of the primary pollutants in Earth's atmosphere, along with gaseous pollutants such as sulfur dioxide (SO2), nitrogen dioxide (NO2), nitric oxide (NO), ozone (O3), and carbon monoxide (CO). These pollutants are primarily produced by transportation, the combustion of petroleum products, and the emission of chlorofluorocarbons (CFCs). While there has been a global push to reduce the presence of these pollutants, particularly since the 1970s and 1980s, they continue to pose significant risks to human health.
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Heavy metals, including lead and mercury, are toxic to humans and animals
Heavy metal toxicity is a major threat to humans and animals. Heavy metals, including lead and mercury, are all around us—in the ground, water, and products we use daily. However, high levels of these metals can cause health problems and even heavy metal poisoning. Lead, for example, can cause cognitive problems and slower development in children, especially infants who drink formula mixed with tap water if it is contaminated. Mercury is also a hazardous metal, with cases of acute heavy metal poisoning caused by exposure to it.
Heavy metals can enter our bodies through ingestion or inhalation of contaminated substances. They can then accumulate in our bodies, exhibiting a chronic nature. Some metals, such as aluminium, can be eliminated, but others build up in our organs, causing serious diseases like cancer. Heavy metal poisoning can cause various symptoms, including acute effects such as sickness and interference with metabolic processes. Chronic poisoning, on the other hand, occurs after contact with low doses over a long period, with symptoms appearing slowly.
Certain metals, such as cadmium, can be absorbed by the body and accumulate throughout life. Cadmium can cause nephrotoxicity and interfere with essential elements like zinc. Chromium is another toxic metal that occurs in several oxidation states, with the trivalent and hexavalent forms being particularly harmful to humans, animals, and plants.
The environmental presence of heavy metals is a growing concern. These inorganic pollutants are being released into our waters, soils, and atmosphere due to agriculture, metal industries, improper waste disposal, fertilizers, and pesticides. Various public health measures have been implemented to control, prevent, and treat metal toxicity, including occupational exposure prevention and waste management.
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Frequently asked questions
A primary pollutant is a pollutant that can directly cause harm or react with other chemicals to form harmful substances.
Nitrogen is not a primary pollutant. It makes up about 78% of the Earth's atmosphere and does almost nothing in the atmosphere, but it is essential for life elsewhere on Earth.
Carbon monoxide, nitrous oxides, volatile organic compounds, sulfur dioxide, and particulate matter such as dust and soot.
Primary pollutants can have various detrimental effects on human health and the environment. For example, carbon monoxide blocks oxygen delivery to cells, particulate matter can damage the respiratory system, and sulfur dioxide contributes to acid rain.
Secondary pollutants are formed when primary pollutants undergo further reactions in the atmosphere. An example of a secondary pollutant is acid rain, which is formed when sulfur dioxide reacts with oxygen and water to produce sulfuric acid.
