Meghan Hodges
Pollution is a substance or agent introduced into the environment that causes harm or disrupts natural processes. There are several types of pollution, including air, water, land, and noise pollution. Air pollution, for instance, is caused when the by-products of an activity become airborne. Water pollution, on the other hand, contaminates water bodies, making them harmful or unsuitable for consumption or other purposes. Land pollution includes waste such as plastic, glass, and electronic waste, while noise pollution includes unwanted or excessive sound from industries, airports, and transportation systems. Here are five types of pollutants that contribute to these forms of pollution:
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What You'll Learn
- Particulate matter: Inhalable particles, composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust or water
- Carbon monoxide: A pollutant emitted from vehicles and factories
- Ozone: Created through interactions between nitrogen oxides and volatile organic compounds when exposed to sunlight
- Nitrogen dioxide: A reddish-brown gas that is soluble in water and a strong oxidant
- Sulfur dioxide: Interacts with the water cycle in the atmosphere to produce acid rain
Particulate matter: Inhalable particles, composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust or water
Particulate matter (PM) refers to inhalable particles composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, or water. PM can vary in size, shape, and chemical composition, and is generally defined by its aerodynamic diameter. The two most common types of PM are PM2.5 and PM10, which refer to particles with diameters of 2.5 microns and 10 microns, respectively. These particles are small enough to be inhaled into the lungs and can cause serious health issues.
PM2.5 is considered more harmful than PM10 as it can penetrate deeper into the lungs and enter the bloodstream. Sources of PM2.5 include the combustion of fuels in power generation facilities, industries, vehicles, and residential heating. It can also be formed through chemical reactions between gases. PM2.5 is a significant component of outdoor air pollution, particularly in areas with high traffic, transportation, industrial activities, power plants, and construction sites.
PM10 is often derived from different sources and has different chemical compositions compared to PM2.5. It includes dust from construction sites, agriculture, wildfires, industrial sources, wind-blown dust, pollen, and waste burning. While PM10 may not penetrate as deeply into the lungs as PM2.5, it can still cause tissue damage and lung inflammation, especially in vulnerable individuals such as older adults with chronic heart or lung disease, children, and asthmatics.
Both short-term and long-term exposure to particulate matter have been linked to adverse health effects. Short-term exposure to PM2.5 has been associated with increased hospital admissions for heart or lung-related issues, acute and chronic bronchitis, asthma attacks, and respiratory symptoms. Long-term exposure to PM has been linked to cardiovascular and respiratory diseases, adverse perinatal outcomes, and lung cancer. It is important to note that there is no safe level of particulate matter exposure, and it is a leading risk factor for premature death globally.
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Carbon monoxide: A pollutant emitted from vehicles and factories
Carbon monoxide (CO) is a colourless, odourless gas that is harmful to humans when inhaled in large amounts. It is one of the six common air pollutants in the United States, known as "criteria pollutants", which are regulated by the Environmental Protection Agency (EPA). These pollutants can cause adverse health effects, environmental damage, and property damage.
Carbon monoxide is released when something is burned. The primary sources of outdoor carbon monoxide pollution are vehicles and machinery that burn fossil fuels, such as cars, trucks, and other vehicles. Industrial activities and power plants are also major sources of carbon monoxide emissions. In addition, certain items within the home, such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves, can release carbon monoxide and negatively impact indoor air quality.
People can be exposed to carbon monoxide by breathing in contaminated air, using improperly maintained equipment, living near industrial areas or busy roads, or working in jobs where carbon monoxide is produced. Exposure to high levels of carbon monoxide can lead to serious health issues, including dizziness, confusion, unconsciousness, and even death.
To mitigate the harmful effects of carbon monoxide, organisations like the EPA work to ensure that CO levels are maintained at safe levels. Additionally, individuals can take measures to reduce their exposure to carbon monoxide, such as properly maintaining equipment and being aware of indoor spaces with poor ventilation.
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Ozone: Created through interactions between nitrogen oxides and volatile organic compounds when exposed to sunlight
Ozone is a gas composed of three oxygen atoms. It can be present in the Earth's upper atmosphere (stratosphere) and at ground level (troposphere). While stratospheric ozone is beneficial, protecting living things from ultraviolet (UV) radiation from the sun, ground-level ozone is harmful to human health and the environment.
Ground-level ozone is a secondary pollutant, formed indirectly through chemical reactions between two primary pollutants: oxides of nitrogen (NOx) and volatile organic compounds (VOCs). These primary pollutants are emitted by cars, power plants, industrial boilers, refineries, chemical plants, and other sources. When these pollutants interact in the presence of sunlight, they create ground-level ozone, which is a significant health concern.
The formation of ground-level ozone depends on the presence of sunlight and heat. Traditionally, ozone concentrations were thought to be higher during the summer months. However, recent observations have shown that high ozone levels can also occur during colder months under specific conditions. For instance, in certain high-elevation areas of the Western US with high VOC and NOx emissions, ozone formation has been observed when snow is present and temperatures are near or below freezing.
Ground-level ozone is a health hazard, particularly for vulnerable individuals such as children, the elderly, and people with lung diseases like asthma. It can trigger adverse health effects, especially on hot sunny days when ozone levels can reach unhealthy levels. Inhaling ozone leads to chemical reactions with various biological molecules in the respiratory tract, causing respiratory issues. Additionally, ozone absorbs UV light, reducing human exposure to harmful UV radiation that can cause skin cancer and cataracts.
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Nitrogen dioxide: A reddish-brown gas that is soluble in water and a strong oxidant
Nitrogen dioxide (NO2) is a reddish-brown gas and a member of the nitrogen oxides (NOx) group of highly reactive gases. It is formed by the high-temperature combustion of fuels in processes used for heating, transportation, power generation, and industry. Sources of nitrogen dioxide include cars, trucks, buses, power plants, off-road equipment, and household items such as furnaces, fireplaces, and gas stoves.
Nitrogen dioxide is soluble in water and reacts with it to form nitrous acid (HONO), a common pollutant in ambient and indoor environments. It is also corrosive and a strong oxidant. In ambient conditions, nitrogen dioxide exists as a gas due to its low partial pressure preventing condensation. It has a pungent odour that can be perceived from a concentration of 188 μg/m3 (0.1 ppm).
As a pollutant, nitrogen dioxide irritates the airways and aggravates respiratory diseases, particularly asthma. Short-term exposure to high concentrations of NO2 can lead to coughing, wheezing, and difficulty breathing, while longer exposures to elevated levels may contribute to the development of asthma and potentially increase susceptibility to respiratory infections.
Nitrogen dioxide is one of the pollutants with the strongest evidence for public health concern. It is included in the WHO global air quality guidelines, along with particulate matter (PM), carbon monoxide (CO), ozone (O3), and sulfur dioxide (SO2).
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Sulfur dioxide: Interacts with the water cycle in the atmosphere to produce acid rain
Sulfur dioxide (SO2) is one of the six common air pollutants, also known as "criteria pollutants", in the United States. These pollutants are harmful to human health, the environment, and can cause property damage. SO2 is a major component of acid rain, which is formed when SO2 and nitrogen oxides (NOx) are released into the atmosphere and transported by wind and air currents.
SO2 and NOx react with water, oxygen, and other chemicals to form sulfuric and nitric acids. These acids then mix with water vapour and other materials in the atmosphere before falling back to the ground as acid rain. Acid rain typically has a pH between 4.2 and 4.4, compared to the pH of 5.6 for normal rain, which is slightly acidic due to dissolved carbon dioxide.
The major sources of SO2 and NOx in the atmosphere are the burning of fossil fuels for electricity generation, vehicles and heavy equipment, manufacturing, oil refineries, and other industries. While a small portion of these emissions is from natural sources such as volcanoes, most of it is anthropogenic, and emissions have increased significantly since the Industrial Revolution.
Acid rain can have detrimental effects on the environment, including water bodies, vegetation, and buildings. It can cause lakes and streams to turn acidic, harming aquatic life such as fish and insects. Acid rain can also damage buildings, historical monuments, and statues, especially those made of rocks containing large amounts of calcium carbonate, such as limestone and marble. The corrosive effects of acid rain on limestone and marble were first noted in the 17th century by John Evelyn.
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