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This is the complete lecture note for EVM 204 Environmental Problems. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Series 1 Course code: EVM 204 Course title: Environmental Problems Course credit load: 2 Units List of Series: • Series 1: Air Pollution and Climate Impacts • Series 2: Water Contamination and Soil Degradation • Series 3: Deforestation, Biodiversity Loss, and Habitat Destruction • Series 4: Waste Generation, Disposal, and Urban Environmental Challenges • Series 5: Socioeconomic Drivers and Mitigation Strategies for Sustainability Series Outline Series 1: Air Pollution and Climate Impacts • Part 1 (1.1): Sources and Types of Air Pollution ◦ Sub-Part 1.1.1: Definition and classification of air pollutants ◦ Sub-Part 1.1.2: Natural and anthropogenic sources of air pollution • Part 2 (1.2): Health and Environmental Effects of Air Pollution ◦ Sub-Part 1.2.1: Effects of air pollution on human health ◦ Sub-Part 1.2.2: Environmental and ecological consequences of air pollution ◦ Sub-Part 1.2.3: Air pollution and indoor environments • Part 3 (1.3): Climate Change and Global Warming ◦ Sub-Part 1.3.1: The greenhouse effect and greenhouse gases
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS ◦ Sub-Part 1.3.2: Causes and consequences of global warming ◦ Sub-Part 1.3.3: Air quality monitoring and pollution control methods Introduction The air we breathe is fundamental to life, yet it is one of the most threatened environmental resources in the modern world. Air pollution, arising from both natural and human activities, poses serious risks to human health, ecosystems, and the global climate. Understanding the sources, types, and effects of air pollution is therefore essential for anyone concerned with environmental problems and their solutions. The aim of this Series is to equip you with a clear understanding of air pollution and its climate impacts, enabling you to identify the major sources and types of air pollutants, assess their consequences on health and the environment, and appreciate the relationship between air pollution and global climate change. We shall commence this Series by exploring the sources and types of air pollution, including the definition and classification of air pollutants and an examination of both natural and anthropogenic sources. Next, we will examine the health and environmental effects of air pollution, considering how pollutants affect the human body, ecosystems, and indoor environments. Finally, we will conclude with an exploration of climate change and global warming, where we will discuss the greenhouse effect, the causes and consequences of rising global temperatures, and the methods used to monitor and control air pollution. Series Learning Outcomes Upon completing this Series, you should be able to: SLO 1.1 define air pollution and classify the major types and sources of air pollutants, SLO 1.2 analyse the effects of air pollution on human health, ecosystems, and indoor environments, SLO 1.3 describe the greenhouse effect and explain the role of greenhouse gases in climate change, SLO 1.4 evaluate the causes and consequences of global warming on natural and human systems, and SLO 1.5 examine the methods used for air quality monitoring and pollution control.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1 Sources and Types of Air Pollution 1.1.1 Definition and classification of air pollutants Air pollution refers to the presence of harmful substances in the atmosphere at concentrations that are sufficient to cause harm to humans, animals, plants, and the environment. These substances, known as air pollutants, may be in the form of gases, liquids, or solid particles. Understanding air pollution begins with knowing what pollutants are and how they are classified. Air pollutants are broadly classified into two categories: • Primary pollutants are those emitted directly into the atmosphere from identifiable sources. Examples include carbon monoxide (CO) from vehicle exhaust, sulphur dioxide (SO₂) from industrial processes, and particulate matter (PM) from construction sites and factories. • Secondary pollutants are not emitted directly but are formed in the atmosphere through chemical reactions between primary pollutants and other atmospheric components. Ground-level ozone (O₃) is a well-known secondary pollutant formed when nitrogen oxides and volatile organic compounds react in the presence of sunlight. Another common classification is based on the physical state of the pollutant: gaseous pollutants (such as CO, SO₂, and nitrogen dioxide) and particulate pollutants (such as dust, soot, and pollen). Fill in the blank: Air pollutants can be classified as __________ pollutants, which are emitted directly, or __________ pollutants, which form through atmospheric chemical reactions.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Short description: A diagram showing the classification of air pollutants into primary and secondary categories with examples of each. Figure 1.1 Classification of air pollutants into primary and secondary types 1.1.2 Natural and anthropogenic sources of air pollution Air pollutants originate from two broad categories of sources: natural sources and anthropogenic (human-made) sources. Natural sources of air pollution include volcanic eruptions, which release large quantities of sulphur dioxide and ash into the atmosphere; wildfires, which produce carbon monoxide, carbon dioxide, and particulate matter; dust storms that carry fine particles across vast distances; and the decomposition of organic matter, which releases methane and other gases. Anthropogenic sources, however, are the dominant contributors to air pollution in most parts of the world. These include: • Industrial activities: factories release pollutants such as sulphur dioxide, nitrogen oxides, and heavy metals during manufacturing and energy production. • Transportation: motor vehicles, aircraft, and ships emit carbon monoxide, nitrogen oxides, and particulate matter through the combustion of fossil fuels.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS • Agricultural practices: the use of fertilisers releases ammonia, while livestock farming produces methane, both of which contribute to air pollution. • Domestic activities: cooking with biomass fuels (such as firewood and charcoal) and the use of aerosol sprays contribute to indoor and outdoor air pollution. Fill in the blank: The two broad categories of air pollution sources are __________ sources and __________ sources. Short description: A photograph or illustration showing a factory emitting smoke into the atmosphere as a typical anthropogenic source of air pollution. Plate 1.1 Industrial emissions as a major anthropogenic source of air pollution Pilot Questions 1.1 1. Which of the following is a primary air pollutant? a) Carbon monoxide (CO) b) Ground-level ozone c) Smog
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS d) Acid rain 2. Which of the following is a natural source of air pollution? a) Factory emissions b) Volcanic eruptions c) Vehicle exhaust d) Agricultural burning 3. Secondary pollutants are different from primary pollutants because they: a) Are emitted directly from factories b) Are formed in the atmosphere through chemical reactions c) Only occur naturally d) Are always in solid form 4. Which of the following is an anthropogenic source of air pollution? a) Volcanic eruptions b) Dust storms c) Motor vehicle exhaust d) Decomposition of organic matter 5. Ground-level ozone is an example of a: a) Primary pollutant b) Natural pollutant only c) Secondary pollutant d) Particulate pollutant 1.2 Health and Environmental Effects of Air Pollution 1.2.1 Effects of air pollution on human health Air pollution is one of the leading environmental causes of disease and premature death globally. The health effects of air pollution depend on the type and concentration of pollutants, the duration of exposure, and the vulnerability of the affected population.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Short-term exposure to air pollutants can cause irritation of the eyes, nose, and throat; coughing, wheezing, and shortness of breath; aggravation of existing respiratory conditions such as asthma; and headaches, dizziness, and nausea. Long-term exposure to polluted air is associated with more serious health consequences, including: • Chronic respiratory diseases such as chronic obstructive pulmonary disease (COPD) and bronchitis. • Cardiovascular diseases, including heart disease and stroke, as fine particles enter the bloodstream and affect the heart. • Lung cancer, particularly associated with long-term exposure to fine particulate matter and carcinogenic air pollutants. • Neurological effects, including reduced cognitive function and increased risk of dementia, linked to heavy metal pollutants such as lead. Vulnerable groups including children, the elderly, pregnant women, and individuals with pre-existing health conditions are disproportionately affected by air pollution. Fill in the blank: Long-term exposure to fine particulate matter has been linked to __________ cancer and cardiovascular diseases. 1.2.2 Environmental and ecological consequences of air pollution Beyond human health, air pollution has far-reaching consequences for the natural environment. These include: • Acid rain: sulphur dioxide and nitrogen oxides react with moisture in the atmosphere to form sulphuric and nitric acids, which fall as acid rain. Acid rain damages forests, acidifies lakes and rivers, and degrades soil quality. • Damage to vegetation: elevated concentrations of ground-level ozone reduce photosynthesis, weaken plants, and reduce crop yields. Particulate matter deposited on plant leaves can also block sunlight.
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