How can unwanted sound harm people and wildlife, and how is it measured?
Topic 7.8 Noise Pollution: identify the sources of noise pollution and describe its effects on humans and wildlife.
A focused answer to APES Topic 7.8, covering the sources of noise pollution, the decibel scale, the effects on human health and on wildlife (stress, hearing damage, disrupted communication and migration), and how to reduce it, with a worked decibel reasoning example.
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What this topic is asking
The College Board (Topic 7.8) wants you to identify the sources of noise pollution and describe its effects on humans and wildlife.
Sources of noise pollution
Effects on humans
Effects on wildlife
Reducing noise pollution
Why this matters
Noise pollution rounds out Unit 7 as a pollutant that is not a chemical but still causes real harm to human health and wildlife. It connects to urbanization (Unit 5), to human health (Unit 8) and to biodiversity (animals displaced by noise), and it tests whether you can distinguish it from chemical, thermal and nutrient pollution.
Try this
Q1. Identify two sources of noise pollution. [1 point]
- Cue. Any two of traffic, aircraft, industrial machinery, construction, shipping or sonar.
Q2. Explain how underwater noise pollution harms marine mammals. [2 points]
- Cue. Whales and dolphins rely on sound to communicate, find food and navigate, so ship and sonar noise interferes with these abilities, causing stress, disorientation and sometimes strandings.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2022 (style)4 marksSection II (FRQ). (a) Identify two sources of noise pollution. (b) Describe one effect of noise pollution on human health. (c) Describe one effect of noise pollution on wildlife. (d) Describe one method to reduce noise pollution.Show worked answer →
A 4-point FRQ on noise pollution.
(a) Identify (1 point): any two of traffic, aircraft, industrial machinery, construction, or shipping and sonar in the ocean.
(b) Describe (1 point): chronic noise raises stress, disturbs sleep, raises blood pressure, and loud noise can cause hearing loss.
(c) Describe (1 point): noise interferes with animal communication, mating calls and navigation; ocean noise disrupts whales and other marine animals that rely on sound.
(d) Describe (1 point): sound barriers along roads, quieter technology, restricting noisy activity to certain hours, or buffer zones and regulations.
Markers reward two valid sources, a valid human health effect, a valid wildlife effect, and a valid reduction method.
AP 2019 (style)1 marksSection I (multiple choice). A major effect of underwater noise pollution from ships and sonar is that it: (A) raises ocean temperature (B) interferes with the communication and navigation of marine mammals (C) acidifies seawater (D) adds nutrients that cause algal blooms. Justify your choice.Show worked answer →
A 1-point MCQ on noise pollution. The answer is (B).
Many marine mammals, such as whales and dolphins, rely on sound to communicate, find food and navigate; ship and sonar noise interferes with these abilities, disorienting and stressing them. Noise does not raise ocean temperature (A), acidify seawater (C) or add nutrients (D), which are separate pollution problems. The trap is confusing noise pollution with thermal, chemical or nutrient pollution.
Related dot points
- Topic 7.1 Introduction to Air Pollution: identify the major air pollutants and their sources and distinguish primary from secondary pollutants.
A focused answer to APES Topic 7.1, covering the major air pollutants, their natural and human sources, the criteria pollutants, and the distinction between primary and secondary pollutants, with a worked emissions calculation.
- Topic 5.10 Urbanization: explain the environmental effects of urbanization, including impervious surfaces, runoff, the urban heat island, sprawl and saltwater intrusion.
A focused answer to APES Topic 5.10, covering urbanization, impervious surfaces and increased runoff, the urban heat island effect, urban sprawl, depletion and saltwater intrusion, and the benefits of smart growth, with a worked impervious-surface calculation.
- Topic 7.6 Reduction of Air Pollutants: describe methods used to reduce air pollution, including regulation, scrubbers, catalytic converters and cleaner fuels.
A focused answer to APES Topic 7.6, covering methods to reduce air pollution including the Clean Air Act and regulation, scrubbers and electrostatic precipitators, catalytic converters, vapor recovery, cleaner fuels and renewable energy, with a worked scrubber efficiency calculation.
- Topic 8.14 Pollution and Human Health: describe how pollutants and pathogens affect human health and how infectious diseases spread through the environment.
A focused answer to APES Topic 8.14, covering the health effects of pollutants (heavy metals, particulates, toxins), waterborne and infectious diseases (cholera, typhoid, dysentery), pathogens and disease vectors, the difference between acute and chronic effects, dysentery and access to clean water, and prevention, with a worked disease-rate reasoning example.
- Topic 8.6 Thermal Pollution: explain how thermal pollution occurs and why warmer water harms aquatic ecosystems.
A focused answer to APES Topic 8.6, covering how thermal pollution occurs (power plant cooling water), why warm water holds less dissolved oxygen, the effects on metabolism and aquatic life, thermal shock, and how to reduce it with cooling towers, with a worked oxygen-solubility reasoning example.
Sources & how we know this
- AP Environmental Science Course and Exam Description — College Board (2020)