Noise — AQA A-Level Environmental Science

Noise pollution is a form of physical environmental pollution caused by unwanted or excessive sound. It is generated mainly by transport (road, rail, air), industry, construction, and recreational activities. Unlike chemical pollutants, noise is transient and does not persist in the environment, but it can cause immediate and cumulative harm to human health and wildlife.

In the AQA A-Level Environmental Science specification, noise is studied as part of pollution management. Students must understand how noise is measured, its effects on health and ecosystems, and the range of control measures including legislation, planning, engineering, and behavioural change. This topic links to wider themes of sustainable development, environmental health, and the precautionary principle.

• →Noise is measured in decibels (dB), with A-weighting (dB(A)) used to reflect human hearing sensitivity; common thresholds include 85 dB(A) for workplace hearing damage and 55 dB(A) for night-time environmental guidance.
• →Major sources include road traffic, railways, aircraft, industrial machinery, construction, and domestic activities; road traffic is the most widespread source in the UK.
• →Health impacts include hearing loss, sleep disturbance, cardiovascular effects, and cognitive impairment in children; ecological impacts include masking of mating calls and altered behaviour in birds, marine mammals, and amphibians.
• →Management strategies operate at source (quieter engines, low-noise road surfaces), along the path (acoustic barriers, insulation), and at the receiver (double glazing, planning controls).
• →UK legislation includes the Environmental Noise Regulations 2006, which require noise mapping and action plans for major agglomerations and transport corridors.

• Identifies acoustic insulation as a measure that reduces sound energy travelling along the path from source to receiver.
• Explains that insulation reflects, absorbs or damps sound so the level reaching a receptor falls.
• Links insulation to reduced annoyance or sleep disturbance for people near a noise source.
• Recognises that insulation does not remove the noise source and is often combined with other controls.

• 💡Name the specific pathway the insulation interrupts, such as air-borne sound passing through a wall or window.
• 💡Give a concrete receptor, such as residents beside a road, to show why the reduction matters.
• 💡State the limitation that the source still operates, so insulation is one part of a wider noise strategy.
• 💡Always use the correct unit dB(A) when discussing environmental noise and link it to a specific threshold or guideline to show precise knowledge.
• 💡When evaluating management strategies, give a quantified reduction (e.g. barriers reduce noise by 5-10 dB(A)) and state a limitation to reach the top mark band.
• 💡Include named examples such as the UK Environmental Noise Regulations 2006 or specific species like great tits altering song frequency in urban areas to demonstrate application.

• Treats acoustic insulation as removal of the noise source; correct this by describing it as a path control that lowers sound reaching the receptor.
• Confuses insulation with land-use zoning; keep the two distinct by stating that insulation acts on the sound pathway rather than on where activities are located.
• Assumes insulation eliminates all noise; correct this by saying it reduces sound levels rather than removing them entirely.
• Students often think noise pollution only affects humans. Correction: wildlife is also affected through masking of acoustic communication, leading to reduced breeding success and displacement.
• Students frequently confuse dB and dB(A). Correction: dB is a raw measure of sound pressure level, while dB(A) applies a frequency weighting to approximate human loudness perception and is the standard for environmental assessment.
• Students may believe that noise disappears immediately and has no long-term effects. Correction: chronic exposure causes cumulative health effects such as hypertension and sleep disorders, and ecological impacts can persist through altered species behaviour.

1. 1Day 1-2: Learn definitions, units (dB and dB(A)), and common noise thresholds; create a table of sources and their typical dB(A) levels.
2. 2Day 3-4: Study health and ecological impacts with named examples; practise explaining masking and sleep disturbance in your own words.
3. 3Day 5-6: Research UK legislation and management strategies; make a summary sheet of source-path-receiver controls with advantages and disadvantages.
4. 4Day 7-8: Complete past-paper questions on noise, focusing on 6-mark evaluate questions; mark your answers against the scheme and note missing terminology.
5. 5Day 9-10: Use active recall and flashcards to test thresholds, legislation names, and example species; revisit any weak areas.

• 📋Definition and measurement questions: 'State the unit used to measure environmental noise and explain why A-weighting is applied.' Advice: always mention dB(A) and human hearing response.
• 📋Impact analysis questions: 'Describe two effects of noise pollution on human health and two on wildlife.' Advice: use specific examples and avoid vague terms like 'stress'.
• 📋Management evaluation questions: 'Evaluate the effectiveness of acoustic barriers and low-noise road surfaces in reducing traffic noise.' Advice: give quantified reductions and limitations, then conclude which is more effective.
• 📋Data interpretation questions: 'Using the graph, compare noise levels at different times of day and suggest reasons for the pattern.' Advice: quote data with units and link to traffic volume or human activity.