Managing atmospheric pollution Revision Notes

Individuals contribute to atmospheric pollution mainly through energy use and transport choices. Reducing one’s carbon footprint involves using less energy at home by switching off unused appliances, using energy-efficient lighting, and insulating buildings to reduce heating demand. Choosing sustainable transport options such as walking, cycling, car-sharing, or using public transport reduces emissions from fossil fuel combustion.

For example, a person switching from daily car use to cycling for short journeys reduces emissions of carbon dioxide (CO2) and nitrogen oxides (NOx). This lowers their personal contribution to air pollution and climate change.

These actions are important because they reduce demand for fossil fuels, which are the primary source of many pollutants. The cumulative effect of many individuals making such changes can significantly reduce overall atmospheric pollution.

• Reducing energy use lowers CO2 emissions.
• Choosing sustainable transport cuts fossil fuel combustion.
• Small individual changes collectively impact air quality.

Governments play a key role by implementing policies that limit fossil fuel use and promote energy efficiency. Regulations may set emission limits for industries and vehicles, encourage renewable energy, and improve building standards to reduce energy consumption.

Technologies such as carbon capture and storage (CCS) trap CO2 emissions from power plants before they enter the atmosphere. CCS involves capturing CO2, compressing it, and injecting it underground into rock formations for long-term storage.

Transport policies include promoting public transport, creating low-emission zones, and encouraging electric vehicle use. For example, cities may introduce congestion charges to reduce car use in busy areas, lowering emissions of pollutants like carbon monoxide (CO) and particulate matter (PM).

• Emission limits reduce industrial and vehicle pollution.
• Carbon capture prevents CO2 release from power plants.
• Transport policies encourage cleaner travel and reduce congestion.

Atmospheric pollution is a global issue requiring international cooperation. Agreements like the Kyoto Protocol and Paris Agreement set targets for reducing greenhouse gas emissions worldwide. These agreements encourage countries to adopt cleaner technologies and share best practices.

Certain chemicals, such as chlorofluorocarbons (CFCs), damage the ozone layer, increasing ultraviolet radiation reaching Earth. Replacing CFCs with less harmful alternatives like hydrofluorocarbons (HFCs) has helped reduce ozone depletion.

International agreements also regulate pollutants like sulfur dioxide (SO2) and nitrogen oxides (NOx) that cause acid rain, coordinating efforts to reduce emissions across borders.

• Global agreements set emission reduction targets.
• Replacing CFCs protects the ozone layer.
• Cross-border cooperation reduces acid rain pollutants.

Catalytic converters fitted to vehicles convert harmful gases such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons into less harmful substances like carbon dioxide (CO2), nitrogen (N2), and water vapour. This reduces smog and health risks.

Flue-gas desulfurization (FGD) is used in power plants to remove sulfur dioxide (SO2) from exhaust gases. This process involves passing flue gases through a scrubber containing a sorbent like limestone, which reacts with SO2 to form gypsum, a useful by-product.

Governments may impose pollution taxes or carbon taxes on industries and consumers based on the amount of emissions produced. This economic incentive encourages companies to adopt cleaner technologies and reduce emissions to lower tax costs.

• Catalytic converters reduce vehicle emissions of toxic gases.
• Flue-gas desulfurization removes SO2 from industrial emissions.
• Pollution taxes motivate emission reductions economically.

Planting trees through reforestation (restoring forests) and afforestation (creating new forests) helps absorb CO2 from the atmosphere via photosynthesis. Forests act as carbon sinks, reducing greenhouse gas concentrations and improving air quality.

For example, a reforestation project planting native trees in a deforested area can sequester several tonnes of CO2 annually, mitigating climate change effects locally and globally.

These natural methods complement technological and policy measures by providing sustainable, long-term carbon storage and supporting biodiversity.

• Trees absorb CO2, reducing greenhouse gases.
• Reforestation restores degraded ecosystems.
• Afforestation creates new carbon sinks.

To understand atmospheric pollution fully, students should study a specific example, analysing its causes, effects, and management strategies.

For instance, examining the London smog of 1952 reveals how coal burning in homes and factories released large amounts of smoke and sulfur dioxide, causing severe health problems and thousands of deaths.

Management included introducing clean air acts that restricted coal use and promoted cleaner fuels, alongside technological improvements like smokeless zones and air quality monitoring. This case study illustrates the importance of combined individual, governmental, and technological actions to reduce pollution.

• Identify pollution sources and their impacts.
• Analyse policies and technologies used for control.
• Evaluate effectiveness and lessons learned.