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GCSE Combined Science · key term
A substance whose presence or increased concentration causes harm to organisms or the environment.
Used by OCR
Specification C6.2f · Chemistry Paper 2
Revise: Atmospheric PollutantsA pollutant is a substance that causes harm to organisms or the environment when it is present in sufficient amounts. Burning fossil fuels is a major source of atmospheric pollution: vehicle engines, power stations and heating appliances all release combustion products into the air.
Chemistry, Combined Science
A substance that causes harm to living organisms or the environment when present in sufficient amounts.
Link each pollutant to its formation process and then to a specific harmful effect.
Link each pollutant to a specific effect: carbon monoxide reduces oxygen transport; particulates damage respiratory health; sulfur dioxide and nitrogen oxides contribute to acid rain.
For an emission-control question, name the pollutant, describe the method and explain why it reduces emissions.
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Burning fossil fuels supplies energy for transport, heating and electricity generation, but it also releases pollutants into the atmosphere. Increased amounts of these substances can damage human health, ecosystems and buildings. The effects depend on which substances are present: not all pollutants cause the same problems.
