5.3 Air Pollution

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What is a primary pollutant?

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A primary pollutant is a substance that is directly emitted into the atmosphere and can cause harm to human health and the environment. Examples include carbon monoxide, sulfur dioxide, and nitrogen oxides.

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What is carbon monoxide?

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Carbon monoxide (CO) is a colorless, odorless gas produced by burning fossil fuels. It is a primary pollutant and can be harmful to human health when inhaled.

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What are greenhouse gases?

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Greenhouse gases are gases that trap heat in the atmosphere, helping to keep the Earth's temperature stable. Key examples include carbon dioxide, methane, and water vapor.

Front

True or False: Greenhouse gases are harmful in moderate amounts.

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True. Greenhouse gases are essential for maintaining the Earth's temperature, but excessive amounts can lead to global warming.

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What is the greenhouse effect?

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The greenhouse effect is the process by which greenhouse gases trap heat from the sun in the Earth's atmosphere, keeping the planet warm enough to support life.

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What is ozone?

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Ozone is a molecule made up of three oxygen atoms. It occurs both in the stratosphere (good ozone) and at ground level (bad ozone). Good ozone protects us from harmful UV radiation.

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Where is the 'GOOD' ozone located?

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The 'GOOD' ozone is located in the stratosphere, where it forms the ozone layer that protects the Earth from ultraviolet (UV) radiation.

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What are secondary pollutants?

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Secondary pollutants are not directly emitted but form in the atmosphere through chemical reactions between primary pollutants and other substances. An example is ozone at ground level.

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What is acid rain?

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Acid rain is precipitation that has a lower pH than normal due to the presence of sulfur dioxide and nitrogen oxides in the atmosphere, which can harm ecosystems and structures.

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What are nitrogen oxides?

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Nitrogen oxides (NOx) are a group of gases that are primary pollutants produced from burning fossil fuels. They contribute to smog and respiratory problems.