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What is carbon monoxide (CO)?

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A colorless, odorless gas produced by incomplete combustion, which can be deadly if inhaled.

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What is tropospheric ozone?

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An atmospheric compound that protects against UV radiation but contributes to photochemical smog and health problems when found near the ground.

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What is particulate matter?

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A type of pollution consisting of tiny particles like pollen, dander, soot, and dust, found both indoors and outdoors.

Front

Why is particulate matter of 2.5 micrometers or smaller more dangerous?

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It can penetrate deep into the lungs, leading to severe respiratory problems and heart disease.

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What are the sources and effects of sulfur dioxide (SO2)?

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Produced from burning coal and oil, especially in the Eastern US; causes breathing problems and is an ingredient in acid rain.

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What is the primary health effect of nitrogen oxides (NOx)?

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They can cause respiratory issues and contribute to the formation of ground-level ozone.

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What is the role of stratospheric ozone?

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It protects the Earth from harmful UV radiation.

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What is photochemical smog?

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A type of air pollution formed by the reaction of sunlight with pollutants like volatile organic compounds (VOCs) and nitrogen oxides.

Front

What are volatile organic compounds (VOCs)?

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Organic chemicals that can evaporate into the air and contribute to air pollution and health problems.

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What is acid rain?

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Precipitation that contains high levels of sulfuric or nitric acids, often resulting from air pollution.