16.2 Air Quality KEY CONCEPT Fossil fuel emissions

16.2 Air Quality KEY CONCEPT Fossil fuel emissions

16.2 Air Quality KEY CONCEPT Fossil fuel emissions affect the biosphere. 16.2 Air Quality Pollutants accumulate in the air. Pollution is any undesirable factor added to the air, water, or soil. Smog is one type of air pollution.

sunlight interacts with pollutants in the air pollutants produced by fossil fuel emissions made of particulates and ground-level ozone 16.2 Air Quality Smog can be harmful to human health. Acid rain is caused by fossil fuel emissions.

produced when pollutants in the water cycle cause rain pH to drop can lower the pH of a lake or stream can harm trees 16.2 Air Quality Air pollution is changing Earths biosphere. The levels of atmospheric carbon dioxide rise and fall over time. High levels of carbon dioxide are typical of Earths warmer

periods. 16.2 Air Quality The greenhouse effect slows the release of energy from Earths atmosphere. sunlight penetrates Earths atmosphere energy is absorbed and reradiated as heat greenhouse gases absorb longer wavelengths Greenhouse carbon dioxide

(CO ) gas molecules methane (CH ) water (H O) rerelease infrared radiation 2 4

2 16.2 Air Quality Global warming refers to the trend of increasing global temperatures. North Pole

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