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Section 1: The Air Around You


The condition of Earth's atmosphere at a particular time and place.


The envelope of gases that surrounds the planet.

Water Vapor

Water in the form of a gas.


Harmful substances in the air, water, or soil.

Photochemical Smog

A brownish haze formed when pollutants react with each other in the presence of sunlight.

Acid Rain

Rain that contains more acid than normal

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