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Introductory Guide to Fog, Haze, Smog and PM2.5

China.org.cn, February 26, 2013 Adjust font size:

• Fog is a collection of liquid water droplets or ice crystals suspended in the air at or near the Earth's surface.

• Haze is traditionally an atmospheric phenomenon where dust, smoke and other dry particles obscure the clarity of the sky.

• Smog is a type of air pollution; the word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky fog.

• PM2.5 particles are air pollutants with a diameter of 2.5 micrometers or less, small enough to invade even the smallest airways.

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