Question

Differentiate between fog and smog.(3 points)

Answer 1

Fog is condensed water vapor on tinny nuclei or pollutant, thus fog is basically suspended tinny water droplets floating in air. The droplets scatter light equally at all optical wavelengths and that makes its appearance as white. The nuclei is basically dust but in cities, thousands of other kinds of particles are there.

Smog is fog + smoke, it is seen in big cities or we say, in big cities, fog is always a mixture of fog and smog. Smog is blackish in nature usually but its color may change depending upon the color of other pollutants present in the atmosphere.

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Answer 2

FOG
Fogs are composed of water droplets, which disperse light and reduce visibility near the earth’s surface. Fog layers form when moist air is cooled to its dew point (or saturation point). There are several different types of fog, which are formed under varying circumstances.

Radiation fog typically forms at night when surface heat is radiated into space. As the earth’s surface cools, the air reaches complete humidity, which then turns into fog.

SMOG
In the early 20th century, smog originated as a blend of smoke and fog. In 2011, it is defined as mix of ground-level ozone and other pollutants. Ground-level ozone, unlike the earth’s elevated ozone layer, can cause choking, coughing and other health problems.

Smog forms when organic compounds and nitrogen oxides chemically react with sunlight to create ozone. These pollutant compounds often come from automotive exhaust, factories, power plants and even your hairspray.