Fog Vs Smog | The Science behind

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When you look up at the sky, you may notice low grayish clouds in the sky. Is it smog or fog? Though they look the same, smog and fog are formed quite differently. Smog is a form of air pollution, resulting from chemical toxins dispersed into the atmosphere whereas fog is the accumulation of floating water droplets in the air.

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).
Evaporation or mixing fogs occur when water vapor (from evaporation) mixes with cooler, drier air. Steam fog forms when cooler air drifts over warm water, whereas frontal fog forms when warm rain droplets evaporate into cooler air near the surface.Evaporation or mixing fogs occur when water vapor (from evaporation) mixes with cooler, drier air. Steam fog forms when cooler air drifts over warm water, whereas frontal fog forms when warm rain droplets evaporate into cooler air near the surface.

Smog, community-wide polluted air. Its composition is variable. The term is derived from the words smoke and fog, but it is commonly used to describe the pall of automotive or industrial origin that lies over many cities.
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