Dense fog episodes twice more frequent in Bihar, Uttar Pradesh than Delhi-NCR: Study

Dense fog episodes twice more frequent in Bihar, Uttar Pradesh than Delhi-NCR: Study

Subject: Geography

Section: Climatology

Context: Dense fog episodes were at least twice as frequent in Bihar and Uttar Pradesh than in the Delhi-National Capital Region (NCR) from 2002-2020, a new study found

Concept:

What is Fog?

• Fogis a cloud that touches the ground. Fog can be thin or thick, meaning people have difficulty seeing through it
• Fog shows up when water vapor, or water in its gaseousform, condenses.
• During condensation, moleculesof water vapor combine to make tiny liquid water droplets that hang in the air. You can see fog because of these tiny water droplets

How Fog is formed?

• Fog happens when it’s very, very humid. There has to be a lot of water vapor in the air for fog to form.
• In order for fog to form, dustor some kind of air pollution needs to be in the air. Water vapor condenses around these microscopic solid particles

Fog Vs Mist:

• Fog is denser than mist. This means fog is more massive and thicker than mist
• There are more water molecules in the same amount of space in a fog.

Effects of Fog:

• Fogs reduce the near-surface visibility to less than 100 metres
• During fog flights and trains get cancelled or experience massive delays
• Vehicular accidents also occur