What is Cloud Seeding?, Method, Work, Application

Cloud seeding is a weather modification technique that improves a cloud's ability to produce rain. Learn about the techniques, benefits of Cloud seeding in detail.

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Context: The Delhi Environment Minister has called on the central government to convene an urgent meeting to assess the feasibility of cloud seeding in the capital to tackle pollution levels.

What is Cloud Seeding?

It is a scientific process that improves a cloud’s ability to make rain or snow, as well as control other weather events.
Chemicals Used: Silver Iodide, Potassium Iodide and Dry ice (solid carbon dioxide).

Cloud Seeding Methods

Hygroscopic Cloud Seeding

In this method, Salts are dispersed into the lower parts of clouds using flares or explosives. These salts attract water, causing them to grow larger.
As the salts increase in size by attracting water, they become heavy enough to fall as rain.

Static Cloud Seeding

Chemicals like silver iodide are spread into the clouds.
Silver iodide acts like a tiny ice crystal around which moisture can gather.
- Moisture is already present in the clouds, Silver iodide makes it easy for clouds to turn its moisture into rain.

Dynamic Cloud Seeding

This method aims to boost vertical air currents, which encourages more water to pass through the clouds, translating into more rain.

How does Cloud Seeding help to reduce pollution?

Cloud seeding helps in washing away pollutants like sulphur dioxide, nitrogen oxides, and particulate matter.
Artificial rain increases the humidity in the air. Humidity helps to trap pollutants and prevent them from dispersing thus decreasing air pollution levels.
Cloud seeding can help disperse smog and haze, making the air clearer and more breathable.