Cloud Seeding & Artificial Rain

• As Delhi struggles with severe air pollution, the idea of cloud seeding has come up as a possible short-term solution to improve the city's air quality.
• The Air Quality Index (AQI) in Delhi has been in the “severe plus” category for several days, with readings consistently above 450, which is very unhealthy.
• On 19 November 2024, Delhi Environment Minister Gopal Rai asked the Central Government for help and requested Prime Minister Narendra Modi to assist in making artificial rain happen to fight the growing air pollution in Delhi.

WHAT IS CLOUD SEEDING?

• Cloud seeding, also called artificial rain, is a method used to change the weather and encourage rain.
• It works by adding certain materials to the clouds to make them release rain.

How Does Cloud Seeding Work?

• The process involves putting materials like silver iodide, potassium iodide, or dry ice into the clouds.
• These materials act like seeds that water droplets can form around, making the clouds heavier and causing them to release rain or snow.
• The materials added to the clouds help boost rainfall by giving water droplets a place to form and grow.

How is Cloud Seeding Done?

• Cloud seeding can be done in different ways, including:
  • Aircraft flying through clouds to release the seeding materials.
  • Generators on the ground that send particles into the air.
  • Sometimes, rockets are used to send seeding materials into the clouds.

• In addition to increasing rain, cloud seeding is also thought to help clear pollutants from the air.
• The idea is that rainfall will help to settle down dust and other harmful particles, temporarily improving the air quality by removing airborne pollutants.

• The Delhi government has been considering cloud seeding as a way to reduce the constant air pollution.
• The Indian Institute of Technology (IIT) Kanpur has proposed a cloud seeding project to the Delhi government.
• The estimated cost for the project is about Rs 1 lakh per square kilometer.
  • The project is under review by the Delhi government.

• Some studies have shown small increases in rain due to cloud seeding, but it is unclear if it has any lasting effect on air quality.
• Experts warn that cloud seeding should not be seen as a long-term fix for air pollution.
• It may give some temporary relief, but it doesn’t tackle the main causes of pollution.

PROBLEMS WITH CLOUD SEEDING

• Right Weather Conditions:
  • Cloud seeding works only if there are the right weather conditions, like clouds with enough moisture.
  • If the weather is not right, cloud seeding may not be effective.
  • Delhi’s current weather may not always be good for cloud seeding to work.
• Temporary Impact:
  • Even if cloud seeding leads to some rain, experts believe it will only help in the short term.
  • It won’t fix the main reasons for the pollution, like vehicle emissions, burning of crops, and industrial pollutants.
• Environmental Concerns:
  • There are worries about the environmental impact of using chemicals in the air for cloud seeding.
  • The long-term effects of adding these chemicals to the atmosphere are still not well understood.
  • Some experts say that instead of relying on cloud seeding, the focus should be on reducing pollution at its source, such as through stricter laws on emissions from cars and industries.

THE NEED FOR LONG TERM SOLUTIONS

• While cloud seeding might bring temporary relief, experts stress that long-term solutions are needed to solve the pollution problem. These should include:
  • Stronger pollution controls for industries.
  • Cleaner vehicles with lower emissions.
  • Better waste management and cleaner energy sources.

• Rather than depending on technology like cloud seeding, experts say the focus should be on solving the real causes of pollution, such as cutting down on car emissions, open crop burning, and moving to cleaner energy sources.
• To improve air quality in Delhi for the long term, sustainable changes are necessary, focusing on pollution prevention rather than relying on temporary fixes.