Delhi’s Big Gamble: Making Artificial Rain to Fight Air Pollution

Delhi, India’s capital, is facing one of its worst air pollution crises. In a bold move, the city is trying something old and new: artificial rain. For the first time in nearly fifty years, an experiment called cloud seeding is underway to wash away the toxic smog. This pilot project, led by the Indian Institute of Technology (IIT) Kanpur and backed by the Delhi government, is a desperate attempt to clean the city’s air.

On a recent Tuesday, a small plane, a Cessna 206H, took off from the IIT-Kanpur airstrip. Its mission was to fly over the National Capital Region (NCR) and release special chemicals into the clouds to create rain.

What is Cloud Seeding, Simply Put?

Think of a cloud as a sponge full of tiny water droplets. Cloud seeding is simply a way to make that sponge heavier so the water falls out as rain.

It’s a weather modification trick where scientists release very fine particles of chemicals into the right type of clouds. The main chemicals used are silver iodide and sodium chloride (common salt). These particles act like tiny seeds, giving the water vapor in the cloud something to stick to. As more water sticks to the seed, it grows into a big, heavy raindrop that eventually falls to the ground.

This technique is used globally for a few reasons:

• To create more rain in areas suffering from drought.
• To reduce large hailstones that can damage farms.
• To clear away fog and smog in big, polluted cities.

 The First Mission: How the Experiment Works (Cloud Seeding Delhi)

The Director General of Civil Aviation (DGCA) gave special permission to IIT-Kanpur to run these test flights between October 1 and November 30, 2025. Because Delhi’s main airport is so busy, the research plane is flying out of Kanpur and landing in Meerut to avoid disrupting normal flights.

Environment Minister Manjinder Singh Sirsa explained that the project is crucial. Its main goal is to “test if cloud seeding can truly be a tool to fight pollution” in one of the world’s most polluted urban zones.

The very first official trial happened on October 23. The four-hour flight path was complex, covering areas like Kanpur, Meerut, Burari, and Aligarh. During the operation, the plane released the silver iodide and sodium chloride particles into specific clouds. Eight chemical flares were deployed to seed the clouds over areas known for high pollution, such as Burari and Mayur Vihar.

Key results from the first test:

• Experts proved the technology and coordination between different government groups were ready.
• However, the atmosphere’s humidity was only 15% to 20%. Experts say you need at least 50% humidity for a truly successful rain-making effort.
• Because of the low moisture, no immediate rainfall was observed.

 What Scientists Say Makes or Breaks the Rain

Scientific success in cloud seeding isn’t guaranteed; it depends on the weather. Dr. Thara Prabhakaran, an IITM cloud seeding expert, points out that factors like how much moisture is in the air, the shape of the clouds, and the air’s temperature are all critical.

She notes, “Cloud seeding needs the right kind of clouds and enough moisture. We got some moisture from weather systems coming from the Arabian Sea, which was a good sign, but the process is still very hard.”

Meteorologist Mahesh Palawat added that the height of the clouds is also a huge factor. “If the cloud base is very high, like 10,000 feet, seeding is tough. But if the cloud is lower, below 5,000 feet, the chances of rain are much better.”

 A Global Solution to Smog

Delhi is not the first to try this. According to the World Meteorological Organization (WMO), more than 50 countries, including the United States, China, and the UAE, have used cloud seeding.

Their goals are often similar to Delhi’s: to create rain during droughts, improve the water supply for farming, and clear pollution and fog in major cities.

However, experts worldwide agree on one thing: it’s difficult to prove exactly how much rain the seeding created versus how much would have fallen naturally. Plus, the long-term impact of using chemicals like silver iodide on the environment needs much more study.

 Why Delhi is Desperate for a Washout

Delhi’s air quality gets dangerously bad every year, especially in the winter. The pollution comes from a combination of sources:

• Farmers burning crop stubble in nearby states.
• Heavy pollution from cars and factories in the city.
• Firecracker smoke from festivals like Diwali.

This year, a thick layer of smog settled over the city right after Diwali, despite bans on traditional fireworks. The government hopes that by using artificial rain, they can literally wash the pollutants out of the sky, providing temporary relief and improving the terrible Air Quality Index (AQI) readings.

 The Cost and What’s Next

The Delhi government has committed around ₹3.21 crore (about $385,000 USD) for five cloud-seeding trials with IIT-Kanpur. The tests are focused on highly polluted areas in northwest Delhi, such as Rohini and Pitampura.

Future Plans Include:

1. A third trial is planned for later this week, weather permitting.
2. All the data from the five trials will be put into a scientific report.
3. If the experiments work well, artificial rain could become a regular part of Delhi’s plan to fight pollution every winter.

 A Word of Caution from Environmentalists

While the idea of clean air is exciting, not everyone is fully onboard. Environmentalists have raised serious concerns:

• Toxicity: The chemical silver iodide can be toxic to fish and other aquatic life.
• Long-Term Effects: Scientists still don’t fully understand how the chemical will affect the soil and water quality over many years.
• Unintended Damage: If the seeding isn’t monitored correctly, it could lead to unexpected harm to the environment.

Experts are urging the government to use caution and conduct continuous studies after every trial.

 Hope for a Healthier City

Delhi Chief Minister Rekha Gupta called the experiment a “necessity” and a brave step to fix the capital’s environmental crisis. She stated, “Cloud seeding is not just an experiment—it’s a hope for Delhi’s residents. If successful, it could change how we fight pollution forever.”

Many people in Delhi are hopeful for rain, though others wonder if this temporary fix is worth the high cost.

In conclusion, Delhi’s first attempt at cloud seeding is a clear sign that the government is trying new, scientific solutions to manage its pollution problem. Even though the first trial didn’t bring immediate rain, it proved the technical capabilities are in place. If the upcoming trials are more successful, artificial rain may soon become a vital tool in the annual fight for cleaner air in the capital.