The celebrations were led by President Xi on July 1 at Tiananmen Square. However, to stop any rain falling on the parade, researchers at Tsinghua University found that the clouds above were laced with chemicals to reduce air pollution and guarantee clear skies.
After doing this, the rain was induced by the chemicals the night before.
The research paper said: “Results show that emergency measures played an important role in improving the air quality.
“The artificial rain on the night of June 30 bettered the air quality on July 1, but the role played by pollution reduction was primary.”
“The reason behind this phenomenon was the ‘gradual’ emergency measures, and the nearer the event drew, the stricter the measures became.”
The researchers continued: “Given that the artificial rain was the only disruptive event during the period, we can believe the sudden fall in the PM2.5 density was caused by the artificial rainfall.”
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