CNA Explains: Can cloud seeding help clear Singapore's haze?
Rain can help wash fine particles, including PM2.5, out of the air. It's a process called wet deposition, or rain scavenging. But how much pollution gets washed away depends on the rainfall, and any relief may be short-lived. During cloud seeding, tiny particles — such as silver iodide or salt — are released into suitable clouds. These help water droplets form and grow, potentially increasing rainfall. However, the method requires existing clouds and rain may fall elsewhere. During dry spells, soot and carbon particles can warm the air, making rain even less likely. Induced rain could also potentially carry pollution into water reservoirs, posing ecological and indirect human risks.
Rain can help wash fine particles, including PM2.5, out of the air. It's a process called wet deposition, or rain scavenging. But how much pollution gets washed away depends on the rainfall, and any relief may be short-lived. During cloud seeding, tiny particles — such as silver iodide or salt — are released into suitable clouds. These help water droplets form and grow, potentially increasing rainfall. However, the method requires existing clouds and rain may fall elsewhere. During dry spells, soot and carbon particles can warm the air, making rain even less likely. Induced rain could also potentially carry pollution into water reservoirs, posing ecological and indirect human risks.
Popular Shows
