Can Rain Wash Away Pollution?

Unfortunately, it can’t. During the heaviest rains, rainfall reduced small particles by just 8.7%. For light to medium rain, the effect on PM2.5 was close to zero. Even for large particles, the effect of moderate rain was close to 10% or less. The most violent rains had an effect closer to 30%. So why is the sky sometimes so blue after it rains? The key is that when it rains, there are other elements like the wind—moving air. When strong winds are present, they blow particulate away.

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