how does dust particles in air help in causing rain?

Dust particles provide surface to the water vapors present in the atmosphere to condense. The vapors condense on these particles and together they form clouds.  When the clouds no longer can hold these water vapors because of saturation, then they fall on earth in the form of rain.

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Dust in the air is often small enough that it stays aloft. When the raindrops hits (impinges on) the particulate it it wets and entrains them (as particulate in the drops) The droplets with the entrained dust particles are heavy enough to fall down along with the raindrops, reducing the dust particles or even eliminating them all from the air stream.

This is the same principle as used in dust removal systems in industrial systems (wet scrubbers) where a artificial rain of droplets flows countercurrent to a dusty gas stream to remove the dust and/or soluble chemical droplets.

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The biggest utility of dust particles is that they help in the formation of rains. The water vapor in the clouds condense on dust particles in the form, of water drops. These drops fall on to the earth as rains. The absence of dust particles can delay the rain. Likewise, mist, fog etc. are also formed due to the presence of dust particles in, the atmosphere.

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The biggest utility of dust particles is that they help in the formation of rains. The water vapor in the clouds condense on dust particles in the form, of water drops. These drops fall on to the earth as rains. The absence of dust particles can delay the rain. Likewise, mist, fog etc. are also formed due to the presence of dust particles in, the atmosphere.

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