Dust particles in atmosphere are significant because ........

World Geography (Easy) World climates

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Dust particles in atmosphere are significant because :

They act an hygroscopic nuclei around which water vapour condenses to produce clouds

They intercept and reflect insolation

They produce marvelous optical phenomenon of red and orange hues is the sky at the sunrise and the sunset

All of the above.

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Explanation:

Given the wide variety of pollutants and chemical compositions involved, dust particles play a role in many air pollution issues. These include: transboundary transport of air pollutants as fine particles. light scattering leading to the potential to offset global warming.
Dust is a vital component of the atmosphere for many reasons. One is providing something for water to condense on. A lot of people don't realize that if it wasn't for particulate matter such as dust and smoke, we would have no clouds or precipitation. If enough dust gathers in the atmosphere, it can block radiation. Hence option 4th is correct.