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Natural and man-made impurities in the atmosphere, referred to as aerosols, play a huge role in the world's weather system.
"Without them, there would be no cloud cover and no rain," Andy Mussoline of State College, Pa., a meteorologist for AccuWeather, said in a telephone interview.
Mussoline explained that aerosols are fine particles of solids and liquids - but mostly solids - that are virtually minute in size. He said the atmosphere literally carries tons of these miniscule floating debris.
These aerosols comprise such things as soot and ash from fires, dust propelled into the air by gusting winds, sea spray and huge quantities of ash and droplets of gas from the eruption of volcanoes.
Mussoline said it is these floating bit particles that make the clouds. He said they provide a surface for the water vapour to condense in forming the clouds.