Health authorities have urged the young, elderly and those with breathing problems to limit their time outside.
The southern holiday island of Crete has been particularly badly affected, with some areas reporting dust in the air at 10 times normal levels - forcing school closures.
Meteorologists said conditions are expected to improve from Monday evening in the capital and from Wednesday in southern Greece and Crete.
Twitter users have posted images of streets and beaches across the country, which have a warm orange glow as the African dust sweeps through.
Web developer Stavros Markopoulos wrote: "Dust straight from the Saharan desert, now in Heraklion, Crete, Greece."
The Athens Observatory said on Friday that one of the largest ever transfers of desert sandfrom the Sahara to Greece took place on Thursday when the dust first arrived.
Concentrations of dust were the highest in 10 years, the Athens Observatory's meteorological service said.
Orange snow was spotted in ski resorts in Russia, Bulgaria, Ukraine, Romania and Moldova as the dust engulfed southeastern Europe.."
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African Dust Clouds Return to Athens
http://greece.greekreporter.com/2018/04/15/african-dust-clouds-retu...
University of Athens graphic showing the dust cloud
The atmosphere around Athens on Sunday was full of dust blown from North Africa, leaving the skies over Attica cloudy and visibility limited.
Dust clouds have been blown over parts of southern and central Europe this week, with doctors warning vulnerable people — the elderly, children and those with respiratory complaints — to be cautious.
Low-pressure weather in Africa is being blamed for the phenomenon which prompted doctors to urge the elderly or those with respiratory illnesses to stay indoors.
On March 26, from the northern leafy suburbs to the Acropolis and the historical centre and all the way south to Piraeus, the Greek capital was blanketed by a thick orange cloud of dust.
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