By George Wright, BBC News
A couple sits on Tourkovounia Hill, as southerly winds carry waves of Saharan dust, in Athens, on 23 April 2024. Photo: AFP / ANGELOS TZORTZINIS
A dramatic orange haze has descended over Athens as clouds of dust have blown in from the Sahara desert.
It is one of the worst such episodes to hit Greece since 2018, according to officials.
Greece had already been struck by similar clouds in late March and early April, which also covered areas of Switzerland and southern France.
The skies were predicted to clear on Wednesday, Greece's weather service said.
Air quality has deteriorated in many areas of the country and on Wednesday morning the Acropolis in Athens was no longer visible because of the dust.
The cloud has reached as far north as Thessaloniki.
Greeks with respiratory conditions have been urged to limit the time they spend outdoors, wear protective masks and avoid taking physical exercise until the dust clouds clear.
The Sahara releases 60 to 200 million tonnes of mineral dust per year.
The sky is covered in dust from the Sahara as seen from the premises of the Olympic Stadium in Athens, Greece, on 23 April 2024. Photo: Giorgos Arapekos / NurPhoto via AFP
Most of the dust quickly descends to Earth, but some of the small particles can travel huge distances, sometimes reaching Europe.
The atmosphere especially in southern Greece has become stifling because of the combination of dust and high temperatures.
Meteorologist Kostas Lagouvardos compared the view from one weather station to the planet Mars.
The fire service on Tuesday reported 25 wildfires in the past 24 hours.
One fire broke out near a naval base on the island of Crete - where temperatures soared above 30C - and homes and a kindergarten had to be evacuated, according to local reports.
- BBC