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Saharan dust smothers Switzerland, southeast France
An exceptionally rare haze of Saharan dust cloaked Switzerland and southeastern France on Saturday, sparking health warnings as a yellow hue tinged the sky.
The phenomenon, which began in Switzerland on Friday, brings with it "a very clear worsening of sunlight and visibility. Added to that is an increase in concentrations of fine particles", the MeteoSuisse weather service posted on X.
With the dust concentrated at lower than 3,000 metres (around 9,800 feet), air quality was especially affected, with Switzerland's airCHeck monitoring application flagging high levels of pollution in a corridor stretching from the southwest to the northeast.
Calculations estimate that the amount of dust reached around 180,000 tonnes, double the levels recorded during recent similar events, SRF Meteo forecaster Roman Brogli told public radio.
In neighbouring France, local authorities in the southeast and south announced that the air pollution threshold was breached on Saturday, with the Herault department asking residents to avoid intense physical effort, particularly those with heart or respiratory problems.
The Sahara desert releases 60 to 200 million tonnes of mineral dust per year. While the largest particles come rapidly back down to earth, the smallest can travel thousands of kilometres.
The sand gives an orange tint to snow and can impact melting processes, notably for glaciers, which are shrinking as average temperatures rise, by reducing the ice's ability to reflect sunlight.
The situation is due to improve in France and Switzerland on Sunday.
R.Adler--BTB