
Sahara Sand Clouds Swiss Visibility After Canadian Smoke
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Nach Rauch aus Kanada trübt Saharasand die Fernsicht
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Read more: Nach Rauch aus Kanada trübt Saharasand die Fernsich
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As a result, the atmosphere is cloudy and visibility is reduced, MeteoSwiss wrote on X.
The Federal Office of Meteorology and Climatology (MeteoSwiss) published images of the cloudy visibility on this short news platform on Friday.
When Saharan dust is in the air, it reflects and scatters some of the sunlight. The sky takes on a yellowish colour and the sunrises and sunsets are more spectacular. The dust also leads to an increased concentration of particulate matter in the air.
However, the air quality was better than in the middle of the week, when the smoke from Canada polluted the air.
In Zurich, the concentration of so-called PM2.5 particles was 29 micrograms on Friday morning, according to the website of the Swiss environmental company IQAir. This is particulate matter with a diameter of less than 2.5 micrometres. The legal daily average limit is 50 micrograms per cubic metre of air.
According to the weather service, Saharan dust events contribute significantly to aerosol pollution in spring and autumn. Mineral dust is an important component of atmospheric aerosol. It originates mainly from deserts, but is also produced by soil erosion and agriculture.
The Sahara is the largest source of mineral dust, releasing between 60 and 200 million tonnes of dust per year. While the larger particles quickly fall to the ground again, the smaller ones can be carried thousands of kilometres and reach the whole of Europe.
More More Forest fires in Canada cause cloudy visibility in Swiss mountainsThis content was published on Jun 9, 2025 Despite the sunshine, the air in the Swiss mountains is not completely clear due to forest fires in Canada.
Read more: Forest fires in Canada cause cloudy visibility in Swiss mountain
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