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</html><description>During the Silvester fireworks in and around Z&#xFC;rich, many of you probably noticed that the air became foggy at some point. This can be explained by particles, emitted from the fireworks, accumulating in the boundary layer and acting as condensation nuclei for water droplets, which together with the air moisture and temperature led to fog [&hellip;]</description><thumbnail_url>https://blog.zhaw.ch/metenvia/files/2026/01/Picture1.png</thumbnail_url><thumbnail_width>1386</thumbnail_width><thumbnail_height>588</thumbnail_height></oembed>
