Environment

Have you noticed it? That fine, snow-like layer of white powder in certain French towns? 

Over the past few days, this white powder has covered the ground, houses, trees... parts of the French landscape. While no disturbances were forecast, and no snowfall had been announced by Météo France, a white coat has appeared in some towns, making local people wonder. Contrary to popular belief, these white particles are not 100% natural, as they are, in fact, industrial snow. 

As reported by Demotivateur, this is a localized phenomenon found in certain conurbations. Météo France explains: “During periods of calm, cold weather during the winter, despite the absence of any disturbance, snow can sometimes fall in certain conurbations or near industrial complexes. Linked to the combination of specific winter weather conditions and human activities, this snow is referred to as industrial, urban or pollution snow.” 

Industrial snow, but what else?

Are you wondering what industrial snow is? It's “snowflakes” which form when several conditions come together: a polluted environment and a particular meteorological episode, in this case a winter anticyclone. The anticyclone acts as a “lid” on areas concerned, trapping humidity and fine airborne particles. These particles, which are emitted by human activity, transform into condensation nuclei. Water vapour agglomerates around these nuclei, forming snowflakes, says Demotivateur. 

Météo France goes on to point out: “Pollution from industry, traffic and heating appliances load the ambient air with additional moisture, as well as small solid particles known as condensation nuclei.” 

Snowfalls pose no health risk, but like natural snow, they reduce visibility and make roads slippery. So drive carefully!

(MH with AsD - Source : Demotivateur - Illustration : Unsplash)