So physics can tell politics how to balance health and costs

For some episodes I’ve been doing a mini course in aerosol physics for the common man who hates formulas but loves physics. Since some time has passed, I’ll help you find the previous articles: 7 and 8 January, “La forza dell’aerosol”; Monday 16 January “How to fight air pollution: physics helps”; Monday 23 January, “The physics of everyday life: the great agitation of particles”; Friday 3 February, “The perfect filter exists. But there is a good price to pay”. You understand that I’m doing something inconvenient: the disclosure made by whoever does, and has done, the things he says, and not by whoever says the things he gets told by whoever does them, to explain them to others. Maybe without fully understanding them himself. The British, who know how to do this, force the coordinator of a research project to spend two percent of the entire budget directly on dissemination. This pistol to introduce the explanation of the last of the forces acting on particles suspended in a fluid, diffusiophoresis. A little more complicated than the other forces, it requires more concentration from the reader. But it’s worth it because with the knowledge of all the forces we can perfect the technologies for separating the particles from the gas fluid that hosts them, thus preventing man from hurting himself by breathing trash. Not to mention the greater respect for the planet and its biosphere that is obtained in this way.