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Rubber wheels on the subway train. Quieter than steel, but I wonder about the ar quality impact and if anyone has ever measured it…

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We did a literature review as part of Vienna house. Steel systems produce more particulate, but rubber produces more chemically diverse particulate. But just looking at pm 2.5, steel produces more. I wanted to sensor Vienna house with outdoor air quality sensors, but $ diverted to PH. A worthy shift

I talked with one sensor company. Chemical makeup is important, esp with the friction heat. "Rubber" has so many additives and we don't know what they all do in the environment