Comment by throwaway2037

About OP: I swear, there is a HN "rule": When there is any opportunity to discuss health scare conspiracy theories, someone will pop into the convo (wearing a tin foil hat, naturally) to add their two cents. It is the perfect embodiment of Brandolini's law.

    > The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.

As a counterpoint to "avoiding rubber tyred metro lines like the plague": Does this person also avoid all road tunnels or expressways underground? Since there are frequently multiple lanes in each direction, that would mean much more fine rubber particulates from car & truck tyres compared to a metro with much less frequent trains and only one track in each direction.