You didn't define it, you just said it is widely defined. That's fine, but I prefer to understand. You don't need to define it for me, but try to define it for yourself. I mean really define it. I have no insights to give, only that really understanding something is different to believing other people really understand something.

I'm not going to delve into PM measurement techniques - you can do that on your own - but they are good techniques not some fiat imaginative propaganda vehicle like just measuring CO2 as a catchall. I find a lot of Bitcoiners can't use their intuition - rather they need the scientific breakdowns - that's fine as well just dyor. It's the same Blindspot as with Bitcoiner / saifedean takes on EVs - they don't take into account the benefit to clean air of not burning the fuel inside the metropolis.