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You can't do PPP across cultures that have no bearing one another, so it's utterly ridiculous to do a 'GDP' measure.

How much did the Romans value 'clean air'? Because they don't breathe fumes, whereas we do.

'Comparative Value' makes it impossible.

We can only say: "this is what the average Romand had and did - and this is what the average American/European/Asian has" etc..

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Haha. They breathed tons of fumes, most of their households' cooking and heating was fueled with either wood, charcoal or dung, in open or not-well-sealed hearths. (Woodsmoke is still the world's deadliest source of pollution.) Roman cities especially were ferociously polluted.

If there is a stove-pipe then they are not breathing any fumes.

A lot of stovepipes leak fumes, an in any case most people in the Roman empire had no such thing as a stovepipe. It's absolutely a myth that most premodern people had "clean air". No, it was generally filled with smoke, dung dust, mold spores, etc.

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