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This is about NOx, which is not healthy for humans. In regards to CO2, which is bad for the climate, Diesels are indeed better than petrol cars.

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NOx is also the biggest product of animal agriculture. It also has an effect on climate change. Global warming potential is around 300 times larger than CO2. [1]

[1]: https://en.wikipedia.org/wiki/Global_warming_potential#Value...

Not a chemist, but pretty sure Nitrous oxide (N2O) isn't in the NOx family.

True.

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