[bumby]

I think I disagree. I think the administrative overhead makes for additional problems and is certainly imperfect at mitigating the risk.

Risk mitigation (where the risk defined here is emissions outside some acceptable threshold) usually follow this hierarchy from most preferrable to least:

- remove the hazard (make it impossible for emissions to exceed the limit, even by altering the operation)

- install an engineering mitigation (filters, def, altered fuel mapping etc.)

- administrative mitigation (training, inspections)

- protective equipment (?? make everyone in society wear a mask?)

In this framework, a technological solution is preferrable to an administrative one.