The government (either state or Federal) places the amount of carbon that can be emitted from the exhaust of an engine. You can measure the exhaust gases and determine the amount of carbon. I assume the Government measures gases from different engines to get an average and have studied what they consider dangerous to the environment. I don't know the details of how they select the specific number.
They ignored the restrictions.
Which or what empire?
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Constraints.
This is mercantilism.
Jewish
There are no specific restrictions on sale and use of motor vehicles, however; dealing with stolen bikes, riding without insurance covers, and driving without a full license can be considered as few restrictions.
Yes, diesel vehicles produce carbon monoxide as a byproduct of combustion.
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Carbon is placed in the carbon group.
Constraints are limitations or restrictions that are placed upon something else. Constitutional constraints are the limitations set forth by the constitution or restrictions placed upon people that may violate their constitutional rights.