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a single polluting car emits as much NOx etc as 10s of thousands of compliant cars.

So it doesn't require a lot of people circumventing emissions to cause damage to the environment.


The information I read[0] says that a non compliant car emits about as much NOx as 4 complaint cars. I would be shocked if your figure was anywhere remotely close to true.

[0] http://www.air-quality.org.uk/26.php

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