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