&gt; The simple fact is that based on the tests and the impact of NOx on population health, the sale of diesel cars should be stopped immediately<p>Extremely disingenous. You know what happens when the sale of diesel cars&#x2F;taxis&#x2F;buses stops? The old ones get driven longer.<p>You know what vehicles create the lion&#x27;s share in NOx emissions? The ones built and sold before 2000 when Euro3 emission standards started limiting NOx emissions. The majority of London &quot;quaint&quot; TX4 black cabs are of this toxic variety, as are the majority of their buses. (This is probably similar to much of the rest of Europe). Taking 50 new diesel vehicles off the street will do less than upgrading a single one of these legacy vehicles to a state-of-the-art diesel engine. Your proposed policy would be counterproductive.