I agree. It&#x27;s ridiculous to say that 99 parts per million of pollutants &quot;passes&quot; and 100 ppm &quot;fails&quot;. There&#x27;s no incentive to do better.<p>But a tax of $1 per ppm multiplied by the annual number of miles driven will create powerful demand by consumers for lower taxed cars, and the car makers will do what they can to meet the demand.