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True, it would be difficult to measure a driver's personal fuel consumption. It would not be difficult to come up with a formula that estimates particles per mile using PPM out the pipe data in conjunction with government accepted fuel economy numbers for that particular make & model of car.
Say to pass inspection you must be at or below 20PPM (random number). It doesn't seem fair that if car A puts out 20PPM pollutants and consumes a gallon of fuel per 10 miles passes inspection, while car B that puts out 25PPM but only consumes one gallon for 60 miles fails inspection. Car B is still belching out far less pollutants for any given trip.
Seems like there should be an adjustment there, but that would be logical....and we are talking about government agencies......what was I thinking!
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