Actually no. The EPA ratings on emissions are reported in grams of pollution emitted per mile travelled, not in concentration (ppm).Holicow said:Right figgy: It's not the rating but the volume.
However, you do need to exercise care in comparing the *LEV standards across vehicle classes, because they vary. You can see this represented graphically here. This will change as the new Tier 2 standards phase-in from 2004 to 2009, and by 2010 all cars and light-duty trucks will have the same standards. In the meantime, you can rely on the EPA's "emissions/air pollution score" which rates all vehicles on a 1-10 scale (details here). This aggregate score (pounds of smog-forming pollution per 15k miles) is independent of vehicle class and model year.
On that scale, Honda Insight CVT is variously rated 6,8,or 10 while Honda Insight 5spd is rated 6 or 7. Ford Focus is 9 or 10. Ford Rangers, on the other hand, max out at 6 and are as low as 4.
For overall "greenness" you can also look to the ratings of the "Greenest Vehicles of 2004" put out by the ACEEE Green Book, which is an attempt to combine multiple environmental costs, including tailpipe emissions, greenhouse gas emissions, and production-associated impacts. The Honda Insight has been their top-rated gasoline-burning automobile for many years.