The Top 10 cleanest cars, as ranked by Forbes

I came across what I would consider to be a fairly unique Top 10 list. Forbes magazine has ranked the cleanest cars on the market today. This is somewhat unique, as the editors at Forbes note, because most of the discussion involving cars and their contributions to air pollution center on fuel-efficiency. Or, as we have seen with the expanding debate over the environmental impacts of bio-fuels like corn-based ethanol, the discussion focuses on what goes into the gas tank.

The magazine's editors ranked luxury and non-luxury vehicles based on the fewest pollutants emitted, according to the federal Environmental Protection Agency.

Click here to view a slideshow of the luxury cars that made the list. Click here for the non-luxury models, like the Prius and Civic.

Not surprisingly, hybrids fare well in both rankings, according to the magazine. Three Lexus hybrids (including one with a sticker price of $104,000) topped the list of luxury vehicles that pollute the least. After the hybrids, cars with four- and five-cylinder engines came next on the list of luxury vehicles that pollute the least, including the Audi TT Roadster pictured above.

Anyway, check out the list and see what you think.

-- Scott Streater