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What are the worst polluters per machine: cars, motorcycles or lawn mowers?

You would think cars, but they have pollution control devices. Do motorcycles have those? And we know that lawn mowers have none. Nevermind freight transportation. This is just about private use. Thanks!
THANK YOU ALL for your contributions. I wish that I could give you all 'best answer' status. Thanks for responding.

This is a question where we can have some fun with statistics--you could count "worst polluter" several different ways. Of course, there is a wide range of machines as well. A 1956 Cadillac makes a whole lot more pollution (by any measure) than a 1989 Geo Metro in identical mechanical condition. And of course, a malfunctioning machine can make more pollution than one in perfect working order. And of course there's the kind of pollutant, which also varies. So, here goes:

Method 1: pollution per gallon of fuel. Two-stroke motorcycles win, hands down. The gas/oil mix they burn puts loads of thick smoke into the air. 2nd place goes to lawnmowers, with low compression and no emission controls. 4-stroke motorcycles place 3rd, they have about as much emission control as a car built in 1973. Cars win, car exhaust from a modern car is loaded with CO2 and not much else.

Method 2: Pollution over the life of the vehicle. Cars win. First off, manufacturing--cars are bigger and require more metal, meaning more energy to manufacture. Then fuel--An average car goes over 150,000 miles in it's lifetime, at 20 mpg that's 75,000 gallons of fuel. Even with fantastic emission controls, burning that much fuel just means more pollution. The pollution gets worse towards the end of a car's life, since it is likely to have more malfunctions--oil leaks and the like.
2nd place is the motorcycle. Few motorcycles go even 100,000 miles, and they average over 40 mpg. Less fuel burned means less pollution. 2-stroke motorcycles don't age well, very few of them manage as many miles.
3rd place is lawn mowers. Most people use about 5 gallons of fuel per year, and never change the oil.

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