Hacker News Reader

Nitrogen oxides and VOC/Hydrocarbons along with sunlight form ozone, its doesn't come directly out of the exhaust. Carbureted two-stroke engines emit large quantities of hydrocarbons compared four-stroke even without emissions gear like a cat. This is due to the the intake and exhaust port being open together for a period of time on a two-stroke, certain amount of unburned fuel goes directly out the exhaust, this is why they are so bad. It's the VOC they are emitting that can then form ozone.

Pointing out two-stroke engines produce dangerous amounts of ozone is great. Using a numerical comparison to cars in order to generate fear in the reader is moronic and manipulative.

It's reasonable to point out that even though they're both gas engines, one produces an absurd multiple of the more volatile pollutants of the other.

Well said. I get so tired of these also.