In the specific instance you’re talking about, they were looking at “unburt hydrocarbons”, or essentially fuel/oils in the air.
Due to the nature of two-stroke engines, this is a inevitable result, but in four-stroke engines, it is nearly impossible. Thus, the levels are wildly higher with the leaf blower (vs the car).
The carbon monoxide and nitrogen oxide (the more common exhaust gas measures) were nothing unexpected (much more for the car).
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