But not all of it is invalid: it is still true that there are more
aldehyde emissions according to the book I found, so if you want to control those, a catalytic converter is required.
Not exact matches
Emissions of volatile
aldehydes from heated cooking oils.
According to a book Vehicular Air Pollution I found from Google Books, ethanol fuel actually has some
emissions worse than gasoline: ethanol emits more
aldehydes.
In fact, read my answer to see that some
emissions (
aldehydes) are actually worse for ethanol.