Question

which element is present in the exhaust of automobiles
exept carbon monooxide​

Answer 1

Composition. The largest part of most combustion gas is nitrogen (N2), water vapor (H2O) (except with pure-carbon fuels), and carbon dioxide (CO2) (except for fuels without carbon); these are not toxic or noxious (although water vapor and carbon dioxide are greenhouse gases that contribute to global warming).

Answer 2

$\bf Hey\:There\:!$

Question:

Which element is present in the exhaust of automobiles?

Answer:

Lead

Lead is present in the exhaust of automobiles.

The exhaust also contains carbon monoxide and nitrogen oxides.