Question

which harmful gases emitted by petrol and diesel ​

Answer 1

Answer:

Common pollutants include unburned hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) or particulate matter (PM). Total concentration of pollutants in diesel exhaust gases typically amounts to some tenths of one percent—this is schematically illustrated in Figure 1.

Answer 2

I think Carbon dioxide and Carbon monoxide